Set port

Create a `kamal` network for the proxy and app containers to run in.
This allows the proxy to refer to the app containers by name.

.github/workflows/ci.yml

@@ -1,10 +1,25 @@
 name: CI
-on: 
+on:
   push:
     branches:
       - main
   pull_request:
 jobs:
+  rubocop:
+    name: RuboCop
+    runs-on: ubuntu-latest
+    env:
+      BUNDLE_ONLY: rubocop
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Setup Ruby and install gems
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 3.3.0
+          bundler-cache: true
+      - name: Run Rubocop
+        run: bundle exec rubocop --parallel
   tests:
     strategy:
       matrix:
@@ -12,17 +27,29 @@ jobs:
           - "2.7"
           - "3.1"
           - "3.2"
+          - "3.3"
         gemfile:
           - Gemfile
+          - gemfiles/ruby_2.7.gemfile
           - gemfiles/rails_edge.gemfile
-        continue-on-error: [false]
+        exclude:
+          - ruby-version: "2.7"
+            gemfile: Gemfile
+          - ruby-version: "2.7"
+            gemfile: gemfiles/rails_edge.gemfile
+          - ruby-version: "3.1"
+            gemfile: gemfiles/ruby_2.7.gemfile
+          - ruby-version: "3.2"
+            gemfile: gemfiles/ruby_2.7.gemfile
+          - ruby-version: "3.3"
+            gemfile: gemfiles/ruby_2.7.gemfile
     name: ${{ format('Tests (Ruby {0})', matrix.ruby-version) }}
     runs-on: ubuntu-latest
-    continue-on-error: ${{ matrix.continue-on-error }}
+    continue-on-error: true
     env:
       BUNDLE_GEMFILE: ${{ github.workspace }}/${{ matrix.gemfile }}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Install Ruby
         uses: ruby/setup-ruby@v1

.github/workflows/docker-publish.yml

@@ -1,6 +1,12 @@
 name: Docker
 
 on:
+  workflow_dispatch:
+    inputs:
+      tagInput:
+        description: 'Tag'
+        required: true
+    
   release:
     types: [created]
     tags:
@@ -29,6 +35,14 @@ jobs:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Determine version tag
+        id: version-tag
+        run: |
+          INPUT_VALUE="${{ github.event.inputs.tagInput }}"
+          if [ -z "$INPUT_VALUE" ]; then
+            INPUT_VALUE="${{ github.ref_name }}"
+          fi
+          echo "::set-output name=value::$INPUT_VALUE"
       -
         name: Build and push
         uses: docker/build-push-action@v3
@@ -37,5 +51,5 @@ jobs:
           platforms: linux/amd64,linux/arm64
           push: true
           tags: |
-            ghcr.io/mrsked/mrsk:latest
+            ghcr.io/basecamp/kamal:latest
-            ghcr.io/mrsked/mrsk:${{ github.ref_name }}
+            ghcr.io/basecamp/kamal:${{ steps.version-tag.outputs.value }}

.rubocop.yml

@@ -0,0 +1,2 @@
+inherit_gem:
+  rubocop-rails-omakase: rubocop.yml

CODE_OF_CONDUCT.md

@@ -1,10 +1,10 @@
 # Contributor Code of Conduct
 
-As contributors and maintainers of the MRSK project, we pledge to create a welcoming and inclusive environment for everyone. We value the participation of each member of our community and want all contributors to feel respected and valued.
+As contributors and maintainers of the Kamal project, we pledge to create a welcoming and inclusive environment for everyone. We value the participation of each member of our community and want all contributors to feel respected and valued.
 
 We are committed to providing a harassment-free experience for everyone, regardless of gender, gender identity and expression, sexual orientation, disability, physical appearance, body size, race, age, or religion (or lack thereof). We do not tolerate harassment of participants in any form.
 
-This code of conduct applies to all MRSK project spaces, including but not limited to project code, issue trackers, chat rooms, and mailing lists. Violations of this code of conduct may result in removal from the project community.
+This code of conduct applies to all Kamal project spaces, including but not limited to project code, issue trackers, chat rooms, and mailing lists. Violations of this code of conduct may result in removal from the project community.
 
 ## Our standards
 

CONTRIBUTING.md

@@ -1,18 +1,18 @@
-# Contributing to MRSK development
+# Contributing to Kamal development
 
-Thank you for considering contributing to MRSK! This document outlines some guidelines for contributing to this open source project.
+Thank you for considering contributing to Kamal! This document outlines some guidelines for contributing to this open source project.
 
-Please make sure to review our [Code of Conduct](CODE_OF_CONDUCT.md) before contributing to MRSK.
+Please make sure to review our [Code of Conduct](CODE_OF_CONDUCT.md) before contributing to Kamal.
 
 There are several ways you can contribute to the betterment of the project:
 
-- **Report an issue?** - If the issue isn’t reported, we can’t fix it. Please report any bugs, feature, and/or improvement requests on the [MRSK GitHub Issues tracker](https://github.com/mrsked/mrsk/issues).
+- **Report an issue?** - If the issue isn’t reported, we can’t fix it. Please report any bugs, feature, and/or improvement requests on the [Kamal GitHub Issues tracker](https://github.com/basecamp/kamal/issues).
-- **Submit patches** - Do you have a new feature or a fix you'd like to share? [Submit a pull request](https://github.com/mrsked/mrsk/pulls)!
+- **Submit patches** - Do you have a new feature or a fix you'd like to share? [Submit a pull request](https://github.com/basecamp/kamal/pulls)!
-- **Write blog articles** - Are you using MRSK? We'd love to hear how you're using it with your projects. Write a tutorial and post it on your blog!
+- **Write blog articles** - Are you using Kamal? We'd love to hear how you're using it with your projects. Write a tutorial and post it on your blog!
 
 ## Issues
 
-If you encounter any issues with the project, please check the [existing issues](https://github.com/mrsked/mrsk/issues) first to see if the issue has already been reported. If the issue hasn't been reported, please open a new issue with a clear description of the problem and steps to reproduce it.
+If you encounter any issues with the project, please check the [existing issues](https://github.com/basecamp/kamal/issues) first to see if the issue has already been reported. If the issue hasn't been reported, please open a new issue with a clear description of the problem and steps to reproduce it.
 
 ## Pull Requests
 
@@ -27,23 +27,23 @@ Please keep the following guidelines in mind when opening a pull request:
 - Add tests for your changes, if possible.
 - Ensure that your changes don't break existing functionality.
 
-#### Commit message guidline
+#### Commit message guidelines
 
 A good commit message should describe what changed and why.
 
 ## Development
 
-The `main` branch is regularly built and tested, but it is not guaranteed to be completely stable. Tags are created regularly from release branches to indicate new official, stable release versions of MRSK.
+The `main` branch is regularly built and tested, but it is not guaranteed to be completely stable. Tags are created regularly from release branches to indicate new official, stable release versions of Kamal.
 
-MRSK is written in Ruby. You should have Ruby 3.2+ installed on your machine in order to work on MRSK. If that's already setup, run `bundle` in the root directory to install all dependencies. Then you can run `bin/test` to run all tests.
+Kamal is written in Ruby. You should have Ruby 3.2+ installed on your machine in order to work on Kamal. If that's already setup, run `bundle` in the root directory to install all dependencies. Then you can run `bin/test` to run all tests.
 
 1. Fork the project repository.
 2. Create a new branch for your contribution.
 3. Write your code or make the desired changes.
 4. **Ensure that your code passes the project's minitests by running ./bin/test.**
 5. Commit your changes and push them to your forked repository.
-6. [Open a pull request](https://github.com/mrsked/mrsk/pulls) to the main project repository with a detailed description of your changes.
+6. [Open a pull request](https://github.com/basecamp/kamal/pulls) to the main project repository with a detailed description of your changes.
 
 ## License
 
-MRSK is released under the MIT License. By contributing to this project, you agree to license your contributions under the same license.
+Kamal is released under the MIT License. By contributing to this project, you agree to license your contributions under the same license.

Dockerfile

@@ -4,14 +4,14 @@ FROM ruby:3.2.0-alpine
 # Install  docker/buildx-bin
 COPY --from=docker/buildx-bin /buildx /usr/libexec/docker/cli-plugins/docker-buildx
 
-# Set the working directory to /mrsk
+# Set the working directory to /kamal
-WORKDIR /mrsk
+WORKDIR /kamal
 
 # Copy the Gemfile, Gemfile.lock into the container
-COPY Gemfile Gemfile.lock mrsk.gemspec ./
+COPY Gemfile Gemfile.lock kamal.gemspec ./
 
-# Required in mrsk.gemspec
+# Required in kamal.gemspec
-COPY lib/mrsk/version.rb /mrsk/lib/mrsk/version.rb
+COPY lib/kamal/version.rb /kamal/lib/kamal/version.rb
 
 # Install system dependencies
 RUN apk add --no-cache --update build-base git docker openrc openssh-client-default \
@@ -21,12 +21,12 @@ RUN apk add --no-cache --update build-base git docker openrc openssh-client-defa
 
 # Copy the rest of our application code into the container.
 # We do this after bundle install, to avoid having to run bundle
-# everytime we do small fixes in the source code.
+# every time we do small fixes in the source code.
 COPY . .
 
 # Install the gem locally from the project folder
-RUN gem build mrsk.gemspec && \
+RUN gem build kamal.gemspec && \
-    gem install ./mrsk-*.gem --no-document
+    gem install ./kamal-*.gem --no-document
 
 # Set the working directory to /workdir
 WORKDIR /workdir
@@ -36,5 +36,5 @@ WORKDIR /workdir
 RUN git config --global --add safe.directory /workdir
 
 # Set the entrypoint to run the installed binary in /workdir
-# Example:  docker run -it -v "$PWD:/workdir" mrsk init
+# Example:  docker run -it -v "$PWD:/workdir" kamal init
-ENTRYPOINT ["mrsk"]
+ENTRYPOINT ["kamal"]

Gemfile

@@ -1,4 +1,8 @@
-source 'https://rubygems.org'
+source "https://rubygems.org"
 git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
 gemspec
+
+group :rubocop do
+  gem "rubocop-rails-omakase", require: false
+end

Gemfile.lock

@@ -1,9 +1,11 @@
 PATH
   remote: .
   specs:
-    mrsk (0.13.0)
+    kamal (1.4.0)
       activesupport (>= 7.0)
+      base64 (~> 0.2)
       bcrypt_pbkdf (~> 1.0)
+      concurrent-ruby (~> 1.2)
       dotenv (~> 2.8)
       ed25519 (~> 1.2)
       net-ssh (~> 7.0)
@@ -14,82 +16,152 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    actionpack (7.0.4.3)
+    actionpack (7.1.2)
-      actionview (= 7.0.4.3)
+      actionview (= 7.1.2)
-      activesupport (= 7.0.4.3)
+      activesupport (= 7.1.2)
-      rack (~> 2.0, >= 2.2.0)
+      nokogiri (>= 1.8.5)
+      racc
+      rack (>= 2.2.4)
+      rack-session (>= 1.0.1)
       rack-test (>= 0.6.3)
-      rails-dom-testing (~> 2.0)
+      rails-dom-testing (~> 2.2)
-      rails-html-sanitizer (~> 1.0, >= 1.2.0)
+      rails-html-sanitizer (~> 1.6)
-    actionview (7.0.4.3)
+    actionview (7.1.2)
-      activesupport (= 7.0.4.3)
+      activesupport (= 7.1.2)
       builder (~> 3.1)
-      erubi (~> 1.4)
+      erubi (~> 1.11)
-      rails-dom-testing (~> 2.0)
+      rails-dom-testing (~> 2.2)
-      rails-html-sanitizer (~> 1.1, >= 1.2.0)
+      rails-html-sanitizer (~> 1.6)
-    activesupport (7.0.4.3)
+    activesupport (7.1.2)
+      base64
+      bigdecimal
       concurrent-ruby (~> 1.0, >= 1.0.2)
+      connection_pool (>= 2.2.5)
+      drb
       i18n (>= 1.6, < 2)
       minitest (>= 5.1)
+      mutex_m
       tzinfo (~> 2.0)
+    ast (2.4.2)
+    base64 (0.2.0)
     bcrypt_pbkdf (1.1.0)
+    bigdecimal (3.1.5)
     builder (3.2.4)
     concurrent-ruby (1.2.2)
+    connection_pool (2.4.1)
     crass (1.0.6)
-    debug (1.7.2)
+    debug (1.9.1)
-      irb (>= 1.5.0)
+      irb (~> 1.10)
-      reline (>= 0.3.1)
+      reline (>= 0.3.8)
     dotenv (2.8.1)
+    drb (2.2.0)
+      ruby2_keywords
     ed25519 (1.3.0)
     erubi (1.12.0)
-    i18n (1.12.0)
+    i18n (1.14.1)
       concurrent-ruby (~> 1.0)
-    io-console (0.6.0)
+    io-console (0.7.1)
-    irb (1.6.3)
+    irb (1.11.0)
-      reline (>= 0.3.0)
+      rdoc
-    loofah (2.20.0)
+      reline (>= 0.3.8)
+    json (2.7.1)
+    language_server-protocol (3.17.0.3)
+    loofah (2.22.0)
       crass (~> 1.0.2)
-      nokogiri (>= 1.5.9)
+      nokogiri (>= 1.12.0)
-    method_source (1.0.0)
+    minitest (5.20.0)
-    minitest (5.18.0)
+    mocha (2.1.0)
-    mocha (2.0.2)
       ruby2_keywords (>= 0.0.5)
+    mutex_m (0.2.0)
     net-scp (4.0.0)
       net-ssh (>= 2.6.5, < 8.0.0)
-    net-ssh (7.1.0)
+    net-ssh (7.2.1)
-    nokogiri (1.14.2-arm64-darwin)
+    nokogiri (1.16.0-arm64-darwin)
       racc (~> 1.4)
-    nokogiri (1.14.2-x86_64-darwin)
+    nokogiri (1.16.0-x86_64-darwin)
       racc (~> 1.4)
-    nokogiri (1.14.2-x86_64-linux)
+    nokogiri (1.16.0-x86_64-linux)
       racc (~> 1.4)
-    racc (1.6.2)
+    parallel (1.24.0)
-    rack (2.2.6.4)
+    parser (3.3.0.5)
+      ast (~> 2.4.1)
+      racc
+    psych (5.1.2)
+      stringio
+    racc (1.7.3)
+    rack (3.0.8)
+    rack-session (2.0.0)
+      rack (>= 3.0.0)
     rack-test (2.1.0)
       rack (>= 1.3)
-    rails-dom-testing (2.0.3)
+    rackup (2.1.0)
-      activesupport (>= 4.2.0)
+      rack (>= 3)
+      webrick (~> 1.8)
+    rails-dom-testing (2.2.0)
+      activesupport (>= 5.0.0)
+      minitest
       nokogiri (>= 1.6)
-    rails-html-sanitizer (1.5.0)
+    rails-html-sanitizer (1.6.0)
-      loofah (~> 2.19, >= 2.19.1)
+      loofah (~> 2.21)
-    railties (7.0.4.3)
+      nokogiri (~> 1.14)
-      actionpack (= 7.0.4.3)
+    railties (7.1.2)
-      activesupport (= 7.0.4.3)
+      actionpack (= 7.1.2)
-      method_source
+      activesupport (= 7.1.2)
+      irb
+      rackup (>= 1.0.0)
       rake (>= 12.2)
-      thor (~> 1.0)
+      thor (~> 1.0, >= 1.2.2)
-      zeitwerk (~> 2.5)
+      zeitwerk (~> 2.6)
-    rake (13.0.6)
+    rainbow (3.1.1)
-    reline (0.3.3)
+    rake (13.1.0)
+    rdoc (6.6.2)
+      psych (>= 4.0.0)
+    regexp_parser (2.9.0)
+    reline (0.4.2)
       io-console (~> 0.5)
+    rexml (3.2.6)
+    rubocop (1.62.1)
+      json (~> 2.3)
+      language_server-protocol (>= 3.17.0)
+      parallel (~> 1.10)
+      parser (>= 3.3.0.2)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml (>= 3.2.5, < 4.0)
+      rubocop-ast (>= 1.31.1, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 2.4.0, < 3.0)
+    rubocop-ast (1.31.2)
+      parser (>= 3.3.0.4)
+    rubocop-minitest (0.35.0)
+      rubocop (>= 1.61, < 2.0)
+      rubocop-ast (>= 1.31.1, < 2.0)
+    rubocop-performance (1.20.2)
+      rubocop (>= 1.48.1, < 2.0)
+      rubocop-ast (>= 1.30.0, < 2.0)
+    rubocop-rails (2.24.0)
+      activesupport (>= 4.2.0)
+      rack (>= 1.1)
+      rubocop (>= 1.33.0, < 2.0)
+      rubocop-ast (>= 1.31.1, < 2.0)
+    rubocop-rails-omakase (1.0.0)
+      rubocop
+      rubocop-minitest
+      rubocop-performance
+      rubocop-rails
+    ruby-progressbar (1.13.0)
     ruby2_keywords (0.0.5)
-    sshkit (1.21.4)
+    sshkit (1.21.7)
+      mutex_m
       net-scp (>= 1.1.2)
       net-ssh (>= 2.8.0)
-    thor (1.2.1)
+    stringio (3.1.0)
+    thor (1.3.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
-    zeitwerk (2.6.7)
+    unicode-display_width (2.5.0)
+    webrick (1.8.1)
+    zeitwerk (2.6.12)
 
 PLATFORMS
   arm64-darwin
@@ -98,9 +170,10 @@ PLATFORMS
 
 DEPENDENCIES
   debug
+  kamal!
   mocha
-  mrsk!
   railties
+  rubocop-rails-omakase
 
 BUNDLED WITH
    2.4.3

README.md

@@ -1,924 +1,13 @@
-# MRSK
+# Kamal: Deploy web apps anywhere
 
-MRSK deploys web apps anywhere from bare metal to cloud VMs using Docker with zero downtime. It uses the dynamic reverse-proxy Traefik to hold requests while the new application container is started and the old one is stopped. It works seamlessly across multiple hosts, using SSHKit to execute commands. It was built for Rails applications, but works with any type of web app that can be containerized with Docker.
+From bare metal to cloud VMs, deploy web apps anywhere with zero downtime. Kamal uses mproxy for zero-downtime deployments. Works seamlessly across multiple hosts, using SSHKit to execute commands. Originally built for Rails apps, Kamal will work with any type of web app that can be containerized with Docker.
 
-Watch the screencast: https://www.youtube.com/watch?v=LL1cV2FXZ5I
+➡️ See [kamal-deploy.org](https://kamal-deploy.org) for documentation on [installation](https://kamal-deploy.org/docs/installation), [configuration](https://kamal-deploy.org/docs/configuration), and [commands](https://kamal-deploy.org/docs/commands).
 
-Join us on Discord: https://discord.gg/YgHVT7GCXS
+## Contributing to the documentation
 
-Ask questions: https://github.com/mrsked/mrsk/discussions
+Please help us improve Kamal's documentation on the [the basecamp/kamal-site repository](https://github.com/basecamp/kamal-site).
-
-## Installation
-
-If you have a Ruby environment available, you can install MRSK globally with:
-
-```sh
-gem install mrsk
-```
-
-...otherwise, you can run a dockerized version via an alias (add this to your .bashrc or similar to simplify re-use):
-
-```sh
-alias mrsk='docker run --rm -it -v $HOME/.ssh:/root/.ssh -v /var/run/docker.sock:/var/run/docker.sock -v ${PWD}/:/workdir  ghcr.io/mrsked/mrsk'
-```
-
-Then, inside your app directory, run `mrsk init` (or `mrsk init --bundle` within Rails 7+ apps where you want a bin/mrsk binstub). Now edit the new file `config/deploy.yml`. It could look as simple as this:
-
-```yaml
-service: hey
-image: 37s/hey
-servers:
-  - 192.168.0.1
-  - 192.168.0.2
-registry:
-  username: registry-user-name
-  password:
-    - MRSK_REGISTRY_PASSWORD
-env:
-  secret:
-    - RAILS_MASTER_KEY
-```
-
-Then edit your `.env` file to add your registry password as `MRSK_REGISTRY_PASSWORD` (and your `RAILS_MASTER_KEY` for production with a Rails app).
-
-Now you're ready to deploy to the servers:
-
-```
-mrsk setup
-```
-
-This will:
-
-1. Connect to the servers over SSH (using root by default, authenticated by your ssh key)
-2. Install Docker and curl on any server that might be missing it (using apt-get): root access is needed via ssh for this.
-3. Log into the registry both locally and remotely
-4. Build the image using the standard Dockerfile in the root of the application.
-5. Push the image to the registry.
-6. Pull the image from the registry onto the servers.
-7. Ensure Traefik is running and accepting traffic on port 80.
-8. Ensure your app responds with `200 OK` to `GET /up` (you must have curl installed inside your app image!).
-9. Start a new container with the version of the app that matches the current git version hash.
-10. Stop the old container running the previous version of the app.
-11. Prune unused images and stopped containers to ensure servers don't fill up.
-
-Voila! All the servers are now serving the app on port 80. If you're just running a single server, you're ready to go. If you're running multiple servers, you need to put a load balancer in front of them. For subsequent deploys, or if your servers already have Docker and curl installed, you can just run `mrsk deploy`.
-
-## Vision
-
-In the past decade+, there's been an explosion in commercial offerings that make deploying web apps easier. Heroku kicked it off with an incredible offering that stayed ahead of the competition seemingly forever. These days we have excellent alternatives like Fly.io and Render. And hosted Kubernetes is making things easier too on AWS, GCP, Digital Ocean, and elsewhere. But these are all offerings that have you renting computers in the cloud at a premium. If you want to run on your own hardware, or even just have a clear migration path to do so in the future, you need to carefully consider how locked in you get to these commercial platforms. Preferably before the bills swallow your business whole!
-
-MRSK seeks to bring the advance in ergonomics pioneered by these commercial offerings to deploying web apps anywhere. Whether that's low-cost cloud options without the managed-service markup from the likes of Digital Ocean, Hetzner, OVH, etc, or it's your own colocated bare metal. To MRSK, it's all the same. Feed the config file a list of IP addresses with vanilla Ubuntu servers that have seen no prep beyond an added SSH key, and you'll be running in literally minutes.
-
-This approach gives you enormous portability. You can have your web app deployed on several clouds at ease like this. Or you can buy the baseline with your own hardware, then deploy to a cloud before a big seasonal spike to get more capacity. When you're not locked into a single provider from a tooling perspective, there are a lot of compelling options available.
-
-Ultimately, MRSK is meant to compress the complexity of going to production using open source tooling that isn't tied to any commercial offering. Not to zero, mind you. You're probably still better off with a fully managed service if basic Linux or Docker is still difficult, but as soon as those concepts are familiar, you'll be ready to go with MRSK.
-
-## Why not just run Capistrano, Kubernetes or Docker Swarm?
-
-MRSK basically is Capistrano for Containers, without the need to carefully prepare servers in advance. No need to ensure that the servers have just the right version of Ruby or other dependencies you need. That all lives in the Docker image now. You can boot a brand new Ubuntu (or whatever) server, add it to the list of servers in MRSK, and it'll be auto-provisioned with Docker, and run right away. Docker's layer caching also speeds up deployments with less mucking about on the server. And the images built for MRSK can be used for CI or later introspection.
-
-Kubernetes is a beast. Running it yourself on your own hardware is not for the faint of heart. It's a fine option if you want to run on someone else's platform, either transparently [like Render](https://thenewstack.io/render-cloud-deployment-with-less-engineering/) or explicitly on AWS/GCP, but if you'd like the freedom to move between cloud and your own hardware, or even mix the two, MRSK is much simpler. You can see everything that's going on, it's just basic Docker commands being called.
-
-Docker Swarm is much simpler than Kubernetes, but it's still built on the same declarative model that uses state reconciliation. MRSK is intentionally designed around imperative commands, like Capistrano.
-
-Ultimately, there are a myriad of ways to deploy web apps, but this is the toolkit we're using at [37signals](https://37signals.com) to bring [HEY](https://www.hey.com) [home from the cloud](https://world.hey.com/dhh/why-we-re-leaving-the-cloud-654b47e0) without losing the advantages of modern containerization tooling.
-
-## Running MRSK from Docker
-
-MRSK is packaged up in a Docker container similarly to [rails/docked](https://github.com/rails/docked). This will allow you to run MRSK (from your application directory) without having to install any dependencies other than Docker. Add the following alias to your profile configuration to make working with the container more convenient:
-
-```bash
-alias mrsk="docker run -it --rm -v '${PWD}:/workdir' -v '${SSH_AUTH_SOCK}:/ssh-agent' -v /var/run/docker.sock:/var/run/docker.sock -e 'SSH_AUTH_SOCK=/ssh-agent' ghcr.io/mrsked/mrsk:latest"
-```
-
-Since MRSK uses SSH to establish a remote connection, it will need access to your SSH agent. The above command uses a volume mount to make it available inside the container and configures the SSH agent inside the container to make use of it.
-
-## Configuration
-
-### Using .env file to load required environment variables
-
-MRSK uses [dotenv](https://github.com/bkeepers/dotenv) to automatically load environment variables set in the `.env` file present in the application root. This file can be used to set variables like `MRSK_REGISTRY_PASSWORD` or database passwords. But for this reason you must ensure that .env files are not checked into Git or included in your Dockerfile! The format is just key-value like:
-
-```bash
-MRSK_REGISTRY_PASSWORD=pw
-DB_PASSWORD=secret123
-```
-
-### Using a generated .env file
-
-#### 1Password as a secret store
-
-If you're using a centralized secret store, like 1Password, you can create `.env.erb` as a template which looks up the secrets. Example of a .env.erb file:
-
-```erb
-<% if (session_token = `op signin --account my-one-password-account --raw`.strip) != "" %># Generated by mrsk envify
-GITHUB_TOKEN=<%= `gh config get -h github.com oauth_token`.strip %>
-MRSK_REGISTRY_PASSWORD=<%= `op read "op://Vault/Docker Hub/password" -n --session  #{session_token}` %>
-RAILS_MASTER_KEY=<%= `op read "op://Vault/My App/RAILS_MASTER_SECRET" -n --session #{session_token}` %>
-MYSQL_ROOT_PASSWORD=<%= `op read "op://Vault/My App/MYSQL_ROOT_PASSWORD" -n --session #{session_token}` %>
-<% else raise ArgumentError, "Session token missing" end %>
-```
-
-This template can safely be checked into git. Then everyone deploying the app can run `mrsk envify` when they setup the app for the first time or passwords change to get the correct `.env` file.
-
-If you need separate env variables for different destinations, you can set them with `.env.destination.erb` for the template, which will generate `.env.staging` when run with `mrsk envify -d staging`.
-
-#### Bitwarden as a secret store
-
-If you are using open source secret store like bitwarden, you can create `.env.erb` as a template which looks up the secrets.
-
-You can store `SOME_SECRET` in a secure note in bitwarden vault.
-
-```
-$ bw list items --search SOME_SECRET | jq
-? Master password: [hidden]
-
-[
-  {
-    "object": "item",
-    "id": "123123123-1232-4224-222f-234234234234",
-    "organizationId": null,
-    "folderId": null,
-    "type": 2,
-    "reprompt": 0,
-    "name": "SOME_SECRET",
-    "notes": "yyy",
-    "favorite": false,
-    "secureNote": {
-      "type": 0
-    },
-    "collectionIds": [],
-    "revisionDate": "2023-02-28T23:54:47.868Z",
-    "creationDate": "2022-11-07T03:16:05.828Z",
-    "deletedDate": null
-  }
-]
-```
-
-and extract the `id` of `SOME_SECRET` from the `json` above and use in the `erb` below.
-
-
-Example `.env.erb` file:
-
-```erb
-<% if (session_token=`bw unlock --raw`.strip) != "" %># Generated by mrsk envify
-SOME_SECRET=<%= `bw get notes 123123123-1232-4224-222f-234234234234 --session #{session_token}` %>
-<% else raise ArgumentError, "session_token token missing" end %>
-```
-
-Then everyone deploying the app can run `mrsk envify` and mrsk will generate `.env`
-
-
-### Using another registry than Docker Hub
-
-The default registry is Docker Hub, but you can change it using `registry/server`:
-
-```yaml
-registry:
-  server: registry.digitalocean.com
-  username:
-    - DOCKER_REGISTRY_TOKEN
-  password:
-    - DOCKER_REGISTRY_TOKEN
-```
-
-A reference to secret `DOCKER_REGISTRY_TOKEN` will look for `ENV["DOCKER_REGISTRY_TOKEN"]` on the machine running MRSK.
-
-#### Using AWS ECR as the container registry
-
-AWS ECR's access token is only valid for 12hrs. In order to not have to manually regenerate the token every time, you can use ERB in the `deploy.yml` file to shell out to the `aws` cli command, and obtain the token:
-
-```yaml
-registry:
-  server: <your aws account id>.dkr.ecr.<your aws region id>.amazonaws.com
-  username: AWS
-  password: <%= %x(aws ecr get-login-password) %>
-```
-
-You will need to have the `aws` CLI installed locally for this to work.
-
-### Using a different SSH user than root
-
-The default SSH user is root, but you can change it using `ssh/user`:
-
-```yaml
-ssh:
-  user: app
-```
-
-If you are using non-root user, you need to bootstrap your servers manually, before using them with MRSK. On Ubuntu, you'd do:
-
-```bash
-sudo apt update
-sudo apt upgrade -y
-sudo apt install -y docker.io curl git
-sudo usermod -a -G docker ubuntu
-```
-
-### Using a proxy SSH host
-
-If you need to connect to server through a proxy host, you can use `ssh/proxy`:
-
-```yaml
-ssh:
-  proxy: "192.168.0.1" # defaults to root as the user
-```
-
-Or with specific user:
-
-```yaml
-ssh:
-  proxy: "app@192.168.0.1"
-```
-
-Also if you need specific proxy command to connect to the server:
-
-```yaml
-ssh:
-  proxy_command: aws ssm start-session --target %h --document-name AWS-StartSSHSession --parameters 'portNumber=%p' --region=us-east-1 ## ssh via aws ssm
-```
-
-### Using env variables
-
-You can inject env variables into the app containers using `env`:
-
-```yaml
-env:
-  DATABASE_URL: mysql2://db1/hey_production/
-  REDIS_URL: redis://redis1:6379/1
-```
-
-### Using secret env variables
-
-If you have env variables that are secret, you can divide the `env` block into `clear` and `secret`:
-
-```yaml
-env:
-  clear:
-    DATABASE_URL: mysql2://db1/hey_production/
-    REDIS_URL: redis://redis1:6379/1
-  secret:
-    - DATABASE_PASSWORD
-    - REDIS_PASSWORD
-```
-
-The list of secret env variables will be expanded at run time from your local machine. So a reference to a secret `DATABASE_PASSWORD` will look for `ENV["DATABASE_PASSWORD"]` on the machine running MRSK. Just like with build secrets.
-
-If the referenced secret ENVs are missing, the configuration will be halted with a `KeyError` exception.
-
-Note: Marking an ENV as secret currently only redacts its value in the output for MRSK. The ENV is still injected in the clear into the container at runtime.
-
-### Using volumes
-
-You can add custom volumes into the app containers using `volumes`:
-
-```yaml
-volumes:
-  - "/local/path:/container/path"
-```
-
-### MRSK env variables
-
-The following env variables are set when your container runs:
-
-`MRSK_CONTAINER_NAME` : this contains the current container name and version
-
-### Using different roles for servers
-
-If your application uses separate hosts for running jobs or other roles beyond the default web running, you can specify these hosts in a dedicated role with a new entrypoint command like so:
-
-```yaml
-servers:
-  web:
-    - 192.168.0.1
-    - 192.168.0.2
-  job:
-    hosts:
-      - 192.168.0.3
-      - 192.168.0.4
-    cmd: bin/jobs
-```
-
-Note: Traefik will only by default be installed and run on the servers in the `web` role (and on all servers if no roles are defined). If you need Traefik on hosts in other roles than `web`, add `traefik: true`:
-
-```yaml
-servers:
-  web:
-    - 192.168.0.1
-    - 192.168.0.2
-  web2:
-    traefik: true
-    hosts:
-      - 192.168.0.3
-      - 192.168.0.4
-```
-
-### Using container labels
-
-You can specialize the default Traefik rules by setting labels on the containers that are being started:
-
-```yaml
-labels:
-  traefik.http.routers.hey-web.rule: Host(`app.hey.com`)
-```
-Traefik rules are in the "service-role-destination" format. The default role will be `web` if no rule is specified. If the destination is not specified, it is not included. To give an example, the above rule would become "traefik.http.routers.hey-web-staging.rule" if it was for the "staging" destination.
-
-Note: The backticks are needed to ensure the rule is passed in correctly and not treated as command substitution by Bash!
-
-This allows you to run multiple applications on the same server sharing the same Traefik instance and port.
-See https://doc.traefik.io/traefik/routing/routers/#rule for a full list of available routing rules.
-
-The labels can also be applied on a per-role basis:
-
-```yaml
-servers:
-  web:
-    - 192.168.0.1
-    - 192.168.0.2
-  job:
-    hosts:
-      - 192.168.0.3
-      - 192.168.0.4
-    cmd: bin/jobs
-    labels:
-      my-label: "50"
-```
-
-### Using shell expansion
-
-You can use shell expansion to interpolate values from the host machine into labels and env variables with the `${}` syntax.
-Anything within the curly braces will be executed on the host machine and the result will be interpolated into the label or env variable.
-
-```yaml
-labels:
-  host-machine: "${cat /etc/hostname}"
-
-env:
-  HOST_DEPLOYMENT_DIR: "${PWD}"
-```
-
-Note: Any other occurrence of `$` will be escaped to prevent unwanted shell expansion!
-
-### Using container options
-
-You can specialize the options used to start containers using the `options` definitions:
-
-```yaml
-servers:
-  web:
-    - 192.168.0.1
-    - 192.168.0.2
-  job:
-    hosts:
-      - 192.168.0.3
-      - 192.168.0.4
-    cmd: bin/jobs
-    options:
-      cap-add: true
-      cpu-count: 4
-```
-
-That'll start the job containers with `docker run ... --cap-add --cpu-count 4 ...`.
-
-### Configuring logging
-
-You can configure the logging driver and options passed to Docker using `logging`:
-
-```yaml
-logging:
-  driver: awslogs
-  options:
-    awslogs-region: "eu-central-2"
-    awslogs-group: "my-app"
-```
-
-If nothing is configured, the default option `max-size=10m` is used for all containers. The default logging driver of Docker is `json-file`.
-
-### Using a different stop wait time
-
-On a new deploy, each old running container is gracefully shut down with a `SIGTERM`, and after a grace period of `10` seconds a `SIGKILL` is sent.
-You can configure this value via the `stop_wait_time` option:
-
-```yaml
-stop_wait_time: 30
-```
-
-### Using remote builder for native multi-arch
-
-If you're developing on ARM64 (like Apple Silicon), but you want to deploy on AMD64 (x86 64-bit), you can use multi-architecture images. By default, MRSK will setup a local buildx configuration that does this through QEMU emulation. But this can be quite slow, especially on the first build.
-
-If you want to speed up this process by using a remote AMD64 host to natively build the AMD64 part of the image, while natively building the ARM64 part locally, you can do so using builder options:
-
-```yaml
-builder:
-  local:
-    arch: arm64
-    host: unix:///Users/<%= `whoami`.strip %>/.docker/run/docker.sock
-  remote:
-    arch: amd64
-    host: ssh://root@192.168.0.1
-```
-
-Note: You must have Docker running on the remote host being used as a builder. This instance should only be shared for builds using the same registry and credentials.
-
-### Using remote builder for single-arch
-
-If you're developing on ARM64 (like Apple Silicon), want to deploy on AMD64 (x86 64-bit), but don't need to run the image locally (or on other ARM64 hosts), you can configure a remote builder that just targets AMD64. This is a bit faster than building with multi-arch, as there's nothing to build locally.
-
-```yaml
-builder:
-  remote:
-    arch: amd64
-    host: ssh://root@192.168.0.1
-```
-
-### Using native builder when multi-arch isn't needed
-
-If you're developing on the same architecture as the one you're deploying on, you can speed up the build by forgoing both multi-arch and remote building:
-
-```yaml
-builder:
-  multiarch: false
-```
-
-This is also a good option if you're running MRSK from a CI server that shares architecture with the deployment servers.
-
-### Using a different Dockerfile or context when building
-
-If you need to pass a different Dockerfile or context to the build command (e.g. if you're using a monorepo or you have
-different Dockerfiles), you can do so in the builder options:
-
-```yaml
-# Use a different Dockerfile
-builder:
-  dockerfile: Dockerfile.xyz
-
-# Set context
-builder:
-  context: ".."
-
-# Set Dockerfile and context
-builder:
-  dockerfile: "../Dockerfile.xyz"
-  context: ".."
-```
-
-### Using build secrets for new images
-
-Some images need a secret passed in during build time, like a GITHUB_TOKEN, to give access to private gem repositories. This can be done by having the secret in ENV, then referencing it in the builder configuration:
-
-```yaml
-builder:
-  secrets:
-    - GITHUB_TOKEN
-```
-
-This build secret can then be referenced in the Dockerfile:
-
-```dockerfile
-# Copy Gemfiles
-COPY Gemfile Gemfile.lock ./
-
-# Install dependencies, including private repositories via access token (then remove bundle cache with exposed GITHUB_TOKEN)
-RUN --mount=type=secret,id=GITHUB_TOKEN \
-  BUNDLE_GITHUB__COM=x-access-token:$(cat /run/secrets/GITHUB_TOKEN) \
-  bundle install && \
-  rm -rf /usr/local/bundle/cache
-```
-
-### Traefik command arguments
-
-Customize the Traefik command line using `args`:
-
-```yaml
-traefik:
-  args:
-    accesslog: true
-    accesslog.format: json
-```
-
-This starts the Traefik container with `--accesslog=true --accesslog.format=json` arguments.
-
-### Traefik host port binding
-
-Traefik binds to port 80 by default. Specify an alternative port using `host_port`:
-
-```yaml
-traefik:
-  host_port: 8080
-```
-
-### Traefik version, upgrades, and custom images
-
-MRSK runs the traefik:v2.9 image to track Traefik 2.9.x releases.
-
-To pin Traefik to a specific version or an image published to your registry,
-specify `image`:
-
-```yaml
-traefik:
-  image: traefik:v2.10.0-rc1
-```
-
-This is useful for downgrading Traefik if there's an unexpected breaking
-change in a minor version release, upgrading Traefik to test forthcoming
-releases, or running your own Traefik-derived image.
-
-MRSK has not been tested for compatibility with Traefik 3 betas. Please do!
-
-### Traefik container configuration
-
-Pass additional Docker configuration for the Traefik container using `options`:
-
-```yaml
-traefik:
-  options:
-    publish:
-      - 8080:8080
-    volume:
-      - /tmp/example.json:/tmp/example.json
-    memory: 512m
-```
-
-This starts the Traefik container with `--volume /tmp/example.json:/tmp/example.json --publish 8080:8080 --memory 512m` arguments to `docker run`.
-
-### Traefik container labels
-
-Add labels to Traefik Docker container.
-
-```yaml
-traefik:
-  labels:
-    traefik.enable: true
-    traefik.http.routers.dashboard.rule: Host(`traefik.example.com`) && (PathPrefix(`/api`) || PathPrefix(`/dashboard`))
-    traefik.http.routers.dashboard.service: api@internal
-    traefik.http.routers.dashboard.middlewares: auth
-    traefik.http.middlewares.auth.basicauth.users: test:$2y$05$H2o72tMaO.TwY1wNQUV1K.fhjRgLHRDWohFvUZOJHBEtUXNKrqUKi # test:password
-```
-
-This labels Traefik container with `--label traefik.http.routers.dashboard.middlewares=\"auth\"` and so on.
-
-### Traefik alternate entrypoints
-
-You can configure multiple entrypoints for Traefik like so:
-
-```yaml
-service: myservice
-
-labels:
-  traefik.tcp.routers.other.rule: 'HostSNI(`*`)'
-  traefik.tcp.routers.other.entrypoints: otherentrypoint
-  traefik.tcp.services.other.loadbalancer.server.port: 9000
-  traefik.http.routers.myservice.entrypoints: web
-  traefik.http.services.myservice.loadbalancer.server.port: 8080
-
-traefik:
-  options:
-    publish:
-      - 9000:9000
-  args:
-    entrypoints.web.address: ':80'
-    entrypoints.otherentrypoint.address: ':9000'
-```
-
-### Configuring build args for new images
-
-Build arguments that aren't secret can also be configured:
-
-```yaml
-builder:
-  args:
-    RUBY_VERSION: 3.2.0
-```
-
-This build argument can then be used in the Dockerfile:
-
-```
-ARG RUBY_VERSION
-FROM ruby:$RUBY_VERSION-slim as base
-```
-
-### Using accessories for database, cache, search services
-
-You can manage your accessory services via MRSK as well. Accessories are long-lived services that your app depends on. They are not updated when you deploy.
-
-```yaml
-accessories:
-  mysql:
-    image: mysql:5.7
-    host: 1.1.1.3
-    port: 3306
-    env:
-      clear:
-        MYSQL_ROOT_HOST: '%'
-      secret:
-        - MYSQL_ROOT_PASSWORD
-    volumes:
-      - /var/lib/mysql:/var/lib/mysql
-    options:
-      cpus: 4
-      memory: "2GB"
-  redis:
-    image: redis:latest
-    roles:
-      - web
-    port: "36379:6379"
-    volumes:
-      - /var/lib/redis:/data
-  internal-example:
-    image: registry.digitalocean.com/user/otherservice:latest
-    host: 1.1.1.5
-    port: 44444
-```
-
-The hosts that the accessories will run on can be specified by hosts or roles:
-
-```yaml
-  # Single host
-  mysql:
-    host: 1.1.1.1
-  # Multiple hosts
-  redis:
-    hosts:
-      - 1.1.1.1
-      - 1.1.1.2
-  # By role
-  monitoring:
-    roles:
-      - web
-      - jobs
-```
-
-Now run `mrsk accessory start mysql` to start the MySQL server on 1.1.1.3. See `mrsk accessory` for all the commands possible.
-
-Accessory images must be public or tagged in your private registry.
-
-### Using Cron
-
-You can use a specific container to run your Cron jobs:
-
-```yaml
-servers:
-  cron:
-    hosts:
-      - 192.168.0.1
-    cmd:
-      bash -c "cat config/crontab | crontab - && cron -f"
-```
-
-This assumes the Cron settings are stored in `config/crontab`.
-
-### Healthcheck
-
-MRSK uses Docker healtchecks to check the health of your application during deployment. Traefik uses this same healthcheck status to determine when a container is ready to receive traffic.
-
-The healthcheck defaults to testing the HTTP response to the path `/up` on port 3000, up to 7 times. You can tailor this behaviour with the `healthcheck` setting:
-
-```yaml
-healthcheck:
-  path: /healthz
-  port: 4000
-  max_attempts: 7
-  interval: 20s
-```
-
-This will ensure your application is configured with a traefik label for the healthcheck against `/healthz` and that the pre-deploy healthcheck that MRSK performs is done against the same path on port 4000.
-
-You can also specify a custom healthcheck command, which is useful for non-HTTP services:
-
-```yaml
-healthcheck:
-  cmd: /bin/check_health
-```
-
-The top-level healthcheck configuration applies to all services that use
-Traefik, by default. You can also specialize the configuration at the role
-level:
-
-```yaml
-servers:
-  job:
-    hosts: ...
-    cmd: bin/jobs
-    healthcheck:
-      cmd: bin/check
-```
-
-The healthcheck allows for an optional `max_attempts` setting, which will attempt the healthcheck up to the specified number of times before failing the deploy. This is useful for applications that take a while to start up. The default is 7.
-
-Note: The HTTP health checks assume that the `curl` command is available inside the container. If that's not the case, use the healthcheck's `cmd` option to specify an alternative check that the container supports.
-
-## Commands
-
-### Running commands on servers
-
-You can execute one-off commands on the servers:
-
-```bash
-# Runs command on all servers
-mrsk app exec 'ruby -v'
-App Host: 192.168.0.1
-ruby 3.1.3p185 (2022-11-24 revision 1a6b16756e) [x86_64-linux]
-
-App Host: 192.168.0.2
-ruby 3.1.3p185 (2022-11-24 revision 1a6b16756e) [x86_64-linux]
-
-# Runs command on primary server
-mrsk app exec --primary 'cat .ruby-version'
-App Host: 192.168.0.1
-3.1.3
-
-# Runs Rails command on all servers
-mrsk app exec 'bin/rails about'
-App Host: 192.168.0.1
-About your application's environment
-Rails version             7.1.0.alpha
-Ruby version              ruby 3.1.3p185 (2022-11-24 revision 1a6b16756e) [x86_64-linux]
-RubyGems version          3.3.26
-Rack version              2.2.5
-Middleware                ActionDispatch::HostAuthorization, Rack::Sendfile, ActionDispatch::Static, ActionDispatch::Executor, Rack::Runtime, Rack::MethodOverride, ActionDispatch::RequestId, ActionDispatch::RemoteIp, Rails::Rack::Logger, ActionDispatch::ShowExceptions, ActionDispatch::DebugExceptions, ActionDispatch::Callbacks, ActionDispatch::Cookies, ActionDispatch::Session::CookieStore, ActionDispatch::Flash, ActionDispatch::ContentSecurityPolicy::Middleware, ActionDispatch::PermissionsPolicy::Middleware, Rack::Head, Rack::ConditionalGet, Rack::ETag, Rack::TempfileReaper
-Application root          /rails
-Environment               production
-Database adapter          sqlite3
-Database schema version   20221231233303
-
-App Host: 192.168.0.2
-About your application's environment
-Rails version             7.1.0.alpha
-Ruby version              ruby 3.1.3p185 (2022-11-24 revision 1a6b16756e) [x86_64-linux]
-RubyGems version          3.3.26
-Rack version              2.2.5
-Middleware                ActionDispatch::HostAuthorization, Rack::Sendfile, ActionDispatch::Static, ActionDispatch::Executor, Rack::Runtime, Rack::MethodOverride, ActionDispatch::RequestId, ActionDispatch::RemoteIp, Rails::Rack::Logger, ActionDispatch::ShowExceptions, ActionDispatch::DebugExceptions, ActionDispatch::Callbacks, ActionDispatch::Cookies, ActionDispatch::Session::CookieStore, ActionDispatch::Flash, ActionDispatch::ContentSecurityPolicy::Middleware, ActionDispatch::PermissionsPolicy::Middleware, Rack::Head, Rack::ConditionalGet, Rack::ETag, Rack::TempfileReaper
-Application root          /rails
-Environment               production
-Database adapter          sqlite3
-Database schema version   20221231233303
-
-# Run Rails runner on primary server
-mrsk app exec -p 'bin/rails runner "puts Rails.application.config.time_zone"'
-UTC
-```
-
-### Running interactive commands over SSH
-
-You can run interactive commands, like a Rails console or a bash session, on a server (default is primary, use `--hosts` to connect to another):
-
-```bash
-# Starts a bash session in a new container made from the most recent app image
-mrsk app exec -i bash
-
-# Starts a bash session in the currently running container for the app
-mrsk app exec -i --reuse bash
-
-# Starts a Rails console in a new container made from the most recent app image
-mrsk app exec -i 'bin/rails console'
-```
-
-
-### Running details to show state of containers
-
-You can see the state of your servers by running `mrsk details`:
-
-```
-Traefik Host: 192.168.0.1
-CONTAINER ID   IMAGE     COMMAND                  CREATED          STATUS          PORTS                               NAMES
-6195b2a28c81   traefik   "/entrypoint.sh --pr…"   30 minutes ago   Up 19 minutes   0.0.0.0:80->80/tcp, :::80->80/tcp   traefik
-
-Traefik Host: 192.168.0.2
-CONTAINER ID   IMAGE     COMMAND                  CREATED          STATUS          PORTS                               NAMES
-de14a335d152   traefik   "/entrypoint.sh --pr…"   30 minutes ago   Up 19 minutes   0.0.0.0:80->80/tcp, :::80->80/tcp   traefik
-
-App Host: 192.168.0.1
-CONTAINER ID   IMAGE                                                                         COMMAND                  CREATED          STATUS          PORTS      NAMES
-badb1aa51db3   registry.digitalocean.com/user/app:6ef8a6a84c525b123c5245345a8483f86d05a123   "/rails/bin/docker-e…"   13 minutes ago   Up 13 minutes   3000/tcp   chat-6ef8a6a84c525b123c5245345a8483f86d05a123
-
-App Host: 192.168.0.2
-CONTAINER ID   IMAGE                                                                         COMMAND                  CREATED          STATUS          PORTS      NAMES
-1d3c91ed1f55   registry.digitalocean.com/user/app:6ef8a6a84c525b123c5245345a8483f86d05a123   "/rails/bin/docker-e…"   13 minutes ago   Up 13 minutes   3000/tcp   chat-6ef8a6a84c525b123c5245345a8483f86d05a123
-```
-
-You can also see just info for app containers with `mrsk app details` or just for Traefik with `mrsk traefik details`.
-
-### Running rollback to fix a bad deploy
-
-If you've discovered a bad deploy, you can quickly rollback by reactivating the old, paused container image. You can see what old containers are available for rollback by running `mrsk app containers`. It'll give you a presentation similar to `mrsk app details`, but include all the old containers as well. Showing something like this:
-
-```
-App Host: 192.168.0.1
-CONTAINER ID   IMAGE                                                                         COMMAND                  CREATED          STATUS                      PORTS      NAMES
-1d3c91ed1f51   registry.digitalocean.com/user/app:6ef8a6a84c525b123c5245345a8483f86d05a123   "/rails/bin/docker-e…"   19 minutes ago   Up 19 minutes               3000/tcp   chat-6ef8a6a84c525b123c5245345a8483f86d05a123
-539f26b28369   registry.digitalocean.com/user/app:e5d9d7c2b898289dfbc5f7f1334140d984eedae4   "/rails/bin/docker-e…"   31 minutes ago   Exited (1) 27 minutes ago              chat-e5d9d7c2b898289dfbc5f7f1334140d984eedae4
-
-App Host: 192.168.0.2
-CONTAINER ID   IMAGE                                                                         COMMAND                  CREATED          STATUS                      PORTS      NAMES
-badb1aa51db4   registry.digitalocean.com/user/app:6ef8a6a84c525b123c5245345a8483f86d05a123   "/rails/bin/docker-e…"   19 minutes ago   Up 19 minutes               3000/tcp   chat-6ef8a6a84c525b123c5245345a8483f86d05a123
-6f170d1172ae   registry.digitalocean.com/user/app:e5d9d7c2b898289dfbc5f7f1334140d984eedae4   "/rails/bin/docker-e…"   31 minutes ago   Exited (1) 27 minutes ago              chat-e5d9d7c2b898289dfbc5f7f1334140d984eedae4
-```
-
-From the example above, we can see that `e5d9d7c2b898289dfbc5f7f1334140d984eedae4` was the last version, so it's available as a rollback target. We can perform this rollback by running `mrsk rollback e5d9d7c2b898289dfbc5f7f1334140d984eedae4`. That'll stop `6ef8a6a84c525b123c5245345a8483f86d05a123` and then start `e5d9d7c2b898289dfbc5f7f1334140d984eedae4`. Because the old container is still available, this is very quick. Nothing to download from the registry.
-
-Note that by default old containers are pruned after 3 days when you run `mrsk deploy`.
-
-### Running removal to clean up servers
-
-If you wish to remove the entire application, including Traefik, containers, images, and registry session, you can run `mrsk remove`. This will leave the servers clean.
-
-## Locking
-
-Commands that are unsafe to run concurrently will take a deploy lock while they run. The lock is the `mrsk_lock` directory on the primary server.
-
-You can check the lock status with:
-
-```
-mrsk lock status
-
-Locked by: AN Other at 2023-03-24 09:49:03 UTC
-Version: 77f45c0686811c68989d6576748475a60bf53fc2
-Message: Automatic deploy lock
-```
-
-You can also manually acquire and release the lock
-
-```
-mrsk lock acquire -m "Doing maintanence"
-```
-
-```
-mrsk lock release
-```
-
-## Rolling deployments
-
-When deploying to large numbers of hosts, you might prefer not to restart your services on every host at the same time.
-
-MRSK's default is to boot new containers on all hosts in parallel. But you can control this by configuring `boot/limit` and `boot/wait` as options:
-
-```yaml
-service: myservice
-
-boot:
-  limit: 10 # Can also specify as a percentage of total hosts, such as "25%"
-  wait: 2
-```
-
-When `limit` is specified, containers will be booted on, at most, `limit` hosts at once. MRSK will pause for `wait` seconds between batches.
-
-These settings only apply when booting containers (using `mrsk deploy`, or `mrsk app boot`). For other commands, MRSK continues to run commands in parallel across all hosts.
-
-## Hooks
-
-You can run custom scripts at specific points with hooks.
-
-Hooks should be stored in the .mrsk/hooks folder. Running mrsk init will build that folder and add some sample scripts.
-
-You can change their location by setting `hooks_path` in the configuration file.
-
-If the script returns a non-zero exit code the command will be aborted.
-
-`MRSK_*` environment variables are available to the hooks command for
-fine-grained audit reporting, e.g. for triggering deployment reports or
-firing a JSON webhook. These variables include:
-- `MRSK_RECORDED_AT` - UTC timestamp in ISO 8601 format, e.g. `2023-04-14T17:07:31Z`
-- `MRSK_PERFORMER` - the local user performing the command (from `whoami`)
-- `MRSK_SERVICE_VERSION` - an abbreviated service and version for use in messages, e.g. app@150b24f
-- `MRSK_VERSION` - an full version being deployed
-- `MRSK_DESTINATION` - optional: destination, e.g. "staging"
-- `MRSK_HOSTS` - a comma separated list of the hosts targeted by the command
-- `MRSK_ROLE` - optional: role targeted, e.g. "web"
-
-There are three hooks:
-
-1. pre-connect
-Called before taking the deploy lock. For checks that need to run before connecting to remote hosts - e.g. DNS warming.
-
-2. pre-build
-Used for pre-build checks - e.g. there are no uncommitted changes or that CI has passed.
-
-3. post-deploy - run after a deploy, redeploy or rollback
-
-This hook is also passed a `MRSK_RUNTIME` env variable.
-
-This could be used to broadcast a deployment message, or register the new version with an APM.
-
-The command could look something like:
-
-```bash
-#!/usr/bin/env bash
-curl -q -d content="[My App] ${MRSK_PERFORMER} Rolled back to version ${MRSK_VERSION}" https://3.basecamp.com/XXXXX/integrations/XXXXX/buckets/XXXXX/chats/XXXXX/lines
-```
-
-That'll post a line like follows to a preconfigured chatbot in Basecamp:
-
-```
-[My App] [dhh] Rolled back to version d264c4e92470ad1bd18590f04466787262f605de
-```
-
-Set `--skip_hooks` to avoid running the hooks.
-
-## Stage of development
-
-This is beta software. Commands may still move around. But we're live in production at [37signals](https://37signals.com).
 
 ## License
 
-MRSK is released under the [MIT License](https://opensource.org/licenses/MIT).
+Kamal is released under the [MIT License](https://opensource.org/licenses/MIT).

bin/kamal

@@ -3,10 +3,10 @@
 # Prevent failures from being reported twice.
 Thread.report_on_exception = false
 
-require "mrsk"
+require "kamal"
 
 begin
-  Mrsk::Cli::Main.start(ARGV)
+  Kamal::Cli::Main.start(ARGV)
 rescue SSHKit::Runner::ExecuteError => e
   puts "  \e[31mERROR (#{e.cause.class}): #{e.message}\e[0m"
   puts e.cause.backtrace if ENV["VERBOSE"]

bin/release

@@ -2,13 +2,13 @@
 
 VERSION=$1
 
-printf "module Mrsk\n  VERSION = \"$VERSION\"\nend\n" > ./lib/mrsk/version.rb
+printf "module Kamal\n  VERSION = \"$VERSION\"\nend\n" > ./lib/kamal/version.rb
 bundle
-git add Gemfile.lock lib/mrsk/version.rb
+git add Gemfile.lock lib/kamal/version.rb
 git commit -m "Bump version for $VERSION"
 git push
 git tag v$VERSION
 git push --tags
-gem build mrsk.gemspec
+gem build kamal.gemspec
-gem push "mrsk-$VERSION.gem" --host https://rubygems.org
+gem push "kamal-$VERSION.gem" --host https://rubygems.org
-rm "mrsk-$VERSION.gem"
+rm "kamal-$VERSION.gem"

gemfiles/ruby_2.7.gemfile

@@ -0,0 +1,6 @@
+source 'https://rubygems.org'
+git_source(:github) { |repo| "https://github.com/#{repo}.git" }
+
+gemspec path: "../"
+
+gem "nokogiri", "~> 1.15.0"

kamal.gemspec

@@ -1,16 +1,15 @@
-require_relative "lib/mrsk/version"
+require_relative "lib/kamal/version"
 
 Gem::Specification.new do |spec|
-  spec.name        = "mrsk"
+  spec.name        = "kamal"
-  spec.version     = Mrsk::VERSION
+  spec.version     = Kamal::VERSION
   spec.authors     = [ "David Heinemeier Hansson" ]
   spec.email       = "dhh@hey.com"
-  spec.homepage    = "https://github.com/rails/mrsk"
+  spec.homepage    = "https://github.com/basecamp/kamal"
   spec.summary     = "Deploy web apps in containers to servers running Docker with zero downtime."
   spec.license     = "MIT"
-
   spec.files = Dir["lib/**/*", "MIT-LICENSE", "README.md"]
-  spec.executables = %w[ mrsk ]
+  spec.executables = %w[ kamal ]
 
   spec.add_dependency "activesupport", ">= 7.0"
   spec.add_dependency "sshkit", "~> 1.21"
@@ -20,6 +19,8 @@ Gem::Specification.new do |spec|
   spec.add_dependency "zeitwerk", "~> 2.5"
   spec.add_dependency "ed25519", "~> 1.2"
   spec.add_dependency "bcrypt_pbkdf", "~> 1.0"
+  spec.add_dependency "concurrent-ruby", "~> 1.2"
+  spec.add_dependency "base64", "~> 0.2"
 
   spec.add_development_dependency "debug"
   spec.add_development_dependency "mocha"

lib/kamal.rb

@@ -1,10 +1,10 @@
-module Mrsk
+module Kamal
 end
 
 require "active_support"
 require "zeitwerk"
 
 loader = Zeitwerk::Loader.for_gem
-loader.ignore("#{__dir__}/mrsk/sshkit_with_ext.rb")
+loader.ignore("#{__dir__}/kamal/sshkit_with_ext.rb")
 loader.setup
 loader.eager_load # We need all commands loaded.

lib/kamal/cli.rb

@@ -1,7 +1,7 @@
-module Mrsk::Cli
+module Kamal::Cli
   class LockError < StandardError; end
   class HookError < StandardError; end
 end
 
 # SSHKit uses instance eval, so we need a global const for ergonomics
-MRSK = Mrsk::Commander.new
+KAMAL = Kamal::Commander.new

lib/kamal/cli/accessory.rb

@@ -1,17 +1,17 @@
-class Mrsk::Cli::Accessory < Mrsk::Cli::Base
+class Kamal::Cli::Accessory < Kamal::Cli::Base
   desc "boot [NAME]", "Boot new accessory service on host (use NAME=all to boot all accessories)"
-  def boot(name)
+  def boot(name, login: true)
-    with_lock do
+    mutating do
       if name == "all"
-        MRSK.accessory_names.each { |accessory_name| boot(accessory_name) }
+        KAMAL.accessory_names.each { |accessory_name| boot(accessory_name) }
       else
-        with_accessory(name) do |accessory|
+        with_accessory(name) do |accessory, hosts|
           directories(name)
           upload(name)
 
-          on(accessory.hosts) do
+          on(hosts) do
-            execute *MRSK.registry.login
+            execute *KAMAL.registry.login if login
-            execute *MRSK.auditor.record("Booted #{name} accessory"), verbosity: :debug
+            execute *KAMAL.auditor.record("Booted #{name} accessory"), verbosity: :debug
             execute *accessory.run
           end
         end
@@ -21,9 +21,9 @@ class Mrsk::Cli::Accessory < Mrsk::Cli::Base
 
   desc "upload [NAME]", "Upload accessory files to host", hide: true
   def upload(name)
-    with_lock do
+    mutating do
-      with_accessory(name) do |accessory|
+      with_accessory(name) do |accessory, hosts|
-        on(accessory.hosts) do
+        on(hosts) do
           accessory.files.each do |(local, remote)|
             accessory.ensure_local_file_present(local)
 
@@ -38,9 +38,9 @@ class Mrsk::Cli::Accessory < Mrsk::Cli::Base
 
   desc "directories [NAME]", "Create accessory directories on host", hide: true
   def directories(name)
-    with_lock do
+    mutating do
-      with_accessory(name) do |accessory|
+      with_accessory(name) do |accessory, hosts|
-        on(accessory.hosts) do
+        on(hosts) do
           accessory.directories.keys.each do |host_path|
             execute *accessory.make_directory(host_path)
           end
@@ -49,23 +49,31 @@ class Mrsk::Cli::Accessory < Mrsk::Cli::Base
     end
   end
 
-  desc "reboot [NAME]", "Reboot existing accessory on host (stop container, remove container, start new container)"
+  desc "reboot [NAME]", "Reboot existing accessory on host (stop container, remove container, start new container; use NAME=all to boot all accessories)"
   def reboot(name)
-    with_lock do
+    mutating do
-      with_accessory(name) do |accessory|
+      if name == "all"
-        stop(name)
+        KAMAL.accessory_names.each { |accessory_name| reboot(accessory_name) }
-        remove_container(name)
+      else
-        boot(name)
+        with_accessory(name) do |accessory, hosts|
+          on(hosts) do
+            execute *KAMAL.registry.login
+          end
+
+          stop(name)
+          remove_container(name)
+          boot(name, login: false)
+        end
       end
     end
   end
 
   desc "start [NAME]", "Start existing accessory container on host"
   def start(name)
-    with_lock do
+    mutating do
-      with_accessory(name) do |accessory|
+      with_accessory(name) do |accessory, hosts|
-        on(accessory.hosts) do
+        on(hosts) do
-          execute *MRSK.auditor.record("Started #{name} accessory"), verbosity: :debug
+          execute *KAMAL.auditor.record("Started #{name} accessory"), verbosity: :debug
           execute *accessory.start
         end
       end
@@ -74,10 +82,10 @@ class Mrsk::Cli::Accessory < Mrsk::Cli::Base
 
   desc "stop [NAME]", "Stop existing accessory container on host"
   def stop(name)
-    with_lock do
+    mutating do
-      with_accessory(name) do |accessory|
+      with_accessory(name) do |accessory, hosts|
-        on(accessory.hosts) do
+        on(hosts) do
-          execute *MRSK.auditor.record("Stopped #{name} accessory"), verbosity: :debug
+          execute *KAMAL.auditor.record("Stopped #{name} accessory"), verbosity: :debug
           execute *accessory.stop, raise_on_non_zero_exit: false
         end
       end
@@ -86,7 +94,7 @@ class Mrsk::Cli::Accessory < Mrsk::Cli::Base
 
   desc "restart [NAME]", "Restart existing accessory container on host"
   def restart(name)
-    with_lock do
+    mutating do
       with_accessory(name) do
         stop(name)
         start(name)
@@ -97,10 +105,10 @@ class Mrsk::Cli::Accessory < Mrsk::Cli::Base
   desc "details [NAME]", "Show details about accessory on host (use NAME=all to show all accessories)"
   def details(name)
     if name == "all"
-      MRSK.accessory_names.each { |accessory_name| details(accessory_name) }
+      KAMAL.accessory_names.each { |accessory_name| details(accessory_name) }
     else
-      with_accessory(name) do |accessory|
+      with_accessory(name) do |accessory, hosts|
-        on(accessory.hosts) { puts capture_with_info(*accessory.info) }
+        on(hosts) { puts capture_with_info(*accessory.info) }
       end
     end
   end
@@ -109,7 +117,7 @@ class Mrsk::Cli::Accessory < Mrsk::Cli::Base
   option :interactive, aliases: "-i", type: :boolean, default: false, desc: "Execute command over ssh for an interactive shell (use for console/bash)"
   option :reuse, type: :boolean, default: false, desc: "Reuse currently running container instead of starting a new one"
   def exec(name, cmd)
-    with_accessory(name) do |accessory|
+    with_accessory(name) do |accessory, hosts|
       case
       when options[:interactive] && options[:reuse]
         say "Launching interactive command with via SSH from existing container...", :magenta
@@ -121,15 +129,15 @@ class Mrsk::Cli::Accessory < Mrsk::Cli::Base
 
       when options[:reuse]
         say "Launching command from existing container...", :magenta
-        on(accessory.hosts) do
+        on(hosts) do
-          execute *MRSK.auditor.record("Executed cmd '#{cmd}' on #{name} accessory"), verbosity: :debug
+          execute *KAMAL.auditor.record("Executed cmd '#{cmd}' on #{name} accessory"), verbosity: :debug
           capture_with_info(*accessory.execute_in_existing_container(cmd))
         end
 
       else
         say "Launching command from new container...", :magenta
-        on(accessory.hosts) do
+        on(hosts) do
-          execute *MRSK.auditor.record("Executed cmd '#{cmd}' on #{name} accessory"), verbosity: :debug
+          execute *KAMAL.auditor.record("Executed cmd '#{cmd}' on #{name} accessory"), verbosity: :debug
           capture_with_info(*accessory.execute_in_new_container(cmd))
         end
       end
@@ -142,12 +150,12 @@ class Mrsk::Cli::Accessory < Mrsk::Cli::Base
   option :grep, aliases: "-g", desc: "Show lines with grep match only (use this to fetch specific requests by id)"
   option :follow, aliases: "-f", desc: "Follow logs on primary server (or specific host set by --hosts)"
   def logs(name)
-    with_accessory(name) do |accessory|
+    with_accessory(name) do |accessory, hosts|
       grep = options[:grep]
 
       if options[:follow]
         run_locally do
-          info "Following logs on #{accessory.hosts}..."
+          info "Following logs on #{hosts}..."
           info accessory.follow_logs(grep: grep)
           exec accessory.follow_logs(grep: grep)
         end
@@ -155,7 +163,7 @@ class Mrsk::Cli::Accessory < Mrsk::Cli::Base
         since = options[:since]
         lines = options[:lines].presence || ((since || grep) ? nil : 100) # Default to 100 lines if since or grep isn't set
 
-        on(accessory.hosts) do
+        on(hosts) do
           puts capture_with_info(*accessory.logs(since: since, lines: lines, grep: grep))
         end
       end
@@ -165,11 +173,11 @@ class Mrsk::Cli::Accessory < Mrsk::Cli::Base
   desc "remove [NAME]", "Remove accessory container, image and data directory from host (use NAME=all to remove all accessories)"
   option :confirmed, aliases: "-y", type: :boolean, default: false, desc: "Proceed without confirmation question"
   def remove(name)
-    with_lock do
+    mutating do
       if name == "all"
-        MRSK.accessory_names.each { |accessory_name| remove(accessory_name) }
+        KAMAL.accessory_names.each { |accessory_name| remove(accessory_name) }
       else
-        if options[:confirmed] || ask("This will remove all containers, images and data directories for #{name}. Are you sure?", limited_to: %w( y N ), default: "N") == "y"
+        confirming "This will remove all containers, images and data directories for #{name}. Are you sure?" do
           with_accessory(name) do
             stop(name)
             remove_container(name)
@@ -183,10 +191,10 @@ class Mrsk::Cli::Accessory < Mrsk::Cli::Base
 
   desc "remove_container [NAME]", "Remove accessory container from host", hide: true
   def remove_container(name)
-    with_lock do
+    mutating do
-      with_accessory(name) do |accessory|
+      with_accessory(name) do |accessory, hosts|
-        on(accessory.hosts) do
+        on(hosts) do
-          execute *MRSK.auditor.record("Remove #{name} accessory container"), verbosity: :debug
+          execute *KAMAL.auditor.record("Remove #{name} accessory container"), verbosity: :debug
           execute *accessory.remove_container
         end
       end
@@ -195,10 +203,10 @@ class Mrsk::Cli::Accessory < Mrsk::Cli::Base
 
   desc "remove_image [NAME]", "Remove accessory image from host", hide: true
   def remove_image(name)
-    with_lock do
+    mutating do
-      with_accessory(name) do |accessory|
+      with_accessory(name) do |accessory, hosts|
-        on(accessory.hosts) do
+        on(hosts) do
-          execute *MRSK.auditor.record("Removed #{name} accessory image"), verbosity: :debug
+          execute *KAMAL.auditor.record("Removed #{name} accessory image"), verbosity: :debug
           execute *accessory.remove_image
         end
       end
@@ -207,9 +215,9 @@ class Mrsk::Cli::Accessory < Mrsk::Cli::Base
 
   desc "remove_service_directory [NAME]", "Remove accessory directory used for uploaded files and data directories from host", hide: true
   def remove_service_directory(name)
-    with_lock do
+    mutating do
-      with_accessory(name) do |accessory|
+      with_accessory(name) do |accessory, hosts|
-        on(accessory.hosts) do
+        on(hosts) do
           execute *accessory.remove_service_directory
         end
       end
@@ -218,18 +226,27 @@ class Mrsk::Cli::Accessory < Mrsk::Cli::Base
 
   private
     def with_accessory(name)
-      if accessory = MRSK.accessory(name)
+      if KAMAL.config.accessory(name)
-        yield accessory
+        accessory = KAMAL.accessory(name)
+        yield accessory, accessory_hosts(accessory)
       else
         error_on_missing_accessory(name)
       end
     end
 
     def error_on_missing_accessory(name)
-      options = MRSK.accessory_names.presence
+      options = KAMAL.accessory_names.presence
 
       error \
         "No accessory by the name of '#{name}'" +
         (options ? " (options: #{options.to_sentence})" : "")
     end
+
+    def accessory_hosts(accessory)
+      if KAMAL.specific_hosts&.any?
+        KAMAL.specific_hosts & accessory.hosts
+      else
+        accessory.hosts
+      end
+    end
 end

lib/kamal/cli/app.rb

@@ -0,0 +1,304 @@
+class Kamal::Cli::App < Kamal::Cli::Base
+  desc "boot", "Boot app on servers (or reboot app if already running)"
+  def boot
+    mutating do
+      hold_lock_on_error do
+        say "Get most recent version available as an image...", :magenta unless options[:version]
+        using_version(version_or_latest) do |version|
+          say "Start container with version #{version} using a #{KAMAL.config.readiness_delay}s readiness delay (or reboot if already running)...", :magenta
+
+          # Assets are prepared in a separate step to ensure they are on all hosts before booting
+          on(KAMAL.hosts) do
+            execute *KAMAL.auditor.record("Tagging #{KAMAL.config.absolute_image} as the latest image"), verbosity: :debug
+            execute *KAMAL.app.tag_current_image_as_latest
+
+            KAMAL.roles_on(host).each do |role|
+              Kamal::Cli::App::PrepareAssets.new(host, role, self).run
+            end
+          end
+
+
+          on(KAMAL.hosts, **KAMAL.boot_strategy) do |host|
+            KAMAL.roles_on(host).each do |role|
+              Kamal::Cli::App::Boot.new(host, role, version, self).run
+            end
+          end
+        end
+      end
+    end
+  end
+
+  desc "start", "Start existing app container on servers"
+  def start
+    mutating do
+      on(KAMAL.hosts) do |host|
+        roles = KAMAL.roles_on(host)
+
+        roles.each do |role|
+          app = KAMAL.app(role: role)
+          execute *KAMAL.auditor.record("Started app version #{KAMAL.config.version}"), verbosity: :debug
+          execute *app.start, raise_on_non_zero_exit: false
+
+          if role.running_proxy?
+            version = capture_with_info(*app.current_running_version, raise_on_non_zero_exit: false).strip
+            execute *KAMAL.proxy.deploy(app.container_name(version))
+          end
+        end
+      end
+    end
+  end
+
+  desc "stop", "Stop app container on servers"
+  def stop
+    mutating do
+      on(KAMAL.hosts) do |host|
+        roles = KAMAL.roles_on(host)
+
+        roles.each do |role|
+          app = KAMAL.app(role: role)
+          version = capture_with_info(*app.current_running_version, raise_on_non_zero_exit: false).strip
+
+          execute *KAMAL.auditor.record("Stopped app", role: role), verbosity: :debug
+
+          if role.running_proxy?
+            execute *KAMAL.proxy.remove(app.container_name(version)), raise_on_non_zero_exit: false
+          end
+
+          execute *app.stop, raise_on_non_zero_exit: false
+        end
+      end
+    end
+  end
+
+  # FIXME: Drop in favor of just containers?
+  desc "details", "Show details about app containers"
+  def details
+    on(KAMAL.hosts) do |host|
+      roles = KAMAL.roles_on(host)
+
+      roles.each do |role|
+        puts_by_host host, capture_with_info(*KAMAL.app(role: role).info)
+      end
+    end
+  end
+
+  desc "exec [CMD]", "Execute a custom command on servers (use --help to show options)"
+  option :interactive, aliases: "-i", type: :boolean, default: false, desc: "Execute command over ssh for an interactive shell (use for console/bash)"
+  option :reuse, type: :boolean, default: false, desc: "Reuse currently running container instead of starting a new one"
+  def exec(cmd)
+    case
+    when options[:interactive] && options[:reuse]
+      say "Get current version of running container...", :magenta unless options[:version]
+      using_version(options[:version] || current_running_version) do |version|
+        say "Launching interactive command with version #{version} via SSH from existing container on #{KAMAL.primary_host}...", :magenta
+        run_locally { exec KAMAL.app(role: KAMAL.primary_role).execute_in_existing_container_over_ssh(cmd, host: KAMAL.primary_host) }
+      end
+
+    when options[:interactive]
+      say "Get most recent version available as an image...", :magenta unless options[:version]
+      using_version(version_or_latest) do |version|
+        say "Launching interactive command with version #{version} via SSH from new container on #{KAMAL.primary_host}...", :magenta
+        run_locally do
+          exec KAMAL.app(role: KAMAL.primary_role).execute_in_new_container_over_ssh(cmd, host: KAMAL.primary_host)
+        end
+      end
+
+    when options[:reuse]
+      say "Get current version of running container...", :magenta unless options[:version]
+      using_version(options[:version] || current_running_version) do |version|
+        say "Launching command with version #{version} from existing container...", :magenta
+
+        on(KAMAL.hosts) do |host|
+          roles = KAMAL.roles_on(host)
+
+          roles.each do |role|
+            execute *KAMAL.auditor.record("Executed cmd '#{cmd}' on app version #{version}", role: role), verbosity: :debug
+            puts_by_host host, capture_with_info(*KAMAL.app(role: role).execute_in_existing_container(cmd))
+          end
+        end
+      end
+
+    else
+      say "Get most recent version available as an image...", :magenta unless options[:version]
+      using_version(version_or_latest) do |version|
+        say "Launching command with version #{version} from new container...", :magenta
+        on(KAMAL.hosts) do |host|
+          roles = KAMAL.roles_on(host)
+
+          roles.each do |role|
+            execute *KAMAL.auditor.record("Executed cmd '#{cmd}' on app version #{version}"), verbosity: :debug
+            puts_by_host host, capture_with_info(*KAMAL.app(role: role).execute_in_new_container(cmd))
+          end
+        end
+      end
+    end
+  end
+
+  desc "containers", "Show app containers on servers"
+  def containers
+    on(KAMAL.hosts) { |host| puts_by_host host, capture_with_info(*KAMAL.app.list_containers) }
+  end
+
+  desc "stale_containers", "Detect app stale containers"
+  option :stop, aliases: "-s", type: :boolean, default: false, desc: "Stop the stale containers found"
+  def stale_containers
+    mutating do
+      stop = options[:stop]
+
+      cli = self
+
+      on(KAMAL.hosts) do |host|
+        roles = KAMAL.roles_on(host)
+
+        roles.each do |role|
+          cli.send(:stale_versions, host: host, role: role).each do |version|
+            if stop
+              puts_by_host host, "Stopping stale container for role #{role} with version #{version}"
+              execute *KAMAL.app(role: role).stop(version: version), raise_on_non_zero_exit: false
+            else
+              puts_by_host host,  "Detected stale container for role #{role} with version #{version} (use `kamal app stale_containers --stop` to stop)"
+            end
+          end
+        end
+      end
+    end
+  end
+
+  desc "images", "Show app images on servers"
+  def images
+    on(KAMAL.hosts) { |host| puts_by_host host, capture_with_info(*KAMAL.app.list_images) }
+  end
+
+  desc "logs", "Show log lines from app on servers (use --help to show options)"
+  option :since, aliases: "-s", desc: "Show lines since timestamp (e.g. 2013-01-02T13:23:37Z) or relative (e.g. 42m for 42 minutes)"
+  option :lines, type: :numeric, aliases: "-n", desc: "Number of lines to show from each server"
+  option :grep, aliases: "-g", desc: "Show lines with grep match only (use this to fetch specific requests by id)"
+  option :follow, aliases: "-f", desc: "Follow log on primary server (or specific host set by --hosts)"
+  def logs
+    # FIXME: Catch when app containers aren't running
+
+    grep = options[:grep]
+    since = options[:since]
+    if options[:follow]
+      lines = options[:lines].presence || ((since || grep) ? nil : 10) # Default to 10 lines if since or grep isn't set
+
+      run_locally do
+        info "Following logs on #{KAMAL.primary_host}..."
+
+        KAMAL.specific_roles ||= [ "web" ]
+        role = KAMAL.roles_on(KAMAL.primary_host).first
+
+        info KAMAL.app(role: role).follow_logs(host: KAMAL.primary_host, lines: lines, grep: grep)
+        exec KAMAL.app(role: role).follow_logs(host: KAMAL.primary_host, lines: lines, grep: grep)
+      end
+    else
+      lines = options[:lines].presence || ((since || grep) ? nil : 100) # Default to 100 lines if since or grep isn't set
+
+      on(KAMAL.hosts) do |host|
+        roles = KAMAL.roles_on(host)
+
+        roles.each do |role|
+          begin
+            puts_by_host host, capture_with_info(*KAMAL.app(role: role).logs(since: since, lines: lines, grep: grep))
+          rescue SSHKit::Command::Failed
+            puts_by_host host, "Nothing found"
+          end
+        end
+      end
+    end
+  end
+
+  desc "remove", "Remove app containers and images from servers"
+  def remove
+    mutating do
+      stop
+      remove_containers
+      remove_images
+    end
+  end
+
+  desc "remove_container [VERSION]", "Remove app container with given version from servers", hide: true
+  def remove_container(version)
+    mutating do
+      on(KAMAL.hosts) do |host|
+        roles = KAMAL.roles_on(host)
+
+        roles.each do |role|
+          execute *KAMAL.auditor.record("Removed app container with version #{version}", role: role), verbosity: :debug
+          execute *KAMAL.app(role: role).remove_container(version: version)
+        end
+      end
+    end
+  end
+
+  desc "remove_containers", "Remove all app containers from servers", hide: true
+  def remove_containers
+    mutating do
+      on(KAMAL.hosts) do |host|
+        roles = KAMAL.roles_on(host)
+
+        roles.each do |role|
+          execute *KAMAL.auditor.record("Removed all app containers", role: role), verbosity: :debug
+          execute *KAMAL.app(role: role).remove_containers
+        end
+      end
+    end
+  end
+
+  desc "remove_images", "Remove all app images from servers", hide: true
+  def remove_images
+    mutating do
+      on(KAMAL.hosts) do
+        execute *KAMAL.auditor.record("Removed all app images"), verbosity: :debug
+        execute *KAMAL.app.remove_images
+      end
+    end
+  end
+
+  desc "version", "Show app version currently running on servers"
+  def version
+    on(KAMAL.hosts) do |host|
+      role = KAMAL.roles_on(host).first
+      puts_by_host host, capture_with_info(*KAMAL.app(role: role).current_running_version).strip
+    end
+  end
+
+  private
+    def using_version(new_version)
+      if new_version
+        begin
+          old_version = KAMAL.config.version
+          KAMAL.config.version = new_version
+          yield new_version
+        ensure
+          KAMAL.config.version = old_version
+        end
+      else
+        yield KAMAL.config.version
+      end
+    end
+
+    def current_running_version(host: KAMAL.primary_host)
+      version = nil
+      on(host) do
+        role = KAMAL.roles_on(host).first
+        version = capture_with_info(*KAMAL.app(role: role).current_running_version).strip
+      end
+      version.presence
+    end
+
+    def stale_versions(host:, role:)
+      versions = nil
+      on(host) do
+        versions = \
+          capture_with_info(*KAMAL.app(role: role).list_versions, raise_on_non_zero_exit: false)
+          .split("\n")
+          .drop(1)
+      end
+      versions
+    end
+
+    def version_or_latest
+      options[:version] || "latest"
+    end
+end

lib/kamal/cli/app/boot.rb

@@ -0,0 +1,59 @@
+class Kamal::Cli::App::Boot
+  attr_reader :host, :role, :version, :sshkit
+  delegate :execute, :capture_with_info, :info, to: :sshkit
+  delegate :assets?, :running_proxy?, to: :role
+
+  def initialize(host, role, version, sshkit)
+    @host = host
+    @role = role
+    @version = version
+    @sshkit = sshkit
+  end
+
+  def run
+    old_version = old_version_renamed_if_clashing
+
+    start_new_version
+
+    if old_version
+      stop_old_version(old_version)
+    end
+  end
+
+  private
+    def app
+      @app ||= KAMAL.app(role: role)
+    end
+
+    def auditor
+      @auditor = KAMAL.auditor(role: role)
+    end
+
+    def audit(message)
+      execute *auditor.record(message), verbosity: :debug
+    end
+
+    def old_version_renamed_if_clashing
+      if capture_with_info(*app.container_id_for_version(version), raise_on_non_zero_exit: false).present?
+        renamed_version = "#{version}_replaced_#{SecureRandom.hex(8)}"
+        info "Renaming container #{version} to #{renamed_version} as already deployed on #{host}"
+        audit("Renaming container #{version} to #{renamed_version}")
+        execute *app.rename_container(version: version, new_version: renamed_version)
+      end
+
+      capture_with_info(*app.current_running_version, raise_on_non_zero_exit: false).strip.presence
+    end
+
+    def start_new_version
+      audit "Booted app version #{version}"
+      execute *app.run(hostname: "#{host}-#{SecureRandom.hex(6)}")
+      if running_proxy?
+        execute *KAMAL.proxy.deploy("#{app.container_name(version)}:#{role.port}")
+      end
+    end
+
+    def stop_old_version(version)
+      execute *app.stop(version: version), raise_on_non_zero_exit: false
+      execute *app.clean_up_assets if assets?
+    end
+end

lib/kamal/cli/app/prepare_assets.rb

@@ -0,0 +1,24 @@
+class Kamal::Cli::App::PrepareAssets
+  attr_reader :host, :role, :sshkit
+  delegate :execute, :capture_with_info, :info, to: :sshkit
+  delegate :assets?, to: :role
+
+  def initialize(host, role, sshkit)
+    @host = host
+    @role = role
+    @sshkit = sshkit
+  end
+
+  def run
+    if assets?
+      execute *app.extract_assets
+      old_version = capture_with_info(*app.current_running_version, raise_on_non_zero_exit: false).strip
+      execute *app.sync_asset_volumes(old_version: old_version)
+    end
+  end
+
+  private
+    def app
+      @app ||= KAMAL.app(role: role)
+    end
+end

lib/kamal/cli/base.rb

@@ -1,8 +1,8 @@
 require "thor"
 require "dotenv"
-require "mrsk/sshkit_with_ext"
+require "kamal/sshkit_with_ext"
 
-module Mrsk::Cli
+module Kamal::Cli
   class Base < Thor
     include SSHKit::DSL
 
@@ -14,8 +14,8 @@ module Mrsk::Cli
     class_option :version, desc: "Run commands against a specific app version"
 
     class_option :primary, type: :boolean, aliases: "-p", desc: "Run commands only on primary host instead of all"
-    class_option :hosts, aliases: "-h", desc: "Run commands on these hosts instead of all (separate by comma)"
+    class_option :hosts, aliases: "-h", desc: "Run commands on these hosts instead of all (separate by comma, supports wildcards with *)"
-    class_option :roles, aliases: "-r", desc: "Run commands on these roles instead of all (separate by comma)"
+    class_option :roles, aliases: "-r", desc: "Run commands on these roles instead of all (separate by comma, supports wildcards with *)"
 
     class_option :config_file, aliases: "-c", default: "config/deploy.yml", desc: "Path to config file"
     class_option :destination, aliases: "-d", desc: "Specify destination to be used for config file (staging -> deploy.staging.yml)"
@@ -24,6 +24,7 @@ module Mrsk::Cli
 
     def initialize(*)
       super
+      @original_env = ENV.to_h.dup
       load_envs
       initialize_commander(options_with_subcommand_class_options)
     end
@@ -37,12 +38,18 @@ module Mrsk::Cli
         end
       end
 
+      def reload_envs
+        ENV.clear
+        ENV.update(@original_env)
+        load_envs
+      end
+
       def options_with_subcommand_class_options
         options.merge(@_initializer.last[:class_options] || {})
       end
 
       def initialize_commander(options)
-        MRSK.tap do |commander|
+        KAMAL.tap do |commander|
           if options[:verbose]
             ENV["VERBOSE"] = "1" # For backtraces via cli/start
             commander.verbosity = :debug
@@ -66,82 +73,127 @@ module Mrsk::Cli
       def print_runtime
         started_at = Time.now
         yield
-        return Time.now - started_at
+        Time.now - started_at
       ensure
         runtime = Time.now - started_at
         puts "  Finished all in #{sprintf("%.1f seconds", runtime)}"
       end
 
-      def with_lock
+      def mutating
-        if MRSK.holding_lock?
+        return yield if KAMAL.holding_lock?
+
+        run_hook "pre-connect"
+
+        ensure_run_and_locks_directory
+
+        acquire_lock
+
+        begin
           yield
-        else
+        rescue
-          run_hook "pre-connect"
+          if KAMAL.hold_lock_on_error?
-
+            error "  \e[31mDeploy lock was not released\e[0m"
-          acquire_lock
+          else
-
+            release_lock
-          begin
-            yield
-          rescue
-            if MRSK.hold_lock_on_error?
-              error "  \e[31mDeploy lock was not released\e[0m"
-            else
-              release_lock
-            end
-
-            raise
           end
 
-          release_lock
+          raise
+        end
+
+        release_lock
+      end
+
+      def confirming(question)
+        return yield if options[:confirmed]
+
+        if ask(question, limited_to: %w[ y N ], default: "N") == "y"
+          yield
+        else
+          say "Aborted", :red
         end
       end
 
       def acquire_lock
         raise_if_locked do
           say "Acquiring the deploy lock...", :magenta
-          on(MRSK.primary_host) { execute *MRSK.lock.acquire("Automatic deploy lock", MRSK.config.version), verbosity: :debug }
+          on(KAMAL.primary_host) { execute *KAMAL.lock.acquire("Automatic deploy lock", KAMAL.config.version), verbosity: :debug }
         end
 
-        MRSK.holding_lock = true
+        KAMAL.holding_lock = true
       end
 
       def release_lock
         say "Releasing the deploy lock...", :magenta
-        on(MRSK.primary_host) { execute *MRSK.lock.release, verbosity: :debug }
+        on(KAMAL.primary_host) { execute *KAMAL.lock.release, verbosity: :debug }
 
-        MRSK.holding_lock = false
+        KAMAL.holding_lock = false
       end
 
       def raise_if_locked
         yield
       rescue SSHKit::Runner::ExecuteError => e
         if e.message =~ /cannot create directory/
-          on(MRSK.primary_host) { puts capture_with_debug(*MRSK.lock.status) }
+          say "Deploy lock already in place!", :red
-          raise LockError, "Deploy lock found"
+          on(KAMAL.primary_host) { puts capture_with_debug(*KAMAL.lock.status) }
+          raise LockError, "Deploy lock found. Run 'kamal lock help' for more information"
         else
           raise e
         end
       end
 
       def hold_lock_on_error
-        if MRSK.hold_lock_on_error?
+        if KAMAL.hold_lock_on_error?
           yield
         else
-          MRSK.hold_lock_on_error = true
+          KAMAL.hold_lock_on_error = true
           yield
-          MRSK.hold_lock_on_error = false
+          KAMAL.hold_lock_on_error = false
         end
       end
 
-      def run_hook(hook, **details)
+      def run_hook(hook, **extra_details)
-        if !options[:skip_hooks] && MRSK.hook.hook_exists?(hook)
+        if !options[:skip_hooks] && KAMAL.hook.hook_exists?(hook)
+          details = { hosts: KAMAL.hosts.join(","), command: command, subcommand: subcommand }
+
           say "Running the #{hook} hook...", :magenta
           run_locally do
-            MRSK.with_verbosity(:debug) { execute *MRSK.hook.run(hook, **details, hosts: MRSK.hosts.join(",")) }
+            KAMAL.with_verbosity(:debug) { execute *KAMAL.hook.run(hook, **details, **extra_details) }
           rescue SSHKit::Command::Failed
             raise HookError.new("Hook `#{hook}` failed")
           end
         end
       end
+
+      def command
+        @kamal_command ||= begin
+          invocation_class, invocation_commands = *first_invocation
+          if invocation_class == Kamal::Cli::Main
+            invocation_commands[0]
+          else
+            Kamal::Cli::Main.subcommand_classes.find { |command, clazz| clazz == invocation_class }[0]
+          end
+        end
+      end
+
+      def subcommand
+        @kamal_subcommand ||= begin
+          invocation_class, invocation_commands = *first_invocation
+          invocation_commands[0] if invocation_class != Kamal::Cli::Main
+        end
+      end
+
+      def first_invocation
+        instance_variable_get("@_invocations").first
+      end
+
+      def ensure_run_and_locks_directory
+        on(KAMAL.hosts) do
+          execute(*KAMAL.server.ensure_run_directory)
+        end
+
+        on(KAMAL.primary_host) do
+          execute(*KAMAL.lock.ensure_locks_directory)
+        end
+      end
   end
 end

lib/kamal/cli/build.rb

@@ -1,9 +1,11 @@
-class Mrsk::Cli::Build < Mrsk::Cli::Base
+require "uri"
+
+class Kamal::Cli::Build < Kamal::Cli::Base
   class BuildError < StandardError; end
 
   desc "deliver", "Build app and push app image to registry then pull image on servers"
   def deliver
-    with_lock do
+    mutating do
       push
       pull
     end
@@ -11,21 +13,27 @@ class Mrsk::Cli::Build < Mrsk::Cli::Base
 
   desc "push", "Build and push app image to registry"
   def push
-    with_lock do
+    mutating do
       cli = self
 
       verify_local_dependencies
       run_hook "pre-build"
 
+      if (uncommitted_changes = Kamal::Git.uncommitted_changes).present?
+        say "The following paths have uncommitted changes:\n #{uncommitted_changes}", :yellow
+      end
+
       run_locally do
         begin
-          MRSK.with_verbosity(:debug) { execute *MRSK.builder.push }
+          KAMAL.with_verbosity(:debug) do
+            execute *KAMAL.builder.push
+          end
         rescue SSHKit::Command::Failed => e
           if e.message =~ /(no builder)|(no such file or directory)/
             error "Missing compatible builder, so creating a new one first"
 
             if cli.create
-              MRSK.with_verbosity(:debug) { execute *MRSK.builder.push }
+              KAMAL.with_verbosity(:debug) { execute *KAMAL.builder.push }
             end
           else
             raise
@@ -37,22 +45,27 @@ class Mrsk::Cli::Build < Mrsk::Cli::Base
 
   desc "pull", "Pull app image from registry onto servers"
   def pull
-    with_lock do
+    mutating do
-      on(MRSK.hosts) do
+      on(KAMAL.hosts) do
-        execute *MRSK.auditor.record("Pulled image with version #{MRSK.config.version}"), verbosity: :debug
+        execute *KAMAL.auditor.record("Pulled image with version #{KAMAL.config.version}"), verbosity: :debug
-        execute *MRSK.builder.clean, raise_on_non_zero_exit: false
+        execute *KAMAL.builder.clean, raise_on_non_zero_exit: false
-        execute *MRSK.builder.pull
+        execute *KAMAL.builder.pull
+        execute *KAMAL.builder.validate_image
       end
     end
   end
 
   desc "create", "Create a build setup"
   def create
-    with_lock do
+    mutating do
+      if (remote_host = KAMAL.config.builder.remote_host)
+        connect_to_remote_host(remote_host)
+      end
+
       run_locally do
         begin
-          debug "Using builder: #{MRSK.builder.name}"
+          debug "Using builder: #{KAMAL.builder.name}"
-          execute *MRSK.builder.create
+          execute *KAMAL.builder.create
         rescue SSHKit::Command::Failed => e
           if e.message =~ /stderr=(.*)/
             error "Couldn't create remote builder: #{$1}"
@@ -67,10 +80,10 @@ class Mrsk::Cli::Build < Mrsk::Cli::Base
 
   desc "remove", "Remove build setup"
   def remove
-    with_lock do
+    mutating do
       run_locally do
-        debug "Using builder: #{MRSK.builder.name}"
+        debug "Using builder: #{KAMAL.builder.name}"
-        execute *MRSK.builder.remove
+        execute *KAMAL.builder.remove
       end
     end
   end
@@ -78,8 +91,8 @@ class Mrsk::Cli::Build < Mrsk::Cli::Base
   desc "details", "Show build setup"
   def details
     run_locally do
-      puts "Builder: #{MRSK.builder.name}"
+      puts "Builder: #{KAMAL.builder.name}"
-      puts capture(*MRSK.builder.info)
+      puts capture(*KAMAL.builder.info)
     end
   end
 
@@ -87,7 +100,7 @@ class Mrsk::Cli::Build < Mrsk::Cli::Base
     def verify_local_dependencies
       run_locally do
         begin
-          execute *MRSK.builder.ensure_local_dependencies_installed
+          execute *KAMAL.builder.ensure_local_dependencies_installed
         rescue SSHKit::Command::Failed => e
           build_error = e.message =~ /command not found/ ?
             "Docker is not installed locally" :
@@ -97,4 +110,14 @@ class Mrsk::Cli::Build < Mrsk::Cli::Base
         end
       end
     end
+
+    def connect_to_remote_host(remote_host)
+      remote_uri = URI.parse(remote_host)
+      if remote_uri.scheme == "ssh"
+        options = { user: remote_uri.user, port: remote_uri.port }.compact
+        on(remote_uri.host, options) do
+          execute "true"
+        end
+      end
+    end
 end

lib/kamal/cli/env.rb

@@ -0,0 +1,45 @@
+require "tempfile"
+
+class Kamal::Cli::Env < Kamal::Cli::Base
+  desc "push", "Push the env file to the remote hosts"
+  def push
+    mutating do
+      on(KAMAL.hosts) do
+        execute *KAMAL.auditor.record("Pushed env files"), verbosity: :debug
+
+        KAMAL.roles_on(host).each do |role|
+          execute *KAMAL.app(role: role).make_env_directory
+          upload! role.env.secrets_io, role.env.secrets_file, mode: 400
+        end
+      end
+
+      on(KAMAL.accessory_hosts) do
+        KAMAL.accessories_on(host).each do |accessory|
+          accessory_config = KAMAL.config.accessory(accessory)
+          execute *KAMAL.accessory(accessory).make_env_directory
+          upload! accessory_config.env.secrets_io, accessory_config.env.secrets_file, mode: 400
+        end
+      end
+    end
+  end
+
+  desc "delete", "Delete the env file from the remote hosts"
+  def delete
+    mutating do
+      on(KAMAL.hosts) do
+        execute *KAMAL.auditor.record("Deleted env files"), verbosity: :debug
+
+        KAMAL.roles_on(host).each do |role|
+          execute *KAMAL.app(role: role).remove_env_file
+        end
+      end
+
+      on(KAMAL.accessory_hosts) do
+        KAMAL.accessories_on(host).each do |accessory|
+          accessory_config = KAMAL.config.accessory(accessory)
+          execute *KAMAL.accessory(accessory).remove_env_file
+        end
+      end
+    end
+  end
+end

lib/kamal/cli/healthcheck.rb

@@ -0,0 +1,21 @@
+class Kamal::Cli::Healthcheck < Kamal::Cli::Base
+  default_command :perform
+
+  desc "perform", "Health check current app version"
+  def perform
+    raise "The primary host is not configured to run a proxy" unless KAMAL.config.role(KAMAL.config.primary_role).running_proxy?
+    on(KAMAL.primary_host) do
+      begin
+        execute *KAMAL.healthcheck.run
+        Poller.wait_for_healthy { capture_with_info(*KAMAL.healthcheck.status) }
+      rescue Poller::HealthcheckError => e
+        error capture_with_info(*KAMAL.healthcheck.logs)
+        error capture_with_pretty_json(*KAMAL.healthcheck.container_health_log)
+        raise
+      ensure
+        execute *KAMAL.healthcheck.stop, raise_on_non_zero_exit: false
+        execute *KAMAL.healthcheck.remove, raise_on_non_zero_exit: false
+      end
+    end
+  end
+end

lib/kamal/cli/healthcheck/poller.rb

@@ -0,0 +1,64 @@
+module Kamal::Cli::Healthcheck::Poller
+  extend self
+
+  TRAEFIK_UPDATE_DELAY = 5
+
+  class HealthcheckError < StandardError; end
+
+  def wait_for_healthy(pause_after_ready: false, &block)
+    attempt = 1
+    max_attempts = KAMAL.config.healthcheck["max_attempts"]
+
+    begin
+      case status = block.call
+      when "healthy"
+        sleep TRAEFIK_UPDATE_DELAY if pause_after_ready
+      when "running" # No health check configured
+        sleep KAMAL.config.readiness_delay if pause_after_ready
+      else
+        raise HealthcheckError, "container not ready (#{status})"
+      end
+    rescue HealthcheckError => e
+      if attempt <= max_attempts
+        info "#{e.message}, retrying in #{attempt}s (attempt #{attempt}/#{max_attempts})..."
+        sleep attempt
+        attempt += 1
+        retry
+      else
+        raise
+      end
+    end
+
+    info "Container is healthy!"
+  end
+
+  def wait_for_unhealthy(pause_after_ready: false, &block)
+    attempt = 1
+    max_attempts = KAMAL.config.healthcheck["max_attempts"]
+
+    begin
+      case status = block.call
+      when "unhealthy"
+        sleep TRAEFIK_UPDATE_DELAY if pause_after_ready
+      else
+        raise HealthcheckError, "container not unhealthy (#{status})"
+      end
+    rescue HealthcheckError => e
+      if attempt <= max_attempts
+        info "#{e.message}, retrying in #{attempt}s (attempt #{attempt}/#{max_attempts})..."
+        sleep attempt
+        attempt += 1
+        retry
+      else
+        raise
+      end
+    end
+
+    info "Container is unhealthy!"
+  end
+
+  private
+    def info(message)
+      SSHKit.config.output.info(message)
+    end
+end

lib/kamal/cli/lock.rb

@@ -1,17 +1,23 @@
-class Mrsk::Cli::Lock < Mrsk::Cli::Base
+class Kamal::Cli::Lock < Kamal::Cli::Base
   desc "status", "Report lock status"
   def status
     handle_missing_lock do
-      on(MRSK.primary_host) { puts capture_with_debug(*MRSK.lock.status) }
+      on(KAMAL.primary_host) do
+        execute *KAMAL.server.ensure_run_directory
+        puts capture_with_debug(*KAMAL.lock.status)
+      end
     end
   end
 
   desc "acquire", "Acquire the deploy lock"
-  option :message, aliases: "-m", type: :string, desc: "A lock mesasge", required: true
+  option :message, aliases: "-m", type: :string, desc: "A lock message", required: true
   def acquire
     message = options[:message]
     raise_if_locked do
-      on(MRSK.primary_host) { execute *MRSK.lock.acquire(message, MRSK.config.version), verbosity: :debug }
+      on(KAMAL.primary_host) do
+        execute *KAMAL.server.ensure_run_directory
+        execute *KAMAL.lock.acquire(message, KAMAL.config.version), verbosity: :debug
+      end
       say "Acquired the deploy lock"
     end
   end
@@ -19,7 +25,10 @@ class Mrsk::Cli::Lock < Mrsk::Cli::Base
   desc "release", "Release the deploy lock"
   def release
     handle_missing_lock do
-      on(MRSK.primary_host) { execute *MRSK.lock.release, verbosity: :debug }
+      on(KAMAL.primary_host) do
+        execute *KAMAL.server.ensure_run_directory
+        execute *KAMAL.lock.release, verbosity: :debug
+      end
       say "Released the deploy lock"
     end
   end

lib/kamal/cli/main.rb

@@ -0,0 +1,268 @@
+class Kamal::Cli::Main < Kamal::Cli::Base
+  desc "setup", "Setup all accessories, push the env, and deploy app to servers"
+  option :skip_push, aliases: "-P", type: :boolean, default: false, desc: "Skip image build and push"
+  def setup
+    print_runtime do
+      mutating do
+        invoke_options = deploy_options
+
+        say "Ensure Docker is installed...", :magenta
+        invoke "kamal:cli:server:bootstrap", [], invoke_options
+
+        say "Push env files...", :magenta
+        invoke "kamal:cli:env:push", [], invoke_options
+
+        invoke "kamal:cli:accessory:boot", [ "all" ], invoke_options
+        deploy
+      end
+    end
+  end
+
+  desc "deploy", "Deploy app to servers"
+  option :skip_push, aliases: "-P", type: :boolean, default: false, desc: "Skip image build and push"
+  def deploy
+    runtime = print_runtime do
+      mutating do
+        invoke_options = deploy_options
+
+        say "Log into image registry...", :magenta
+        invoke "kamal:cli:registry:login", [], invoke_options
+
+        if options[:skip_push]
+          say "Pull app image...", :magenta
+          invoke "kamal:cli:build:pull", [], invoke_options
+        else
+          say "Build and push app image...", :magenta
+          invoke "kamal:cli:build:deliver", [], invoke_options
+        end
+
+        run_hook "pre-deploy"
+
+        say "Ensure proxy is running...", :magenta
+        invoke "kamal:cli:proxy:boot", [], invoke_options
+
+        if KAMAL.config.role(KAMAL.config.primary_role).running_proxy?
+          say "Ensure app can pass healthcheck...", :magenta
+          invoke "kamal:cli:healthcheck:perform", [], invoke_options
+        end
+
+        say "Detect stale containers...", :magenta
+        invoke "kamal:cli:app:stale_containers", [], invoke_options.merge(stop: true)
+
+        invoke "kamal:cli:app:boot", [], invoke_options
+
+        say "Prune old containers and images...", :magenta
+        invoke "kamal:cli:prune:all", [], invoke_options
+      end
+    end
+
+    run_hook "post-deploy", runtime: runtime.round
+  end
+
+  desc "redeploy", "Deploy app to servers without bootstrapping servers, starting proxy, pruning, and registry login"
+  option :skip_push, aliases: "-P", type: :boolean, default: false, desc: "Skip image build and push"
+  def redeploy
+    runtime = print_runtime do
+      mutating do
+        invoke_options = deploy_options
+
+        if options[:skip_push]
+          say "Pull app image...", :magenta
+          invoke "kamal:cli:build:pull", [], invoke_options
+        else
+          say "Build and push app image...", :magenta
+          invoke "kamal:cli:build:deliver", [], invoke_options
+        end
+
+        run_hook "pre-deploy"
+
+        say "Ensure app can pass healthcheck...", :magenta
+        invoke "kamal:cli:healthcheck:perform", [], invoke_options
+
+        say "Detect stale containers...", :magenta
+        invoke "kamal:cli:app:stale_containers", [], invoke_options.merge(stop: true)
+
+        invoke "kamal:cli:app:boot", [], invoke_options
+      end
+    end
+
+    run_hook "post-deploy", runtime: runtime.round
+  end
+
+  desc "rollback [VERSION]", "Rollback app to VERSION"
+  def rollback(version)
+    rolled_back = false
+    runtime = print_runtime do
+      mutating do
+        invoke_options = deploy_options
+
+        KAMAL.config.version = version
+        old_version = nil
+
+        if container_available?(version)
+          run_hook "pre-deploy"
+
+          invoke "kamal:cli:app:boot", [], invoke_options.merge(version: version)
+          rolled_back = true
+        else
+          say "The app version '#{version}' is not available as a container (use 'kamal app containers' for available versions)", :red
+        end
+      end
+    end
+
+    run_hook "post-deploy", runtime: runtime.round if rolled_back
+  end
+
+  desc "details", "Show details about all containers"
+  def details
+    invoke "kamal:cli:proxy:details"
+    invoke "kamal:cli:app:details"
+    invoke "kamal:cli:accessory:details", [ "all" ]
+  end
+
+  desc "audit", "Show audit log from servers"
+  def audit
+    on(KAMAL.hosts) do |host|
+      puts_by_host host, capture_with_info(*KAMAL.auditor.reveal)
+    end
+  end
+
+  desc "config", "Show combined config (including secrets!)"
+  def config
+    run_locally do
+      puts Kamal::Utils.redacted(KAMAL.config.to_h).to_yaml
+    end
+  end
+
+  desc "init", "Create config stub in config/deploy.yml and env stub in .env"
+  option :bundle, type: :boolean, default: false, desc: "Add Kamal to the Gemfile and create a bin/kamal binstub"
+  def init
+    require "fileutils"
+
+    if (deploy_file = Pathname.new(File.expand_path("config/deploy.yml"))).exist?
+      puts "Config file already exists in config/deploy.yml (remove first to create a new one)"
+    else
+      FileUtils.mkdir_p deploy_file.dirname
+      FileUtils.cp_r Pathname.new(File.expand_path("templates/deploy.yml", __dir__)), deploy_file
+      puts "Created configuration file in config/deploy.yml"
+    end
+
+    unless (deploy_file = Pathname.new(File.expand_path(".env"))).exist?
+      FileUtils.cp_r Pathname.new(File.expand_path("templates/template.env", __dir__)), deploy_file
+      puts "Created .env file"
+    end
+
+    unless (hooks_dir = Pathname.new(File.expand_path(".kamal/hooks"))).exist?
+      hooks_dir.mkpath
+      Pathname.new(File.expand_path("templates/sample_hooks", __dir__)).each_child do |sample_hook|
+        FileUtils.cp sample_hook, hooks_dir, preserve: true
+      end
+      puts "Created sample hooks in .kamal/hooks"
+    end
+
+    if options[:bundle]
+      if (binstub = Pathname.new(File.expand_path("bin/kamal"))).exist?
+        puts "Binstub already exists in bin/kamal (remove first to create a new one)"
+      else
+        puts "Adding Kamal to Gemfile and bundle..."
+        run_locally do
+          execute :bundle, :add, :kamal
+          execute :bundle, :binstubs, :kamal
+        end
+        puts "Created binstub file in bin/kamal"
+      end
+    end
+  end
+
+  desc "envify", "Create .env by evaluating .env.erb (or .env.staging.erb -> .env.staging when using -d staging)"
+  option :skip_push, aliases: "-P", type: :boolean, default: false, desc: "Skip .env file push"
+  def envify
+    if destination = options[:destination]
+      env_template_path = ".env.#{destination}.erb"
+      env_path          = ".env.#{destination}"
+    else
+      env_template_path = ".env.erb"
+      env_path          = ".env"
+    end
+
+    File.write(env_path, ERB.new(File.read(env_template_path), trim_mode: "-").result, perm: 0600)
+
+    unless options[:skip_push]
+      reload_envs
+      invoke "kamal:cli:env:push", options
+    end
+  end
+
+  desc "remove", "Remove proxy, app, accessories, and registry session from servers"
+  option :confirmed, aliases: "-y", type: :boolean, default: false, desc: "Proceed without confirmation question"
+  def remove
+    mutating do
+      confirming "This will remove all containers and images. Are you sure?" do
+        invoke "kamal:cli:proxy:remove", [], options.without(:confirmed)
+        invoke "kamal:cli:app:remove", [], options.without(:confirmed)
+        invoke "kamal:cli:accessory:remove", [ "all" ], options
+        invoke "kamal:cli:registry:logout", [], options.without(:confirmed)
+      end
+    end
+  end
+
+  desc "version", "Show Kamal version"
+  def version
+    puts Kamal::VERSION
+  end
+
+  desc "accessory", "Manage accessories (db/redis/search)"
+  subcommand "accessory", Kamal::Cli::Accessory
+
+  desc "app", "Manage application"
+  subcommand "app", Kamal::Cli::App
+
+  desc "build", "Build application image"
+  subcommand "build", Kamal::Cli::Build
+
+  desc "env", "Manage environment files"
+  subcommand "env", Kamal::Cli::Env
+
+  desc "healthcheck", "Healthcheck application"
+  subcommand "healthcheck", Kamal::Cli::Healthcheck
+
+  desc "lock", "Manage the deploy lock"
+  subcommand "lock", Kamal::Cli::Lock
+
+  desc "prune", "Prune old application images and containers"
+  subcommand "prune", Kamal::Cli::Prune
+
+  desc "registry", "Login and -out of the image registry"
+  subcommand "registry", Kamal::Cli::Registry
+
+  desc "server", "Bootstrap servers with curl and Docker"
+  subcommand "server", Kamal::Cli::Server
+
+  desc "proxy", "Manage load balancer proxy"
+  subcommand "proxy", Kamal::Cli::Proxy
+
+  private
+    def container_available?(version)
+      begin
+        on(KAMAL.hosts) do
+          KAMAL.roles_on(host).each do |role|
+            container_id = capture_with_info(*KAMAL.app(role: role).container_id_for_version(version))
+            raise "Container not found" unless container_id.present?
+          end
+        end
+      rescue SSHKit::Runner::ExecuteError => e
+        if e.message =~ /Container not found/
+          say "Error looking for container version #{version}: #{e.message}"
+          return false
+        else
+          raise
+        end
+      end
+
+      true
+    end
+
+    def deploy_options
+      { "version" => KAMAL.config.version }.merge(options.without("skip_push"))
+    end
+end

lib/kamal/cli/proxy.rb

@@ -0,0 +1,120 @@
+class Kamal::Cli::Proxy < Kamal::Cli::Base
+  desc "boot", "Boot proxy on servers"
+  def boot
+    mutating do
+      on(KAMAL.proxy_hosts) do
+        execute *KAMAL.registry.login
+        execute *KAMAL.proxy.start_or_run
+      end
+    end
+  end
+
+  desc "reboot", "Reboot proxy on servers (stop container, remove container, start new container)"
+  option :rolling, type: :boolean, default: false, desc: "Reboot proxy on hosts in sequence, rather than in parallel"
+  option :confirmed, aliases: "-y", type: :boolean, default: false, desc: "Proceed without confirmation question"
+  def reboot
+    confirming "This will cause a brief outage on each host. Are you sure?" do
+      mutating do
+        host_groups = options[:rolling] ? KAMAL.proxy_hosts : [ KAMAL.proxy_hosts ]
+        host_groups.each do |hosts|
+          host_list = Array(hosts).join(",")
+          run_hook "pre-proxy-reboot", hosts: host_list
+          on(hosts) do
+            execute *KAMAL.auditor.record("Rebooted proxy"), verbosity: :debug
+            execute *KAMAL.registry.login
+            execute *KAMAL.proxy.stop, raise_on_non_zero_exit: false
+            execute *KAMAL.proxy.remove_container
+            execute *KAMAL.proxy.run
+          end
+          run_hook "post-proxy-reboot", hosts: host_list
+        end
+      end
+    end
+  end
+
+  desc "start", "Start existing proxy container on servers"
+  def start
+    mutating do
+      on(KAMAL.proxy_hosts) do
+        execute *KAMAL.auditor.record("Started proxy"), verbosity: :debug
+        execute *KAMAL.proxy.start
+      end
+    end
+  end
+
+  desc "stop", "Stop existing proxy container on servers"
+  def stop
+    mutating do
+      on(KAMAL.proxy_hosts) do
+        execute *KAMAL.auditor.record("Stopped proxy"), verbosity: :debug
+        execute *KAMAL.proxy.stop, raise_on_non_zero_exit: false
+      end
+    end
+  end
+
+  desc "restart", "Restart existing proxy container on servers"
+  def restart
+    mutating do
+      stop
+      start
+    end
+  end
+
+  desc "details", "Show details about proxy container from servers"
+  def details
+    on(KAMAL.proxy_hosts) { |host| puts_by_host host, capture_with_info(*KAMAL.proxy.info), type: "Proxy" }
+  end
+
+  desc "logs", "Show log lines from proxy on servers"
+  option :since, aliases: "-s", desc: "Show logs since timestamp (e.g. 2013-01-02T13:23:37Z) or relative (e.g. 42m for 42 minutes)"
+  option :lines, type: :numeric, aliases: "-n", desc: "Number of log lines to pull from each server"
+  option :grep, aliases: "-g", desc: "Show lines with grep match only (use this to fetch specific requests by id)"
+  option :follow, aliases: "-f", desc: "Follow logs on primary server (or specific host set by --hosts)"
+  def logs
+    grep = options[:grep]
+
+    if options[:follow]
+      run_locally do
+        info "Following logs on #{KAMAL.primary_host}..."
+        info KAMAL.proxy.follow_logs(host: KAMAL.primary_host, grep: grep)
+        exec KAMAL.proxy.follow_logs(host: KAMAL.primary_host, grep: grep)
+      end
+    else
+      since = options[:since]
+      lines = options[:lines].presence || ((since || grep) ? nil : 100) # Default to 100 lines if since or grep isn't set
+
+      on(KAMAL.proxy_hosts) do |host|
+        puts_by_host host, capture(*KAMAL.proxy.logs(since: since, lines: lines, grep: grep)), type: "Proxy"
+      end
+    end
+  end
+
+  desc "remove", "Remove proxy container and image from servers"
+  def remove
+    mutating do
+      stop
+      remove_container
+      remove_image
+    end
+  end
+
+  desc "remove_container", "Remove proxy container from servers", hide: true
+  def remove_container
+    mutating do
+      on(KAMAL.proxy_hosts) do
+        execute *KAMAL.auditor.record("Removed proxy container"), verbosity: :debug
+        execute *KAMAL.proxy.remove_container
+      end
+    end
+  end
+
+  desc "remove_image", "Remove proxy image from servers", hide: true
+  def remove_image
+    mutating do
+      on(KAMAL.proxy_hosts) do
+        execute *KAMAL.auditor.record("Removed proxy image"), verbosity: :debug
+        execute *KAMAL.proxy.remove_image
+      end
+    end
+  end
+end

lib/kamal/cli/prune.rb

@@ -0,0 +1,35 @@
+class Kamal::Cli::Prune < Kamal::Cli::Base
+  desc "all", "Prune unused images and stopped containers"
+  def all
+    mutating do
+      containers
+      images
+    end
+  end
+
+  desc "images", "Prune unused images"
+  def images
+    mutating do
+      on(KAMAL.hosts) do
+        execute *KAMAL.auditor.record("Pruned images"), verbosity: :debug
+        execute *KAMAL.prune.dangling_images
+        execute *KAMAL.prune.tagged_images
+      end
+    end
+  end
+
+  desc "containers", "Prune all stopped containers, except the last n (default 5)"
+  option :retain, type: :numeric, default: nil, desc: "Number of containers to retain"
+  def containers
+    retain = options.fetch(:retain, KAMAL.config.retain_containers)
+    raise "retain must be at least 1" if retain < 1
+
+    mutating do
+      on(KAMAL.hosts) do
+        execute *KAMAL.auditor.record("Pruned containers"), verbosity: :debug
+        execute *KAMAL.prune.app_containers(retain: retain)
+        execute *KAMAL.prune.healthcheck_containers
+      end
+    end
+  end
+end

lib/kamal/cli/registry.rb

@@ -1,8 +1,8 @@
-class Mrsk::Cli::Registry < Mrsk::Cli::Base
+class Kamal::Cli::Registry < Kamal::Cli::Base
   desc "login", "Log in to registry locally and remotely"
   def login
-    run_locally    { execute *MRSK.registry.login }
+    run_locally    { execute *KAMAL.registry.login }
-    on(MRSK.hosts) { execute *MRSK.registry.login }
+    on(KAMAL.hosts) { execute *KAMAL.registry.login }
   # FIXME: This rescue needed?
   rescue ArgumentError => e
     puts e.message
@@ -10,7 +10,7 @@ class Mrsk::Cli::Registry < Mrsk::Cli::Base
 
   desc "logout", "Log out of registry remotely"
   def logout
-    on(MRSK.hosts) { execute *MRSK.registry.logout }
+    on(KAMAL.hosts) { execute *KAMAL.registry.logout }
   # FIXME: This rescue needed?
   rescue ArgumentError => e
     puts e.message

lib/kamal/cli/server.rb

@@ -0,0 +1,33 @@
+class Kamal::Cli::Server < Kamal::Cli::Base
+  desc "bootstrap", "Set up Docker to run Kamal apps"
+  def bootstrap
+    missing = []
+
+    on(KAMAL.hosts | KAMAL.accessory_hosts) do |host|
+      unless execute(*KAMAL.docker.installed?, raise_on_non_zero_exit: false)
+        if execute(*KAMAL.docker.superuser?, raise_on_non_zero_exit: false)
+          info "Missing Docker on #{host}. Installing…"
+          execute *KAMAL.docker.install
+        else
+          missing << host
+        end
+      end
+
+      execute(*KAMAL.server.ensure_run_directory)
+
+      begin
+        execute(*KAMAL.docker.create_kamal_network)
+      rescue SSHKit::Command::Failed => e
+        if e.message !~ /network with name kamal already exists/
+          raise
+        end
+      end
+    end
+
+    if missing.any?
+      raise "Docker is not installed on #{missing.join(", ")} and can't be automatically installed without having root access and either `wget` or `curl`. Install Docker manually: https://docs.docker.com/engine/install/"
+    end
+
+    run_hook "docker-setup"
+  end
+end

lib/kamal/cli/templates/deploy.yml

@@ -16,9 +16,10 @@ registry:
 
   # Always use an access token rather than real password when possible.
   password:
-    - MRSK_REGISTRY_PASSWORD
+    - KAMAL_REGISTRY_PASSWORD
 
 # Inject ENV variables into containers (secrets come from .env).
+# Remember to run `kamal env push` after making changes!
 # env:
 #   clear:
 #     DB_HOST: 192.168.0.2
@@ -52,7 +53,7 @@ registry:
 #         - MYSQL_ROOT_PASSWORD
 #     files:
 #       - config/mysql/production.cnf:/etc/mysql/my.cnf
-#       - db/production.sql.erb:/docker-entrypoint-initdb.d/setup.sql
+#       - db/production.sql:/docker-entrypoint-initdb.d/setup.sql
 #     directories:
 #       - data:/var/lib/mysql
 #   redis:
@@ -62,13 +63,33 @@ registry:
 #     directories:
 #       - data:/data
 
-# Configure custom arguments for Traefik
-# traefik:
-#   args:
-#     accesslog: true
-#     accesslog.format: json
-
 # Configure a custom healthcheck (default is /up on port 3000)
 # healthcheck:
 #   path: /healthz
 #   port: 4000
+
+# Bridge fingerprinted assets, like JS and CSS, between versions to avoid
+# hitting 404 on in-flight requests. Combines all files from new and old
+# version inside the asset_path.
+#
+# If your app is using the Sprockets gem, ensure it sets `config.assets.manifest`.
+# See https://github.com/basecamp/kamal/issues/626 for details
+#
+# asset_path: /rails/public/assets
+
+# Configure rolling deploys by setting a wait time between batches of restarts.
+# boot:
+#   limit: 10 # Can also specify as a percentage of total hosts, such as "25%"
+#   wait: 2
+
+# Configure the role used to determine the primary_host. This host takes
+# deploy locks, runs health checks during the deploy, and follow logs, etc.
+#
+# Caution: there's no support for role renaming yet, so be careful to cleanup
+#          the previous role on the deployed hosts.
+# primary_role: web
+
+# Controls if we abort when see a role with no hosts. Disabling this may be
+# useful for more complex deploy configurations.
+#
+# allow_empty_roles: false

lib/kamal/cli/templates/sample_hooks/docker-setup.sample

@@ -0,0 +1,7 @@
+#!/usr/bin/env ruby
+
+# A sample docker-setup hook
+#
+# Sets up a Docker network which can then be used by the application’s containers
+
+ssh user@example.com docker network create kamal

lib/kamal/cli/templates/sample_hooks/post-deploy.sample

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+# A sample post-deploy hook
+#
+# These environment variables are available:
+# KAMAL_RECORDED_AT
+# KAMAL_PERFORMER
+# KAMAL_VERSION
+# KAMAL_HOSTS
+# KAMAL_ROLE (if set)
+# KAMAL_DESTINATION (if set)
+# KAMAL_RUNTIME
+
+echo "$KAMAL_PERFORMER deployed $KAMAL_VERSION to $KAMAL_DESTINATION in $KAMAL_RUNTIME seconds"

lib/kamal/cli/templates/sample_hooks/post-traefik-reboot.sample

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+echo "Rebooted proxy on $KAMAL_HOSTS"

lib/kamal/cli/templates/sample_hooks/pre-build.sample

@@ -9,12 +9,12 @@
 # 4. The version we are deploying matches the remote
 #
 # These environment variables are available:
-# MRSK_RECORDED_AT
+# KAMAL_RECORDED_AT
-# MRSK_PERFORMER
+# KAMAL_PERFORMER
-# MRSK_VERSION
+# KAMAL_VERSION
-# MRSK_HOSTS
+# KAMAL_HOSTS
-# MRSK_ROLE (if set)
+# KAMAL_ROLE (if set)
-# MRSK_DESTINATION (if set)
+# KAMAL_DESTINATION (if set)
 
 if [ -n "$(git status --porcelain)" ]; then
   echo "Git checkout is not clean, aborting..." >&2
@@ -32,7 +32,7 @@ fi
 current_branch=$(git branch --show-current)
 
 if [ -z "$current_branch" ]; then
-  echo "No git remote set, aborting..." >&2
+  echo "Not on a git branch, aborting..." >&2
   exit 1
 fi
 
@@ -43,8 +43,8 @@ if [ -z "$remote_head" ]; then
   exit 1
 fi
 
-if [ "$MRSK_VERSION" != "$remote_head" ]; then
+if [ "$KAMAL_VERSION" != "$remote_head" ]; then
-  echo "Version ($MRSK_VERSION) does not match remote HEAD ($remote_head), aborting..." >&2
+  echo "Version ($KAMAL_VERSION) does not match remote HEAD ($remote_head), aborting..." >&2
   exit 1
 fi
 

lib/kamal/cli/templates/sample_hooks/pre-connect.sample

@@ -5,15 +5,15 @@
 # Warms DNS before connecting to hosts in parallel
 #
 # These environment variables are available:
-# MRSK_RECORDED_AT
+# KAMAL_RECORDED_AT
-# MRSK_PERFORMER
+# KAMAL_PERFORMER
-# MRSK_VERSION
+# KAMAL_VERSION
-# MRSK_HOSTS
+# KAMAL_HOSTS
-# MRSK_ROLE (if set)
+# KAMAL_ROLE (if set)
-# MRSK_DESTINATION (if set)
+# KAMAL_DESTINATION (if set)
-# MRSK_RUNTIME
+# KAMAL_RUNTIME
 
-hosts = ENV["MRSK_HOSTS"].split(",")
+hosts = ENV["KAMAL_HOSTS"].split(",")
 results = nil
 max = 3
 

lib/kamal/cli/templates/sample_hooks/pre-deploy.sample

@@ -0,0 +1,109 @@
+#!/usr/bin/env ruby
+
+# A sample pre-deploy hook
+#
+# Checks the Github status of the build, waiting for a pending build to complete for up to 720 seconds.
+#
+# Fails unless the combined status is "success"
+#
+# These environment variables are available:
+# KAMAL_RECORDED_AT
+# KAMAL_PERFORMER
+# KAMAL_VERSION
+# KAMAL_HOSTS
+# KAMAL_COMMAND
+# KAMAL_SUBCOMMAND
+# KAMAL_ROLE (if set)
+# KAMAL_DESTINATION (if set)
+
+# Only check the build status for production deployments
+if ENV["KAMAL_COMMAND"] == "rollback" || ENV["KAMAL_DESTINATION"] != "production"
+  exit 0
+end
+
+require "bundler/inline"
+
+# true = install gems so this is fast on repeat invocations
+gemfile(true, quiet: true) do
+  source "https://rubygems.org"
+
+  gem "octokit"
+  gem "faraday-retry"
+end
+
+MAX_ATTEMPTS = 72
+ATTEMPTS_GAP = 10
+
+def exit_with_error(message)
+  $stderr.puts message
+  exit 1
+end
+
+class GithubStatusChecks
+  attr_reader :remote_url, :git_sha, :github_client, :combined_status
+
+  def initialize
+    @remote_url = `git config --get remote.origin.url`.strip.delete_prefix("https://github.com/")
+    @git_sha = `git rev-parse HEAD`.strip
+    @github_client = Octokit::Client.new(access_token: ENV["GITHUB_TOKEN"])
+    refresh!
+  end
+
+  def refresh!
+    @combined_status = github_client.combined_status(remote_url, git_sha)
+  end
+
+  def state
+    combined_status[:state]
+  end
+
+  def first_status_url
+    first_status = combined_status[:statuses].find { |status| status[:state] == state }
+    first_status && first_status[:target_url]
+  end
+
+  def complete_count
+    combined_status[:statuses].count { |status| status[:state] != "pending"}
+  end
+
+  def total_count
+    combined_status[:statuses].count
+  end
+
+  def current_status
+    if total_count > 0
+      "Completed #{complete_count}/#{total_count} checks, see #{first_status_url} ..."
+    else
+      "Build not started..."
+    end
+  end
+end
+
+
+$stdout.sync = true
+
+puts "Checking build status..."
+attempts = 0
+checks = GithubStatusChecks.new
+
+begin
+  loop do
+    case checks.state
+    when "success"
+      puts "Checks passed, see #{checks.first_status_url}"
+      exit 0
+    when "failure"
+      exit_with_error "Checks failed, see #{checks.first_status_url}"
+    when "pending"
+      attempts += 1
+    end
+
+    exit_with_error "Checks are still pending, gave up after #{MAX_ATTEMPTS * ATTEMPTS_GAP} seconds" if attempts == MAX_ATTEMPTS
+
+    puts checks.current_status
+    sleep(ATTEMPTS_GAP)
+    checks.refresh!
+  end
+rescue Octokit::NotFound
+  exit_with_error "Build status could not be found"
+end

lib/kamal/cli/templates/sample_hooks/pre-traefik-reboot.sample

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+echo "Rebooting proxy on $KAMAL_HOSTS..."

lib/kamal/cli/templates/template.env

@@ -0,0 +1,2 @@
+KAMAL_REGISTRY_PASSWORD=change-this
+RAILS_MASTER_KEY=another-env

lib/kamal/commander.rb

@@ -0,0 +1,184 @@
+require "active_support/core_ext/enumerable"
+require "active_support/core_ext/module/delegation"
+
+class Kamal::Commander
+  attr_accessor :verbosity, :holding_lock, :hold_lock_on_error
+
+  def initialize
+    self.verbosity = :info
+    self.holding_lock = false
+    self.hold_lock_on_error = false
+  end
+
+  def config
+    @config ||= Kamal::Configuration.create_from(**@config_kwargs).tap do |config|
+      @config_kwargs = nil
+      configure_sshkit_with(config)
+    end
+  end
+
+  def configure(**kwargs)
+    @config, @config_kwargs = nil, kwargs
+  end
+
+  attr_reader :specific_roles, :specific_hosts
+
+  def specific_primary!
+    self.specific_hosts = [ config.primary_host ]
+  end
+
+  def specific_roles=(role_names)
+    if role_names.present?
+      @specific_roles = Kamal::Utils.filter_specific_items(role_names, config.roles)
+
+      if @specific_roles.empty?
+        raise ArgumentError, "No --roles match for #{role_names.join(',')}"
+      end
+
+      @specific_roles
+    end
+  end
+
+  def specific_hosts=(hosts)
+    if hosts.present?
+      @specific_hosts = Kamal::Utils.filter_specific_items(hosts, config.all_hosts)
+
+      if @specific_hosts.empty?
+        raise ArgumentError, "No --hosts match for #{hosts.join(',')}"
+      end
+
+      @specific_hosts
+    end
+  end
+
+  def primary_host
+    # Given a list of specific roles, make an effort to match up with the primary_role
+    specific_hosts&.first || specific_roles&.detect { |role| role == config.primary_role }&.primary_host || specific_roles&.first&.primary_host || config.primary_host
+  end
+
+  def primary_role
+    roles_on(primary_host).first
+  end
+
+  def roles
+    (specific_roles || config.roles).select do |role|
+      ((specific_hosts || config.all_hosts) & role.hosts).any?
+    end
+  end
+
+  def hosts
+    (specific_hosts || config.all_hosts).select do |host|
+      (specific_roles || config.roles).flat_map(&:hosts).include?(host)
+    end
+  end
+
+  def roles_on(host)
+    roles.select { |role| role.hosts.include?(host.to_s) }
+  end
+
+  def proxy_hosts
+    specific_hosts || config.proxy_hosts
+  end
+
+  def accessory_hosts
+    specific_hosts || config.accessories.flat_map(&:hosts)
+  end
+
+  def accessory_names
+    config.accessories&.collect(&:name) || []
+  end
+
+  def accessories_on(host)
+    config.accessories.select { |accessory| accessory.hosts.include?(host.to_s) }.map(&:name)
+  end
+
+
+  def app(role: nil)
+    Kamal::Commands::App.new(config, role: role)
+  end
+
+  def accessory(name)
+    Kamal::Commands::Accessory.new(config, name: name)
+  end
+
+  def auditor(**details)
+    Kamal::Commands::Auditor.new(config, **details)
+  end
+
+  def builder
+    @builder ||= Kamal::Commands::Builder.new(config)
+  end
+
+  def docker
+    @docker ||= Kamal::Commands::Docker.new(config)
+  end
+
+  def healthcheck
+    @healthcheck ||= Kamal::Commands::Healthcheck.new(config)
+  end
+
+  def hook
+    @hook ||= Kamal::Commands::Hook.new(config)
+  end
+
+  def lock
+    @lock ||= Kamal::Commands::Lock.new(config)
+  end
+
+  def prune
+    @prune ||= Kamal::Commands::Prune.new(config)
+  end
+
+  def registry
+    @registry ||= Kamal::Commands::Registry.new(config)
+  end
+
+  def server
+    @server ||= Kamal::Commands::Server.new(config)
+  end
+
+  def proxy
+    @proxy ||= Kamal::Commands::Proxy.new(config)
+  end
+
+
+  def with_verbosity(level)
+    old_level = self.verbosity
+
+    self.verbosity = level
+    SSHKit.config.output_verbosity = level
+
+    yield
+  ensure
+    self.verbosity = old_level
+    SSHKit.config.output_verbosity = old_level
+  end
+
+  def boot_strategy
+    if config.boot.limit.present?
+      { in: :groups, limit: config.boot.limit, wait: config.boot.wait }
+    else
+      {}
+    end
+  end
+
+  def holding_lock?
+    self.holding_lock
+  end
+
+  def hold_lock_on_error?
+    self.hold_lock_on_error
+  end
+
+  private
+    # Lazy setup of SSHKit
+    def configure_sshkit_with(config)
+      SSHKit::Backend::Netssh.pool.idle_timeout = config.sshkit.pool_idle_timeout
+      SSHKit::Backend::Netssh.configure do |sshkit|
+        sshkit.max_concurrent_starts = config.sshkit.max_concurrent_starts
+        sshkit.ssh_options = config.ssh.options
+      end
+      SSHKit.config.command_map[:docker] = "docker" # No need to use /usr/bin/env, just clogs up the logs
+      SSHKit.config.output_verbosity = verbosity
+    end
+end

lib/kamal/commands.rb

@@ -0,0 +1,2 @@
+module Kamal::Commands
+end

lib/kamal/commands/accessory.rb

@@ -1,4 +1,4 @@
-class Mrsk::Commands::Accessory < Mrsk::Commands::Base
+class Kamal::Commands::Accessory < Kamal::Commands::Base
   attr_reader :accessory_config
   delegate :service_name, :image, :hosts, :port, :files, :directories, :cmd,
            :publish_args, :env_args, :volume_args, :label_args, :option_args, to: :accessory_config
@@ -86,14 +86,6 @@ class Mrsk::Commands::Accessory < Mrsk::Commands::Base
     end
   end
 
-  def make_directory_for(remote_file)
-    make_directory Pathname.new(remote_file).dirname.to_s
-  end
-
-  def make_directory(path)
-    [ :mkdir, "-p", path ]
-  end
-
   def remove_service_directory
     [ :rm, "-rf", service_name ]
   end
@@ -106,6 +98,14 @@ class Mrsk::Commands::Accessory < Mrsk::Commands::Base
     docker :image, :rm, "--force", image
   end
 
+  def make_env_directory
+    make_directory accessory_config.env.secrets_directory
+  end
+
+  def remove_env_file
+    [ :rm, "-f", accessory_config.env.secrets_file ]
+  end
+
   private
     def service_filter
       [ "--filter", "label=service=#{service_name}" ]

lib/kamal/commands/app.rb

@@ -0,0 +1,98 @@
+class Kamal::Commands::App < Kamal::Commands::Base
+  include Assets, Containers, Execution, Images, Logging
+
+  ACTIVE_DOCKER_STATUSES = [ :running, :restarting ]
+
+  attr_reader :role, :role
+
+  def initialize(config, role: nil)
+    super(config)
+    @role = role
+  end
+
+  def run(hostname: nil)
+    docker :run,
+      "--detach",
+      "--restart unless-stopped",
+      "--name", container_name,
+      "--network kamal",
+      *([ "--hostname", hostname ] if hostname),
+      "-e", "KAMAL_CONTAINER_NAME=\"#{container_name}\"",
+      "-e", "KAMAL_VERSION=\"#{config.version}\"",
+      *role.env_args,
+      *role.health_check_args,
+      *role.logging_args,
+      *config.volume_args,
+      *role.asset_volume_args,
+      *role.label_args,
+      *role.option_args,
+      config.absolute_image,
+      role.cmd
+  end
+
+  def start
+    docker :start, container_name
+  end
+
+  def status(version:)
+    pipe container_id_for_version(version), xargs(docker(:inspect, "--format", DOCKER_HEALTH_STATUS_FORMAT))
+  end
+
+  def stop(version: nil)
+    pipe \
+      version ? container_id_for_version(version) : current_running_container_id,
+      xargs(config.stop_wait_time ? docker(:stop, "-t", config.stop_wait_time) : docker(:stop))
+  end
+
+  def info
+    docker :ps, *filter_args
+  end
+
+
+  def current_running_container_id
+    docker :ps, "--quiet", *filter_args(statuses: ACTIVE_DOCKER_STATUSES), "--latest"
+  end
+
+  def container_id_for_version(version, only_running: false)
+    container_id_for(container_name: container_name(version), only_running: only_running)
+  end
+
+  def container_name(version = nil)
+    [ role.container_prefix, version || config.version ].compact.join("-")
+  end
+
+  def current_running_version
+    list_versions("--latest", statuses: ACTIVE_DOCKER_STATUSES)
+  end
+
+  def list_versions(*docker_args, statuses: nil)
+    pipe \
+      docker(:ps, *filter_args(statuses: statuses), *docker_args, "--format", '"{{.Names}}"'),
+      %(while read line; do echo ${line##{role.container_prefix}-}; done) # Extract SHA from "service-role-dest-SHA"
+  end
+
+
+  def make_env_directory
+    make_directory role.env.secrets_directory
+  end
+
+  def remove_env_file
+    [ :rm, "-f", role.env.secrets_file ]
+  end
+
+
+  private
+    def filter_args(statuses: nil)
+      argumentize "--filter", filters(statuses: statuses)
+    end
+
+    def filters(statuses: nil)
+      [ "label=service=#{config.service}" ].tap do |filters|
+        filters << "label=destination=#{config.destination}" if config.destination
+        filters << "label=role=#{role}" if role
+        statuses&.each do |status|
+          filters << "status=#{status}"
+        end
+      end
+    end
+end

lib/kamal/commands/app/assets.rb

@@ -0,0 +1,51 @@
+module Kamal::Commands::App::Assets
+  def extract_assets
+    asset_container = "#{role.container_prefix}-assets"
+
+    combine \
+      make_directory(role.asset_extracted_path),
+      [ *docker(:stop, "-t 1", asset_container, "2> /dev/null"), "|| true" ],
+      docker(:run, "--name", asset_container, "--detach", "--rm", config.latest_image, "sleep 1000000"),
+      docker(:cp, "-L", "#{asset_container}:#{role.asset_path}/.", role.asset_extracted_path),
+      docker(:stop, "-t 1", asset_container),
+      by: "&&"
+  end
+
+  def sync_asset_volumes(old_version: nil)
+    new_extracted_path, new_volume_path = role.asset_extracted_path(config.version), role.asset_volume.host_path
+    if old_version.present?
+      old_extracted_path, old_volume_path = role.asset_extracted_path(old_version), role.asset_volume(old_version).host_path
+    end
+
+    commands = [ make_directory(new_volume_path), copy_contents(new_extracted_path, new_volume_path) ]
+
+    if old_version.present?
+      commands << copy_contents(new_extracted_path, old_volume_path, continue_on_error: true)
+      commands << copy_contents(old_extracted_path, new_volume_path, continue_on_error: true)
+    end
+
+    chain *commands
+  end
+
+  def clean_up_assets
+    chain \
+      find_and_remove_older_siblings(role.asset_extracted_path),
+      find_and_remove_older_siblings(role.asset_volume_path)
+  end
+
+  private
+    def find_and_remove_older_siblings(path)
+      [
+        :find,
+        Pathname.new(path).dirname.to_s,
+        "-maxdepth 1",
+        "-name", "'#{role.container_prefix}-*'",
+        "!", "-name", Pathname.new(path).basename.to_s,
+        "-exec rm -rf \"{}\" +"
+      ]
+    end
+
+    def copy_contents(source, destination, continue_on_error: false)
+      [ :cp, "-rnT", "#{source}", destination, *("|| true" if continue_on_error) ]
+    end
+end

lib/kamal/commands/app/containers.rb

@@ -0,0 +1,23 @@
+module Kamal::Commands::App::Containers
+  def list_containers
+    docker :container, :ls, "--all", *filter_args
+  end
+
+  def list_container_names
+    [ *list_containers, "--format", "'{{ .Names }}'" ]
+  end
+
+  def remove_container(version:)
+    pipe \
+      container_id_for(container_name: container_name(version)),
+      xargs(docker(:container, :rm))
+  end
+
+  def rename_container(version:, new_version:)
+    docker :rename, container_name(version), container_name(new_version)
+  end
+
+  def remove_containers
+    docker :container, :prune, "--force", *filter_args
+  end
+end

lib/kamal/commands/app/execution.rb

@@ -0,0 +1,27 @@
+module Kamal::Commands::App::Execution
+  def execute_in_existing_container(*command, interactive: false)
+    docker :exec,
+      ("-it" if interactive),
+      container_name,
+      *command
+  end
+
+  def execute_in_new_container(*command, interactive: false)
+    docker :run,
+      ("-it" if interactive),
+      "--rm",
+      *role&.env_args,
+      *config.volume_args,
+      *role&.option_args,
+      config.absolute_image,
+      *command
+  end
+
+  def execute_in_existing_container_over_ssh(*command, host:)
+    run_over_ssh execute_in_existing_container(*command, interactive: true), host: host
+  end
+
+  def execute_in_new_container_over_ssh(*command, host:)
+    run_over_ssh execute_in_new_container(*command, interactive: true), host: host
+  end
+end

lib/kamal/commands/app/images.rb

@@ -0,0 +1,13 @@
+module Kamal::Commands::App::Images
+  def list_images
+    docker :image, :ls, config.repository
+  end
+
+  def remove_images
+    docker :image, :prune, "--all", "--force", *filter_args
+  end
+
+  def tag_current_image_as_latest
+    docker :tag, config.absolute_image, config.latest_image
+  end
+end

lib/kamal/commands/app/logging.rb

@@ -0,0 +1,18 @@
+module Kamal::Commands::App::Logging
+  def logs(since: nil, lines: nil, grep: nil)
+    pipe \
+      current_running_container_id,
+      "xargs docker logs#{" --since #{since}" if since}#{" --tail #{lines}" if lines} 2>&1",
+      ("grep '#{grep}'" if grep)
+  end
+
+  def follow_logs(host:, lines: nil, grep: nil)
+    run_over_ssh \
+      pipe(
+        current_running_container_id,
+        "xargs docker logs --timestamps#{" --tail #{lines}" if lines} --follow 2>&1",
+        (%(grep "#{grep}") if grep)
+      ),
+      host: host
+  end
+end

lib/kamal/commands/auditor.rb

@@ -1,4 +1,4 @@
-class Mrsk::Commands::Auditor < Mrsk::Commands::Base
+class Kamal::Commands::Auditor < Kamal::Commands::Base
   attr_reader :details
 
   def initialize(config, **details)
@@ -19,7 +19,9 @@ class Mrsk::Commands::Auditor < Mrsk::Commands::Base
 
   private
     def audit_log_file
-      [ "mrsk", config.service, config.destination, "audit.log" ].compact.join("-")
+      file = [ config.service, config.destination, "audit.log" ].compact.join("-")
+
+      "#{config.run_directory}/#{file}"
     end
 
     def audit_tags(**details)

lib/kamal/commands/base.rb

@@ -1,6 +1,6 @@
-module Mrsk::Commands
+module Kamal::Commands
   class Base
-    delegate :sensitive, :argumentize, to: Mrsk::Utils
+    delegate :sensitive, :argumentize, to: Kamal::Utils
 
     DOCKER_HEALTH_STATUS_FORMAT = "'{{if .State.Health}}{{.State.Health.Status}}{{else}}{{.State.Status}}{{end}}'"
     DOCKER_HEALTH_LOG_FORMAT    = "'{{json .State.Health}}'"
@@ -13,8 +13,12 @@ module Mrsk::Commands
 
     def run_over_ssh(*command, host:)
       "ssh".tap do |cmd|
-        cmd << " -J #{config.ssh_proxy.jump_proxies}" if config.ssh_proxy
+        if config.ssh.proxy && config.ssh.proxy.is_a?(Net::SSH::Proxy::Jump)
-        cmd << " -t #{config.ssh_user}@#{host} '#{command.join(" ")}'"
+          cmd << " -J #{config.ssh.proxy.jump_proxies}"
+        elsif config.ssh.proxy && config.ssh.proxy.is_a?(Net::SSH::Proxy::Command)
+          cmd << " -o ProxyCommand='#{config.ssh.proxy.command_line_template}'"
+        end
+        cmd << " -t #{config.ssh.user}@#{host} -p #{config.ssh.port} '#{command.join(" ")}'"
       end
     end
 
@@ -22,6 +26,18 @@ module Mrsk::Commands
       docker :container, :ls, *("--all" unless only_running), "--filter", "name=^#{container_name}$", "--quiet"
     end
 
+    def make_directory_for(remote_file)
+      make_directory Pathname.new(remote_file).dirname.to_s
+    end
+
+    def make_directory(path)
+      [ :mkdir, "-p", path ]
+    end
+
+    def remove_directory(path)
+      [ :rm, "-r", path ]
+    end
+
     private
       def combine(*commands, by: "&&")
         commands
@@ -46,16 +62,28 @@ module Mrsk::Commands
         combine *commands, by: ">"
       end
 
+      def any(*commands)
+        combine *commands, by: "||"
+      end
+
       def xargs(command)
         [ :xargs, command ].flatten
       end
 
+      def shell(command)
+        [ :sh, "-c", "'#{command.flatten.join(" ").gsub("'", "'\\''")}'" ]
+      end
+
       def docker(*args)
         args.compact.unshift :docker
       end
 
+      def git(*args)
+        args.compact.unshift :git
+      end
+
       def tags(**details)
-        Mrsk::Tags.from_config(config, **details)
+        Kamal::Tags.from_config(config, **details)
       end
   end
 end

lib/kamal/commands/builder.rb

@@ -0,0 +1,64 @@
+require "active_support/core_ext/string/filters"
+
+class Kamal::Commands::Builder < Kamal::Commands::Base
+  delegate :create, :remove, :push, :clean, :pull, :info, :validate_image, to: :target
+
+  def name
+    target.class.to_s.remove("Kamal::Commands::Builder::").underscore.inquiry
+  end
+
+  def target
+    case
+    when !config.builder.multiarch? && !config.builder.cached?
+      native
+    when !config.builder.multiarch? && config.builder.cached?
+      native_cached
+    when config.builder.local? && config.builder.remote?
+      multiarch_remote
+    when config.builder.remote?
+      native_remote
+    else
+      multiarch
+    end
+  end
+
+  def native
+    @native ||= Kamal::Commands::Builder::Native.new(config)
+  end
+
+  def native_cached
+    @native ||= Kamal::Commands::Builder::Native::Cached.new(config)
+  end
+
+  def native_remote
+    @native ||= Kamal::Commands::Builder::Native::Remote.new(config)
+  end
+
+  def multiarch
+    @multiarch ||= Kamal::Commands::Builder::Multiarch.new(config)
+  end
+
+  def multiarch_remote
+    @multiarch_remote ||= Kamal::Commands::Builder::Multiarch::Remote.new(config)
+  end
+
+
+  def ensure_local_dependencies_installed
+    if name.native?
+      ensure_local_docker_installed
+    else
+      combine \
+        ensure_local_docker_installed,
+        ensure_local_buildx_installed
+    end
+  end
+
+  private
+    def ensure_local_docker_installed
+      docker "--version"
+    end
+
+    def ensure_local_buildx_installed
+      docker :buildx, "version"
+    end
+end

lib/kamal/commands/builder/base.rb

@@ -0,0 +1,83 @@
+
+class Kamal::Commands::Builder::Base < Kamal::Commands::Base
+  class BuilderError < StandardError; end
+
+  delegate :argumentize, to: Kamal::Utils
+  delegate :args, :secrets, :dockerfile, :local_arch, :local_host, :remote_arch, :remote_host, :cache_from, :cache_to, :ssh, :git_archive?, to: :builder_config
+
+  def clean
+    docker :image, :rm, "--force", config.absolute_image
+  end
+
+  def pull
+    docker :pull, config.absolute_image
+  end
+
+  def push
+    if git_archive?
+      pipe \
+        git(:archive, "--format=tar", :HEAD),
+        build_and_push
+    else
+      build_and_push
+    end
+  end
+
+  def build_options
+    [ *build_tags, *build_cache, *build_labels, *build_args, *build_secrets, *build_dockerfile, *build_ssh ]
+  end
+
+  def build_context
+    config.builder.context
+  end
+
+  def validate_image
+    pipe \
+      docker(:inspect, "-f", "'{{ .Config.Labels.service }}'", config.absolute_image),
+      any(
+        [ :grep, "-x", config.service ],
+        "(echo \"Image #{config.absolute_image} is missing the 'service' label\" && exit 1)"
+      )
+  end
+
+
+  private
+    def build_tags
+      [ "-t", config.absolute_image, "-t", config.latest_image ]
+    end
+
+    def build_cache
+      if cache_to && cache_from
+        [ "--cache-to", cache_to,
+          "--cache-from", cache_from ]
+      end
+    end
+
+    def build_labels
+      argumentize "--label", { service: config.service }
+    end
+
+    def build_args
+      argumentize "--build-arg", args, sensitive: true
+    end
+
+    def build_secrets
+      argumentize "--secret", secrets.collect { |secret| [ "id", secret ] }
+    end
+
+    def build_dockerfile
+      if Pathname.new(File.expand_path(dockerfile)).exist?
+        argumentize "--file", dockerfile
+      else
+        raise BuilderError, "Missing #{dockerfile}"
+      end
+    end
+
+    def build_ssh
+      argumentize "--ssh", ssh if ssh.present?
+    end
+
+    def builder_config
+      config.builder
+    end
+end

lib/kamal/commands/builder/multiarch.rb

@@ -0,0 +1,37 @@
+class Kamal::Commands::Builder::Multiarch < Kamal::Commands::Builder::Base
+  def create
+    docker :buildx, :create, "--use", "--name", builder_name
+  end
+
+  def remove
+    docker :buildx, :rm, builder_name
+  end
+
+  def info
+    combine \
+      docker(:context, :ls),
+      docker(:buildx, :ls)
+  end
+
+  private
+    def builder_name
+      "kamal-#{config.service}-multiarch"
+    end
+
+    def platform_names
+      if local_arch
+        "linux/#{local_arch}"
+      else
+        "linux/amd64,linux/arm64"
+      end
+    end
+
+    def build_and_push
+      docker :buildx, :build,
+        "--push",
+        "--platform", platform_names,
+        "--builder", builder_name,
+        *build_options,
+        build_context
+    end
+end

lib/kamal/commands/builder/multiarch/remote.rb

@@ -1,4 +1,4 @@
-class Mrsk::Commands::Builder::Multiarch::Remote < Mrsk::Commands::Builder::Multiarch
+class Kamal::Commands::Builder::Multiarch::Remote < Kamal::Commands::Builder::Multiarch
   def create
     combine \
       create_contexts,
@@ -22,17 +22,17 @@ class Mrsk::Commands::Builder::Multiarch::Remote < Mrsk::Commands::Builder::Mult
     end
 
     def create_local_buildx
-      docker :buildx, :create, "--name", builder_name, builder_name_with_arch(local["arch"]), "--platform", "linux/#{local["arch"]}"
+      docker :buildx, :create, "--name", builder_name, builder_name_with_arch(local_arch), "--platform", "linux/#{local_arch}"
     end
 
     def append_remote_buildx
-      docker :buildx, :create, "--append", "--name", builder_name, builder_name_with_arch(remote["arch"]), "--platform", "linux/#{remote["arch"]}"
+      docker :buildx, :create, "--append", "--name", builder_name, builder_name_with_arch(remote_arch), "--platform", "linux/#{remote_arch}"
     end
 
     def create_contexts
       combine \
-        create_context(local["arch"], local["host"]),
+        create_context(local_arch, local_host),
-        create_context(remote["arch"], remote["host"])
+        create_context(remote_arch, remote_host)
     end
 
     def create_context(arch, host)
@@ -41,19 +41,11 @@ class Mrsk::Commands::Builder::Multiarch::Remote < Mrsk::Commands::Builder::Mult
 
     def remove_contexts
       combine \
-        remove_context(local["arch"]),
+        remove_context(local_arch),
-        remove_context(remote["arch"])
+        remove_context(remote_arch)
     end
 
     def remove_context(arch)
       docker :context, :rm, builder_name_with_arch(arch)
     end
-
-    def local
-      config.builder["local"]
-    end
-
-    def remote
-      config.builder["remote"]
-    end
 end

lib/kamal/commands/builder/native.rb

@@ -0,0 +1,21 @@
+class Kamal::Commands::Builder::Native < Kamal::Commands::Builder::Base
+  def create
+    # No-op on native without cache
+  end
+
+  def remove
+    # No-op on native without cache
+  end
+
+  def info
+    # No-op on native
+  end
+
+  private
+    def build_and_push
+      combine \
+        docker(:build, *build_options, build_context),
+        docker(:push, config.absolute_image),
+        docker(:push, config.latest_image)
+    end
+end

lib/kamal/commands/builder/native/cached.rb

@@ -0,0 +1,17 @@
+class Kamal::Commands::Builder::Native::Cached < Kamal::Commands::Builder::Native
+  def create
+    docker :buildx, :create, "--use", "--driver=docker-container"
+  end
+
+  def remove
+    docker :buildx, :rm, builder_name
+  end
+
+  private
+    def build_and_push
+      docker :buildx, :build,
+        "--push",
+        *build_options,
+        build_context
+    end
+end

lib/kamal/commands/builder/native/remote.rb

@@ -1,4 +1,4 @@
-class Mrsk::Commands::Builder::Native::Remote < Mrsk::Commands::Builder::Native
+class Kamal::Commands::Builder::Native::Remote < Kamal::Commands::Builder::Native
   def create
     chain \
       create_context,
@@ -11,15 +11,6 @@ class Mrsk::Commands::Builder::Native::Remote < Mrsk::Commands::Builder::Native
       remove_buildx
   end
 
-  def push
-    docker :buildx, :build,
-      "--push",
-      "--platform", platform,
-      "--builder", builder_name,
-      *build_options,
-      build_context
-  end
-
   def info
     chain \
       docker(:context, :ls),
@@ -28,29 +19,21 @@ class Mrsk::Commands::Builder::Native::Remote < Mrsk::Commands::Builder::Native
 
 
   private
-    def arch
-      config.builder["remote"]["arch"]
-    end
-
-    def host
-      config.builder["remote"]["host"]
-    end
-
     def builder_name
-      "mrsk-#{config.service}-native-remote"
+      "kamal-#{config.service}-native-remote"
     end
 
     def builder_name_with_arch
-      "#{builder_name}-#{arch}"
+      "#{builder_name}-#{remote_arch}"
     end
 
     def platform
-      "linux/#{arch}"
+      "linux/#{remote_arch}"
     end
 
     def create_context
       docker :context, :create,
-        builder_name_with_arch, "--description", "'#{builder_name} #{arch} native host'", "--docker", "'host=#{host}'"
+        builder_name_with_arch, "--description", "'#{builder_name} #{remote_arch} native host'", "--docker", "'host=#{remote_host}'"
     end
 
     def remove_context
@@ -64,4 +47,13 @@ class Mrsk::Commands::Builder::Native::Remote < Mrsk::Commands::Builder::Native
     def remove_buildx
       docker :buildx, :rm, builder_name
     end
+
+    def build_and_push
+      docker :buildx, :build,
+      "--push",
+      "--platform", platform,
+      "--builder", builder_name,
+      *build_options,
+      build_context
+    end
 end

lib/kamal/commands/docker.rb

@@ -0,0 +1,34 @@
+class Kamal::Commands::Docker < Kamal::Commands::Base
+  # Install Docker using the https://github.com/docker/docker-install convenience script.
+  def install
+    pipe get_docker, :sh
+  end
+
+  # Checks the Docker client version. Fails if Docker is not installed.
+  def installed?
+    docker "-v"
+  end
+
+  # Checks the Docker server version. Fails if Docker is not running.
+  def running?
+    docker :version
+  end
+
+  # Do we have superuser access to install Docker and start system services?
+  def superuser?
+    [ '[ "${EUID:-$(id -u)}" -eq 0 ] || command -v sudo >/dev/null || command -v su >/dev/null' ]
+  end
+
+  def create_kamal_network
+    docker :network, :create, :kamal
+  end
+
+  private
+    def get_docker
+      shell \
+        any \
+          [ :curl, "-fsSL", "https://get.docker.com" ],
+          [ :wget, "-O -", "https://get.docker.com" ],
+          [ :echo, "\"exit 1\"" ]
+    end
+end

lib/kamal/commands/healthcheck.rb

@@ -1,21 +1,19 @@
-class Mrsk::Commands::Healthcheck < Mrsk::Commands::Base
+class Kamal::Commands::Healthcheck < Kamal::Commands::Base
-  EXPOSED_PORT = 3999
-
   def run
-    web = config.role(:web)
+    primary = config.role(config.primary_role)
 
     docker :run,
       "--detach",
       "--name", container_name_with_version,
-      "--publish", "#{EXPOSED_PORT}:#{config.healthcheck["port"]}",
+      "--publish", "#{exposed_port}:#{config.healthcheck["port"]}",
-      "--label", "service=#{container_name}",
+      "--label", "service=#{config.healthcheck_service}",
-      "-e", "MRSK_CONTAINER_NAME=\"#{container_name}\"",
+      "-e", "KAMAL_CONTAINER_NAME=\"#{config.healthcheck_service}\"",
-      *web.env_args,
+      *primary.env_args,
-      *web.health_check_args,
+      *primary.health_check_args,
       *config.volume_args,
-      *web.option_args,
+      *primary.option_args,
       config.absolute_image,
-      web.cmd
+      primary.cmd
   end
 
   def status
@@ -27,7 +25,7 @@ class Mrsk::Commands::Healthcheck < Mrsk::Commands::Base
   end
 
   def logs
-    pipe container_id, xargs(docker(:logs, "--tail", 50, "2>&1"))
+    pipe container_id, xargs(docker(:logs, "--tail", log_lines, "2>&1"))
   end
 
   def stop
@@ -39,12 +37,8 @@ class Mrsk::Commands::Healthcheck < Mrsk::Commands::Base
   end
 
   private
-    def container_name
-      [ "healthcheck", config.service, config.destination ].compact.join("-")
-    end
-
     def container_name_with_version
-      "#{container_name}-#{config.version}"
+      "#{config.healthcheck_service}-#{config.version}"
     end
 
     def container_id
@@ -52,6 +46,14 @@ class Mrsk::Commands::Healthcheck < Mrsk::Commands::Base
     end
 
     def health_url
-      "http://localhost:#{EXPOSED_PORT}#{config.healthcheck["path"]}"
+      "http://localhost:#{exposed_port}#{config.healthcheck["path"]}"
+    end
+
+    def exposed_port
+      config.healthcheck["exposed_port"]
+    end
+
+    def log_lines
+      config.healthcheck["log_lines"]
     end
 end

lib/kamal/commands/hook.rb

@@ -1,4 +1,4 @@
-class Mrsk::Commands::Hook < Mrsk::Commands::Base
+class Kamal::Commands::Hook < Kamal::Commands::Base
   def run(hook, **details)
     [ hook_file(hook), env: tags(**details).env ]
   end

lib/kamal/commands/lock.rb

@@ -1,17 +1,18 @@
 require "active_support/duration"
 require "time"
+require "base64"
 
-class Mrsk::Commands::Lock < Mrsk::Commands::Base
+class Kamal::Commands::Lock < Kamal::Commands::Base
   def acquire(message, version)
     combine \
-      [:mkdir, lock_dir],
+      [ :mkdir, lock_dir ],
       write_lock_details(message, version)
   end
 
   def release
     combine \
-      [:rm, lock_details_file],
+      [ :rm, lock_details_file ],
-      [:rm, "-r", lock_dir]
+      [ :rm, "-r", lock_dir ]
   end
 
   def status
@@ -20,31 +21,41 @@ class Mrsk::Commands::Lock < Mrsk::Commands::Base
       read_lock_details
   end
 
+  def ensure_locks_directory
+    [ :mkdir, "-p", locks_dir ]
+  end
+
   private
     def write_lock_details(message, version)
       write \
-        [:echo, "\"#{Base64.encode64(lock_details(message, version))}\""],
+        [ :echo, "\"#{Base64.encode64(lock_details(message, version))}\"" ],
         lock_details_file
     end
 
     def read_lock_details
       pipe \
-        [:cat, lock_details_file],
+        [ :cat, lock_details_file ],
-        [:base64, "-d"]
+        [ :base64, "-d" ]
     end
 
     def stat_lock_dir
       write \
-        [:stat, lock_dir],
+        [ :stat, lock_dir ],
         "/dev/null"
     end
 
+    def locks_dir
+      File.join(config.run_directory, "locks")
+    end
+
     def lock_dir
-      :mrsk_lock
+      dir_name = [ config.service, config.destination ].compact.join("-")
+
+      File.join(locks_dir, dir_name)
     end
 
     def lock_details_file
-      [lock_dir, :details].join("/")
+      File.join(lock_dir, "details")
     end
 
     def lock_details(message, version)
@@ -56,7 +67,7 @@ class Mrsk::Commands::Lock < Mrsk::Commands::Base
     end
 
     def locked_by
-      `git config user.name`.strip
+      Kamal::Git.user_name
     rescue Errno::ENOENT
       "Unknown"
     end

lib/kamal/commands/proxy.rb

@@ -0,0 +1,116 @@
+class Kamal::Commands::Proxy < Kamal::Commands::Base
+  CONTAINER_PORT = 80
+
+  delegate :argumentize, :optionize, to: Kamal::Utils
+
+  DEFAULT_IMAGE = "dmcbreen/mproxy:latest"
+
+  def run
+    docker :run,
+      "--name", container_name,
+      "--detach",
+      "--restart", "unless-stopped",
+      "--network kamal",
+      *publish_args,
+      "--volume", "/var/run/docker.sock:/var/run/docker.sock",
+      *config.logging_args,
+      *label_args,
+      *docker_options_args,
+      image,
+      *cmd_option_args
+  end
+
+  def start
+    docker :container, :start, container_name
+  end
+
+  def stop
+    docker :container, :stop, container_name
+  end
+
+  def start_or_run
+    combine start, run, by: "||"
+  end
+
+  def deploy(version)
+    docker :exec, container_name, :mproxy, :deploy, version
+  end
+
+  def remove(version)
+    docker :exec, container_name, :mproxy, :remove, version
+  end
+
+  def info
+    docker :ps, "--filter", "name=^#{container_name}$"
+  end
+
+  def logs(since: nil, lines: nil, grep: nil)
+    pipe \
+      docker(:logs, container_name, (" --since #{since}" if since), (" --tail #{lines}" if lines), "--timestamps", "2>&1"),
+      ("grep '#{grep}'" if grep)
+  end
+
+  def follow_logs(host:, grep: nil)
+    run_over_ssh pipe(
+      docker(:logs, container_name, "--timestamps", "--tail", "10", "--follow", "2>&1"),
+      (%(grep "#{grep}") if grep)
+    ).join(" "), host: host
+  end
+
+  def remove_container
+    docker :container, :prune, "--force", "--filter", container_filter
+  end
+
+  def remove_image
+    docker :image, :prune, "--all", "--force", "--filter", image_filter
+  end
+
+  def port
+    "#{host_port}:#{CONTAINER_PORT}"
+  end
+
+  private
+    def container_filter
+      "label=org.opencontainers.image.title=mproxy"
+    end
+
+    def image_filter
+      "label=org.opencontainers.image.title=mproxy"
+    end
+
+    def publish_args
+      argumentize "--publish", port unless config.proxy["publish"] == false
+    end
+
+    def label_args
+      argumentize "--label", labels
+    end
+
+    def labels
+      config.proxy["labels"] || {}
+    end
+
+    def image
+      config.proxy.fetch("image") { DEFAULT_IMAGE }
+    end
+
+    def docker_options_args
+      optionize(config.proxy["options"] || {})
+    end
+
+    def cmd_option_args
+      optionize cmd_args, with: "="
+    end
+
+    def cmd_args
+      config.proxy["args"] || {}
+    end
+
+    def host_port
+      config.proxy["host_port"] || CONTAINER_PORT
+    end
+
+    def container_name
+      "mproxy"
+    end
+end

lib/kamal/commands/prune.rb

@@ -0,0 +1,46 @@
+require "active_support/duration"
+require "active_support/core_ext/numeric/time"
+
+class Kamal::Commands::Prune < Kamal::Commands::Base
+  def dangling_images
+    docker :image, :prune, "--force", "--filter", "label=service=#{config.service}"
+  end
+
+  def tagged_images
+    pipe \
+      docker(:image, :ls, *service_filter, "--format", "'{{.ID}} {{.Repository}}:{{.Tag}}'"),
+      "grep -v -w \"#{active_image_list}\"",
+      "while read image tag; do docker rmi $tag; done"
+  end
+
+  def app_containers(retain:)
+    pipe \
+      docker(:ps, "-q", "-a", *service_filter, *stopped_containers_filters),
+      "tail -n +#{retain + 1}",
+      "while read container_id; do docker rm $container_id; done"
+  end
+
+  def healthcheck_containers
+    docker :container, :prune, "--force", *healthcheck_service_filter
+  end
+
+  private
+    def stopped_containers_filters
+      [ "created", "exited", "dead" ].flat_map { |status| [ "--filter", "status=#{status}" ] }
+    end
+
+    def active_image_list
+      # Pull the images that are used by any containers
+      # Append repo:latest - to avoid deleting the latest tag
+      # Append repo:<none> - to avoid deleting dangling images that are in use. Unused dangling images are deleted separately
+      "$(docker container ls -a --format '{{.Image}}\\|' --filter label=service=#{config.service} | tr -d '\\n')#{config.latest_image}\\|#{config.repository}:<none>"
+    end
+
+    def service_filter
+      [ "--filter", "label=service=#{config.service}" ]
+    end
+
+    def healthcheck_service_filter
+      [ "--filter", "label=service=#{config.healthcheck_service}" ]
+    end
+end

lib/kamal/commands/registry.rb

@@ -1,8 +1,11 @@
-class Mrsk::Commands::Registry < Mrsk::Commands::Base
+class Kamal::Commands::Registry < Kamal::Commands::Base
   delegate :registry, to: :config
 
   def login
-    docker :login, registry["server"], "-u", sensitive(lookup("username")), "-p", sensitive(lookup("password"))
+    docker :login,
+      registry["server"],
+      "-u", sensitive(Kamal::Utils.escape_shell_value(lookup("username"))),
+      "-p", sensitive(Kamal::Utils.escape_shell_value(lookup("password")))
   end
 
   def logout

lib/kamal/commands/server.rb

@@ -0,0 +1,5 @@
+class Kamal::Commands::Server < Kamal::Commands::Base
+  def ensure_run_directory
+    [ :mkdir, "-p", config.run_directory ]
+  end
+end

lib/kamal/configuration.rb

@@ -0,0 +1,335 @@
+require "active_support/ordered_options"
+require "active_support/core_ext/string/inquiry"
+require "active_support/core_ext/module/delegation"
+require "pathname"
+require "erb"
+require "net/ssh/proxy/jump"
+
+class Kamal::Configuration
+  delegate :service, :image, :port, :servers, :labels, :registry, :stop_wait_time, :hooks_path, :logging, to: :raw_config, allow_nil: true
+  delegate :argumentize, :optionize, to: Kamal::Utils
+
+  attr_reader :destination, :raw_config
+
+  class << self
+    def create_from(config_file:, destination: nil, version: nil)
+      raw_config = load_config_files(config_file, *destination_config_file(config_file, destination))
+
+      new raw_config, destination: destination, version: version
+    end
+
+    private
+      def load_config_files(*files)
+        files.inject({}) { |config, file| config.deep_merge! load_config_file(file) }
+      end
+
+      def load_config_file(file)
+        if file.exist?
+          # Newer Psych doesn't load aliases by default
+          load_method = YAML.respond_to?(:unsafe_load) ? :unsafe_load : :load
+          YAML.send(load_method, ERB.new(IO.read(file)).result).symbolize_keys
+        else
+          raise "Configuration file not found in #{file}"
+        end
+      end
+
+      def destination_config_file(base_config_file, destination)
+        base_config_file.sub_ext(".#{destination}.yml") if destination
+      end
+  end
+
+  def initialize(raw_config, destination: nil, version: nil, validate: true)
+    @raw_config = ActiveSupport::InheritableOptions.new(raw_config)
+    @destination = destination
+    @declared_version = version
+    valid? if validate
+  end
+
+
+  def version=(version)
+    @declared_version = version
+  end
+
+  def version
+    @declared_version.presence || ENV["VERSION"] || git_version
+  end
+
+  def abbreviated_version
+    if version
+      # Don't abbreviate <sha>_uncommitted_<etc>
+      if version.include?("_")
+        version
+      else
+        version[0...7]
+      end
+    end
+  end
+
+  def minimum_version
+    raw_config.minimum_version
+  end
+
+
+  def roles
+    @roles ||= role_names.collect { |role_name| Role.new(role_name, config: self) }
+  end
+
+  def role(name)
+    roles.detect { |r| r.name == name.to_s }
+  end
+
+  def accessories
+    @accessories ||= raw_config.accessories&.keys&.collect { |name| Kamal::Configuration::Accessory.new(name, config: self) } || []
+  end
+
+  def accessory(name)
+    accessories.detect { |a| a.name == name.to_s }
+  end
+
+
+  def all_hosts
+    roles.flat_map(&:hosts).uniq
+  end
+
+  def primary_host
+    primary_role&.primary_host
+  end
+
+  def primary_role_name
+    raw_config.primary_role || "web"
+  end
+
+  def primary_role
+    role(primary_role_name)
+  end
+
+  def allow_empty_roles?
+    raw_config.allow_empty_roles
+  end
+
+  def proxy_roles
+    roles.select(&:running_proxy?)
+  end
+
+  def proxy_role_names
+    proxy_roles.flat_map(&:name)
+  end
+
+  def proxy_hosts
+    proxy_roles.flat_map(&:hosts).uniq
+  end
+
+  def repository
+    [ raw_config.registry["server"], image ].compact.join("/")
+  end
+
+  def absolute_image
+    "#{repository}:#{version}"
+  end
+
+  def latest_image
+    "#{repository}:latest"
+  end
+
+  def service_with_version
+    "#{service}-#{version}"
+  end
+
+  def require_destination?
+    raw_config.require_destination
+  end
+
+  def retain_containers
+    raw_config.retain_containers || 5
+  end
+
+
+  def volume_args
+    if raw_config.volumes.present?
+      argumentize "--volume", raw_config.volumes
+    else
+      []
+    end
+  end
+
+  def logging_args
+    if logging.present?
+      optionize({ "log-driver" => logging["driver"] }.compact) +
+        argumentize("--log-opt", logging["options"])
+    else
+      argumentize("--log-opt", { "max-size" => "10m" })
+    end
+  end
+
+
+  def boot
+    Kamal::Configuration::Boot.new(config: self)
+  end
+
+  def builder
+    Kamal::Configuration::Builder.new(config: self)
+  end
+
+  def proxy
+    raw_config.proxy || {}
+  end
+
+  def ssh
+    Kamal::Configuration::Ssh.new(config: self)
+  end
+
+  def sshkit
+    Kamal::Configuration::Sshkit.new(config: self)
+  end
+
+
+  def healthcheck
+    { "path" => "/up", "port" => 3000, "max_attempts" => 7, "exposed_port" => 3999, "log_lines" => 50 }.merge(raw_config.healthcheck || {})
+  end
+
+  def healthcheck_service
+    [ "healthcheck", service, destination ].compact.join("-")
+  end
+
+  def readiness_delay
+    raw_config.readiness_delay || 7
+  end
+
+  def run_id
+    @run_id ||= SecureRandom.hex(16)
+  end
+
+
+  def run_directory
+    raw_config.run_directory || ".kamal"
+  end
+
+  def run_directory_as_docker_volume
+    if Pathname.new(run_directory).absolute?
+      run_directory
+    else
+      File.join "$(pwd)", run_directory
+    end
+  end
+
+  def hooks_path
+    raw_config.hooks_path || ".kamal/hooks"
+  end
+
+  def asset_path
+    raw_config.asset_path
+  end
+
+
+  def host_env_directory
+    "#{run_directory}/env"
+  end
+
+  def env
+    raw_config.env || {}
+  end
+
+
+  def valid?
+    ensure_destination_if_required && ensure_required_keys_present && ensure_valid_kamal_version && ensure_retain_containers_valid && ensure_valid_service_name
+  end
+
+  def to_h
+    {
+      roles: role_names,
+      hosts: all_hosts,
+      primary_host: primary_host,
+      version: version,
+      repository: repository,
+      absolute_image: absolute_image,
+      service_with_version: service_with_version,
+      volume_args: volume_args,
+      ssh_options: ssh.to_h,
+      sshkit: sshkit.to_h,
+      builder: builder.to_h,
+      accessories: raw_config.accessories,
+      logging: logging_args,
+      healthcheck: healthcheck
+    }.compact
+  end
+
+
+  private
+    # Will raise ArgumentError if any required config keys are missing
+    def ensure_destination_if_required
+      if require_destination? && destination.nil?
+        raise ArgumentError, "You must specify a destination"
+      end
+
+      true
+    end
+
+    def ensure_required_keys_present
+      %i[ service image registry servers ].each do |key|
+        raise ArgumentError, "Missing required configuration for #{key}" unless raw_config[key].present?
+      end
+
+      if raw_config.registry["username"].blank?
+        raise ArgumentError, "You must specify a username for the registry in config/deploy.yml"
+      end
+
+      if raw_config.registry["password"].blank?
+        raise ArgumentError, "You must specify a password for the registry in config/deploy.yml (or set the ENV variable if that's used)"
+      end
+
+      unless role_names.include?(primary_role_name)
+        raise ArgumentError, "The primary_role #{primary_role_name} isn't defined"
+      end
+
+      if primary_role.hosts.empty?
+        raise ArgumentError, "No servers specified for the #{primary_role.name} primary_role"
+      end
+
+      unless allow_empty_roles?
+        roles.each do |role|
+          if role.hosts.empty?
+            raise ArgumentError, "No servers specified for the #{role.name} role. You can ignore this with allow_empty_roles: true"
+          end
+        end
+      end
+
+      true
+    end
+
+    def ensure_valid_service_name
+      raise ArgumentError, "Service name can only include alphanumeric characters, hyphens, and underscores" unless raw_config[:service] =~ /^[a-z0-9_-]+$/
+
+      true
+    end
+
+    def ensure_valid_kamal_version
+      if minimum_version && Gem::Version.new(minimum_version) > Gem::Version.new(Kamal::VERSION)
+        raise ArgumentError, "Current version is #{Kamal::VERSION}, minimum required is #{minimum_version}"
+      end
+
+      true
+    end
+
+    def ensure_retain_containers_valid
+      raise ArgumentError, "Must retain at least 1 container" if retain_containers < 1
+
+      true
+    end
+
+
+    def role_names
+      raw_config.servers.is_a?(Array) ? [ "web" ] : raw_config.servers.keys.sort
+    end
+
+    def git_version
+      @git_version ||=
+        if Kamal::Git.used?
+          if Kamal::Git.uncommitted_changes.present? && !builder.git_archive?
+            uncommitted_suffix = "_uncommitted_#{SecureRandom.hex(8)}"
+          end
+          [ Kamal::Git.revision, uncommitted_suffix ].compact.join
+        else
+          raise "Can't use commit hash as version, no git repository found in #{Dir.pwd}"
+        end
+    end
+end

lib/kamal/configuration/accessory.rb

@@ -1,5 +1,5 @@
-class Mrsk::Configuration::Accessory
+class Kamal::Configuration::Accessory
-  delegate :argumentize, :argumentize_env_with_secrets, :optionize, to: Mrsk::Utils
+  delegate :argumentize, :optionize, to: Kamal::Utils
 
   attr_accessor :name, :specifics
 
@@ -8,7 +8,7 @@ class Mrsk::Configuration::Accessory
   end
 
   def service_name
-    "#{config.service}-#{name}"
+    specifics["service"] || "#{config.service}-#{name}"
   end
 
   def image
@@ -16,7 +16,7 @@ class Mrsk::Configuration::Accessory
   end
 
   def hosts
-    if (specifics.keys & ["host", "hosts", "roles"]).size != 1
+    if (specifics.keys & [ "host", "hosts", "roles" ]).size != 1
       raise ArgumentError, "Specify one of `host`, `hosts` or `roles` for accessory `#{name}`"
     end
 
@@ -42,11 +42,13 @@ class Mrsk::Configuration::Accessory
   end
 
   def env
-    specifics["env"] || {}
+    Kamal::Configuration::Env.from_config \
+      config: specifics.fetch("env", {}),
+      secrets_file: File.join(config.host_env_directory, "accessories", "#{service_name}.env")
   end
 
   def env_args
-    argumentize_env_with_secrets env
+    env.args
   end
 
   def files
@@ -58,8 +60,8 @@ class Mrsk::Configuration::Accessory
 
   def directories
     specifics["directories"]&.to_h do |host_to_container_mapping|
-      host_relative_path, container_path = host_to_container_mapping.split(":")
+      host_path, container_path = host_to_container_mapping.split(":")
-      [ expand_host_path(host_relative_path), container_path ]
+      [ expand_host_path(host_path), container_path ]
     end || {}
   end
 
@@ -99,10 +101,10 @@ class Mrsk::Configuration::Accessory
     end
 
     def with_clear_env_loaded
-      (env["clear"] || env).each { |k, v| ENV[k] = v }
+      env.clear.each { |k, v| ENV[k] = v }
       yield
     ensure
-      (env["clear"] || env).each { |k, v| ENV.delete(k) }
+      env.clear.each { |k, v| ENV.delete(k) }
     end
 
     def read_dynamic_file(local_file)
@@ -126,13 +128,17 @@ class Mrsk::Configuration::Accessory
 
     def remote_directories_as_volumes
       specifics["directories"]&.collect do |host_to_container_mapping|
-        host_relative_path, container_path = host_to_container_mapping.split(":")
+        host_path, container_path = host_to_container_mapping.split(":")
-        [ expand_host_path(host_relative_path), container_path ].join(":")
+        [ expand_host_path(host_path), container_path ].join(":")
       end || []
     end
 
-    def expand_host_path(host_relative_path)
+    def expand_host_path(host_path)
-      "#{service_data_directory}/#{host_relative_path}"
+      absolute_path?(host_path) ? host_path : "#{service_data_directory}/#{host_path}"
+    end
+
+    def absolute_path?(path)
+      Pathname.new(path).absolute?
     end
 
     def service_data_directory
@@ -143,7 +149,7 @@ class Mrsk::Configuration::Accessory
       if specifics.key?("host")
         host = specifics["host"]
         if host
-          [host]
+          [ host ]
         else
           raise ArgumentError, "Missing host for accessory `#{name}`"
         end

lib/kamal/configuration/boot.rb

@@ -1,4 +1,4 @@
-class Mrsk::Configuration::Boot
+class Kamal::Configuration::Boot
   def initialize(config:)
     @options = config.raw_config.boot || {}
     @host_count = config.all_hosts.count
@@ -8,7 +8,7 @@ class Mrsk::Configuration::Boot
     limit = @options["limit"]
 
     if limit.to_s.end_with?("%")
-      @host_count * limit.to_i / 100
+      [ @host_count * limit.to_i / 100, 1 ].max
     else
       limit
     end

lib/kamal/configuration/builder.rb

@@ -0,0 +1,122 @@
+class Kamal::Configuration::Builder
+  def initialize(config:)
+    @options = config.raw_config.builder || {}
+    @image = config.image
+    @server = config.registry["server"]
+
+    valid?
+  end
+
+  def to_h
+    @options
+  end
+
+  def multiarch?
+    @options["multiarch"] != false
+  end
+
+  def local?
+    !!@options["local"]
+  end
+
+  def remote?
+    !!@options["remote"]
+  end
+
+  def cached?
+    !!@options["cache"]
+  end
+
+  def args
+    @options["args"] || {}
+  end
+
+  def secrets
+    @options["secrets"] || []
+  end
+
+  def dockerfile
+    @options["dockerfile"] || "Dockerfile"
+  end
+
+  def context
+    @options["context"] || (git_archive? ? "-" : ".")
+  end
+
+  def local_arch
+    @options["local"]["arch"] if local?
+  end
+
+  def local_host
+    @options["local"]["host"] if local?
+  end
+
+  def remote_arch
+    @options["remote"]["arch"] if remote?
+  end
+
+  def remote_host
+    @options["remote"]["host"] if remote?
+  end
+
+  def cache_from
+    if cached?
+      case @options["cache"]["type"]
+      when "gha"
+        cache_from_config_for_gha
+      when "registry"
+        cache_from_config_for_registry
+      end
+    end
+  end
+
+  def cache_to
+    if cached?
+      case @options["cache"]["type"]
+      when "gha"
+        cache_to_config_for_gha
+      when "registry"
+        cache_to_config_for_registry
+      end
+    end
+  end
+
+  def ssh
+    @options["ssh"]
+  end
+
+  def git_archive?
+    Kamal::Git.used? && @options["context"].nil?
+  end
+
+  private
+    def valid?
+      if @options["cache"] && @options["cache"]["type"]
+        raise ArgumentError, "Invalid cache type: #{@options["cache"]["type"]}" unless [ "gha", "registry" ].include?(@options["cache"]["type"])
+      end
+    end
+
+    def cache_image
+      @options["cache"]&.fetch("image", nil) || "#{@image}-build-cache"
+    end
+
+    def cache_image_ref
+      [ @server, cache_image ].compact.join("/")
+    end
+
+    def cache_from_config_for_gha
+      "type=gha"
+    end
+
+    def cache_from_config_for_registry
+      [ "type=registry", "ref=#{cache_image_ref}" ].compact.join(",")
+    end
+
+    def cache_to_config_for_gha
+      [ "type=gha", @options["cache"]&.fetch("options", nil) ].compact.join(",")
+    end
+
+    def cache_to_config_for_registry
+      [ "type=registry", @options["cache"]&.fetch("options", nil), "ref=#{cache_image_ref}" ].compact.join(",")
+    end
+end

lib/kamal/configuration/env.rb

@@ -0,0 +1,40 @@
+class Kamal::Configuration::Env
+  attr_reader :secrets_keys, :clear, :secrets_file
+  delegate :argumentize, to: Kamal::Utils
+
+  def self.from_config(config:, secrets_file: nil)
+    secrets_keys = config.fetch("secret", [])
+    clear = config.fetch("clear", config.key?("secret") ? {} : config)
+
+    new clear: clear, secrets_keys: secrets_keys, secrets_file: secrets_file
+  end
+
+  def initialize(clear:, secrets_keys:, secrets_file:)
+    @clear = clear
+    @secrets_keys = secrets_keys
+    @secrets_file = secrets_file
+  end
+
+  def args
+    [ "--env-file", secrets_file, *argumentize("--env", clear) ]
+  end
+
+  def secrets_io
+    StringIO.new(Kamal::EnvFile.new(secrets).to_s)
+  end
+
+  def secrets
+    @secrets ||= secrets_keys.to_h { |key| [ key, ENV.fetch(key) ] }
+  end
+
+  def secrets_directory
+    File.dirname(secrets_file)
+  end
+
+  def merge(other)
+    self.class.new \
+      clear: @clear.merge(other.clear),
+      secrets_keys: @secrets_keys | other.secrets_keys,
+      secrets_file: secrets_file
+  end
+end

lib/kamal/configuration/role.rb

@@ -0,0 +1,184 @@
+class Kamal::Configuration::Role
+  delegate :argumentize, :optionize, to: Kamal::Utils
+
+  attr_accessor :name
+  alias to_s name
+
+  def initialize(name, config:)
+    @name, @config = name.inquiry, config
+  end
+
+  def primary_host
+    hosts.first
+  end
+
+  def hosts
+    @hosts ||= extract_hosts_from_config
+  end
+
+  def port
+    specializations["port"] || config.port || "3000"
+  end
+
+  def cmd
+    specializations["cmd"]
+  end
+
+  def option_args
+    if args = specializations["options"]
+      optionize args
+    else
+      []
+    end
+  end
+
+  def labels
+    default_labels.merge(custom_labels)
+  end
+
+  def label_args
+    argumentize "--label", labels
+  end
+
+  def logging_args
+    args = config.logging || {}
+    args.deep_merge!(specializations["logging"]) if specializations["logging"].present?
+
+    if args.any?
+      optionize({ "log-driver" => args["driver"] }.compact) +
+        argumentize("--log-opt", args["options"])
+    else
+      config.logging_args
+    end
+  end
+
+
+  def env
+    @env ||= base_env.merge(specialized_env)
+  end
+
+  def env_args
+    env.args
+  end
+
+  def asset_volume_args
+    asset_volume&.docker_args
+  end
+
+
+  def health_check_args
+    if health_check_cmd.present?
+      optionize({ "health-cmd" => health_check_cmd, "health-interval" => health_check_interval })
+    else
+      []
+    end
+  end
+
+  def health_check_cmd
+    health_check_options["cmd"] || http_health_check(port: health_check_options["port"], path: health_check_options["path"])
+  end
+
+  def health_check_interval
+    health_check_options["interval"] || "1s"
+  end
+
+
+  def running_proxy?
+    if specializations["proxy"].nil?
+      primary?
+    else
+      specializations["proxy"]
+    end
+  end
+
+  def primary?
+    self == @config.primary_role
+  end
+
+
+  def container_name(version = nil)
+    [ container_prefix, version || config.version ].compact.join("-")
+  end
+
+  def container_prefix
+    [ config.service, name, config.destination ].compact.join("-")
+  end
+
+
+  def asset_path
+    specializations["asset_path"] || config.asset_path
+  end
+
+  def assets?
+    asset_path.present? && running_proxy?
+  end
+
+  def asset_volume(version = nil)
+    if assets?
+      Kamal::Configuration::Volume.new \
+        host_path: asset_volume_path(version), container_path: asset_path
+    end
+  end
+
+  def asset_extracted_path(version = nil)
+    File.join config.run_directory, "assets", "extracted", container_name(version)
+  end
+
+  def asset_volume_path(version = nil)
+    File.join config.run_directory, "assets", "volumes", container_name(version)
+  end
+
+  private
+    attr_accessor :config
+
+    def extract_hosts_from_config
+      if config.servers.is_a?(Array)
+        config.servers
+      else
+        servers = config.servers[name]
+        servers.is_a?(Array) ? servers : Array(servers["hosts"])
+      end
+    end
+
+    def default_labels
+      { "service" => config.service, "role" => name, "destination" => config.destination }
+    end
+
+    def custom_labels
+      Hash.new.tap do |labels|
+        labels.merge!(config.labels) if config.labels.present?
+        labels.merge!(specializations["labels"]) if specializations["labels"].present?
+      end
+    end
+
+    def specializations
+      if config.servers.is_a?(Array) || config.servers[name].is_a?(Array)
+        {}
+      else
+        config.servers[name].except("hosts")
+      end
+    end
+
+    def specialized_env
+      Kamal::Configuration::Env.from_config config: specializations.fetch("env", {})
+    end
+
+    # Secrets are stored in an array, which won't merge by default, so have to do it by hand.
+    def base_env
+      Kamal::Configuration::Env.from_config \
+        config: config.env,
+        secrets_file: File.join(config.host_env_directory, "roles", "#{container_prefix}.env")
+    end
+
+    def http_health_check(port:, path:)
+      "curl -f #{URI.join("http://localhost:#{port}", path)} || exit 1" if path.present? || port.present?
+    end
+
+    def health_check_options
+      @health_check_options ||= begin
+        options = specializations["healthcheck"] || {}
+        options = config.healthcheck.merge(options) if running_proxy?
+        options
+      end
+    end
+end

lib/kamal/configuration/ssh.rb

@@ -0,0 +1,42 @@
+class Kamal::Configuration::Ssh
+  LOGGER = ::Logger.new(STDERR)
+
+  def initialize(config:)
+    @config = config.raw_config.ssh || {}
+  end
+
+  def user
+    config.fetch("user", "root")
+  end
+
+  def port
+    config.fetch("port", 22)
+  end
+
+  def proxy
+    if (proxy = config["proxy"])
+      Net::SSH::Proxy::Jump.new(proxy.include?("@") ? proxy : "root@#{proxy}")
+    elsif (proxy_command = config["proxy_command"])
+      Net::SSH::Proxy::Command.new(proxy_command)
+    end
+  end
+
+  def options
+    { user: user, port: port, proxy: proxy, logger: logger, keepalive: true, keepalive_interval: 30 }.compact
+  end
+
+  def to_h
+    options.except(:logger).merge(log_level: log_level)
+  end
+
+  private
+    attr_accessor :config
+
+    def logger
+      LOGGER.tap { |logger| logger.level = log_level }
+    end
+
+    def log_level
+      config.fetch("log_level", :fatal)
+    end
+end

lib/kamal/configuration/sshkit.rb

@@ -0,0 +1,20 @@
+class Kamal::Configuration::Sshkit
+  def initialize(config:)
+    @options = config.raw_config.sshkit || {}
+  end
+
+  def max_concurrent_starts
+    options.fetch("max_concurrent_starts", 30)
+  end
+
+  def pool_idle_timeout
+    options.fetch("pool_idle_timeout", 900)
+  end
+
+  def to_h
+    options
+  end
+
+  private
+    attr_accessor :options
+end

lib/kamal/configuration/volume.rb

@@ -0,0 +1,22 @@
+class Kamal::Configuration::Volume
+  attr_reader :host_path, :container_path
+  delegate :argumentize, to: Kamal::Utils
+
+  def initialize(host_path:, container_path:)
+    @host_path = host_path
+    @container_path = container_path
+  end
+
+  def docker_args
+    argumentize "--volume", "#{host_path_for_docker_volume}:#{container_path}"
+  end
+
+  private
+    def host_path_for_docker_volume
+      if Pathname.new(host_path).absolute?
+        host_path
+      else
+        File.join "$(pwd)", host_path
+      end
+    end
+end

lib/kamal/env_file.rb

@@ -0,0 +1,31 @@
+# Encode an env hash as a string where secret values have been looked up and all values escaped for Docker.
+class Kamal::EnvFile
+  def initialize(env)
+    @env = env
+  end
+
+  def to_s
+    env_file = StringIO.new.tap do |contents|
+      @env.each do |key, value|
+        contents << docker_env_file_line(key, value)
+      end
+    end.string
+
+    # Ensure the file has some contents to avoid the SSHKIT empty file warning
+    env_file.presence || "\n"
+  end
+
+  alias to_str to_s
+
+  private
+    def docker_env_file_line(key, value)
+      "#{key}=#{escape_docker_env_file_value(value)}\n"
+    end
+
+    # Escape a value to make it safe to dump in a docker file.
+    def escape_docker_env_file_value(value)
+      # Doublequotes are treated literally in docker env files
+      # so remove leading and trailing ones and unescape any others
+      value.to_s.dump[1..-2].gsub(/\\"/, "\"")
+    end
+end

lib/kamal/git.rb

@@ -0,0 +1,19 @@
+module Kamal::Git
+  extend self
+
+  def used?
+    system("git rev-parse")
+  end
+
+  def user_name
+    `git config user.name`.strip
+  end
+
+  def revision
+    `git rev-parse HEAD`.strip
+  end
+
+  def uncommitted_changes
+    `git status --porcelain`.strip
+  end
+end

lib/kamal/sshkit_with_ext.rb

@@ -1,5 +1,6 @@
 require "sshkit"
 require "sshkit/dsl"
+require "net/scp"
 require "active_support/core_ext/hash/deep_merge"
 require "json"
 
@@ -54,3 +55,51 @@ class SSHKit::Backend::Abstract
   end
   prepend CommandEnvMerge
 end
+
+class SSHKit::Backend::Netssh::Configuration
+  attr_accessor :max_concurrent_starts
+end
+
+class SSHKit::Backend::Netssh
+  module LimitConcurrentStartsClass
+    attr_reader :start_semaphore
+
+    def configure(&block)
+      super &block
+      # Create this here to avoid lazy creation by multiple threads
+      if config.max_concurrent_starts
+        @start_semaphore = Concurrent::Semaphore.new(config.max_concurrent_starts)
+      end
+    end
+  end
+
+  class << self
+    prepend LimitConcurrentStartsClass
+  end
+
+  module LimitConcurrentStartsInstance
+    private
+      def with_ssh(&block)
+        host.ssh_options = self.class.config.ssh_options.merge(host.ssh_options || {})
+        self.class.pool.with(
+          method(:start_with_concurrency_limit),
+          String(host.hostname),
+          host.username,
+          host.netssh_options,
+          &block
+        )
+      end
+
+      def start_with_concurrency_limit(*args)
+        if self.class.start_semaphore
+          self.class.start_semaphore.acquire do
+            Net::SSH.start(*args)
+          end
+        else
+          Net::SSH.start(*args)
+        end
+      end
+  end
+
+  prepend LimitConcurrentStartsInstance
+end

lib/kamal/tags.rb

@@ -1,6 +1,6 @@
 require "time"
 
-class Mrsk::Tags
+class Kamal::Tags
   attr_reader :config, :tags
 
   class << self
@@ -26,7 +26,7 @@ class Mrsk::Tags
   end
 
   def env
-    tags.transform_keys { |detail| "MRSK_#{detail.upcase}" }
+    tags.transform_keys { |detail| "KAMAL_#{detail.upcase}" }
   end
 
   def to_s

lib/kamal/utils.rb

@@ -1,4 +1,4 @@
-module Mrsk::Utils
+module Kamal::Utils
   extend self
 
   DOLLAR_SIGN_WITHOUT_SHELL_EXPANSION_REGEX = /\$(?!{[^\}]*\})/
@@ -9,23 +9,13 @@ module Mrsk::Utils
       if value.present?
         attr = "#{key}=#{escape_shell_value(value)}"
         attr = self.sensitive(attr, redaction: "#{key}=[REDACTED]") if sensitive
-        [ argument, attr]
+        [ argument, attr ]
       else
         [ argument, key ]
       end
     end
   end
 
-  # Return a list of shell arguments using the same named argument against the passed attributes,
-  # but redacts and expands secrets.
-  def argumentize_env_with_secrets(env)
-    if (secrets = env["secret"]).present?
-      argumentize("-e", secrets.to_h { |key| [ key, ENV.fetch(key) ] }, sensitive: true) + argumentize("-e", env["clear"])
-    else
-      argumentize "-e", env.fetch("clear", env)
-    end
-  end
-
   # Returns a list of shell-dashed option arguments. If the value is true, it's treated like a value-less option.
   def optionize(args, with: nil)
     options = if with
@@ -39,14 +29,14 @@ module Mrsk::Utils
 
   # Flattens a one-to-many structure into an array of two-element arrays each containing a key-value pair
   def flatten_args(args)
-    args.flat_map { |key, value| value.try(:map) { |entry| [key, entry] } || [ [ key, value ] ] }
+    args.flat_map { |key, value| value.try(:map) { |entry| [ key, entry ] } || [ [ key, value ] ] }
   end
 
   # Marks sensitive values for redaction in logs and human-visible output.
   # Pass `redaction:` to change the default `"[REDACTED]"` redaction, e.g.
   # `sensitive "#{arg}=#{secret}", redaction: "#{arg}=xxxx"
   def sensitive(...)
-    Mrsk::Utils::Sensitive.new(...)
+    Kamal::Utils::Sensitive.new(...)
   end
 
   def redacted(value)
@@ -62,19 +52,6 @@ module Mrsk::Utils
     end
   end
 
-  def unredacted(value)
-    case
-    when value.respond_to?(:unredacted)
-      value.unredacted
-    when value.respond_to?(:transform_values)
-      value.transform_values { |value| unredacted value }
-    when value.respond_to?(:map)
-      value.map { |element| unredacted element }
-    else
-      value
-    end
-  end
-
   # Escape a value to make it safe for shell use.
   def escape_shell_value(value)
     value.to_s.dump
@@ -82,15 +59,19 @@ module Mrsk::Utils
       .gsub(DOLLAR_SIGN_WITHOUT_SHELL_EXPANSION_REGEX, '\$')
   end
 
-  # Abbreviate a git revhash for concise display
+  # Apply a list of host or role filters, including wildcard matches
-  def abbreviate_version(version)
+  def filter_specific_items(filters, items)
-    if version
+    matches = []
-      # Don't abbreviate <sha>_uncommitted_<etc>
+
-      if version.include?("_")
+    Array(filters).select do |filter|
-        version
+      matches += Array(items).select do |item|
-      else
+        # Only allow * for a wildcard
-        version[0...7]
+        pattern = Regexp.escape(filter).gsub('\*', ".*")
+        # items are roles or hosts
+        (item.respond_to?(:name) ? item.name : item).match(/^#{pattern}$/)
       end
     end
+
+    matches
   end
 end

lib/kamal/utils/sensitive.rb

@@ -1,6 +1,7 @@
 require "active_support/core_ext/module/delegation"
+require "sshkit"
 
-class Mrsk::Utils::Sensitive
+class Kamal::Utils::Sensitive
   # So SSHKit knows to redact these values.
   include SSHKit::Redaction
 

lib/kamal/version.rb

@@ -0,0 +1,3 @@
+module Kamal
+  VERSION = "1.4.0"
+end

lib/mrsk/cli/app.rb

@@ -1,290 +0,0 @@
-class Mrsk::Cli::App < Mrsk::Cli::Base
-  desc "boot", "Boot app on servers (or reboot app if already running)"
-  def boot
-    with_lock do
-      hold_lock_on_error do
-        say "Get most recent version available as an image...", :magenta unless options[:version]
-        using_version(version_or_latest) do |version|
-          say "Start container with version #{version} using a #{MRSK.config.readiness_delay}s readiness delay (or reboot if already running)...", :magenta
-
-          on(MRSK.hosts) do
-            execute *MRSK.auditor.record("Tagging #{MRSK.config.absolute_image} as the latest image"), verbosity: :debug
-            execute *MRSK.app.tag_current_as_latest
-          end
-
-          on(MRSK.hosts, **MRSK.boot_strategy) do |host|
-            roles = MRSK.roles_on(host)
-
-            roles.each do |role|
-              app = MRSK.app(role: role)
-              auditor = MRSK.auditor(role: role)
-
-              if capture_with_info(*app.container_id_for_version(version, only_running: true), raise_on_non_zero_exit: false).present?
-                tmp_version = "#{version}_replaced_#{SecureRandom.hex(8)}"
-                info "Renaming container #{version} to #{tmp_version} as already deployed on #{host}"
-                execute *auditor.record("Renaming container #{version} to #{tmp_version}"), verbosity: :debug
-                execute *app.rename_container(version: version, new_version: tmp_version)
-              end
-
-              execute *auditor.record("Booted app version #{version}"), verbosity: :debug
-
-              old_version = capture_with_info(*app.current_running_version, raise_on_non_zero_exit: false).strip
-              execute *app.start_or_run
-
-              Mrsk::Utils::HealthcheckPoller.wait_for_healthy(pause_after_ready: true) { capture_with_info(*app.status(version: version)) }
-
-              execute *app.stop(version: old_version), raise_on_non_zero_exit: false if old_version.present?
-            end
-          end
-        end
-      end
-    end
-  end
-
-  desc "start", "Start existing app container on servers"
-  def start
-    with_lock do
-      on(MRSK.hosts) do |host|
-        roles = MRSK.roles_on(host)
-
-        roles.each do |role|
-          execute *MRSK.auditor.record("Started app version #{MRSK.config.version}"), verbosity: :debug
-          execute *MRSK.app(role: role).start, raise_on_non_zero_exit: false
-        end
-      end
-    end
-  end
-
-  desc "stop", "Stop app container on servers"
-  def stop
-    with_lock do
-      on(MRSK.hosts) do |host|
-        roles = MRSK.roles_on(host)
-
-        roles.each do |role|
-          execute *MRSK.auditor.record("Stopped app", role: role), verbosity: :debug
-          execute *MRSK.app(role: role).stop, raise_on_non_zero_exit: false
-        end
-      end
-    end
-  end
-
-  # FIXME: Drop in favor of just containers?
-  desc "details", "Show details about app containers"
-  def details
-    on(MRSK.hosts) do |host|
-      roles = MRSK.roles_on(host)
-
-      roles.each do |role|
-        puts_by_host host, capture_with_info(*MRSK.app(role: role).info)
-      end
-    end
-  end
-
-  desc "exec [CMD]", "Execute a custom command on servers (use --help to show options)"
-  option :interactive, aliases: "-i", type: :boolean, default: false, desc: "Execute command over ssh for an interactive shell (use for console/bash)"
-  option :reuse, type: :boolean, default: false, desc: "Reuse currently running container instead of starting a new one"
-  def exec(cmd)
-    case
-    when options[:interactive] && options[:reuse]
-      say "Get current version of running container...", :magenta unless options[:version]
-      using_version(options[:version] || current_running_version) do |version|
-        say "Launching interactive command with version #{version} via SSH from existing container on #{MRSK.primary_host}...", :magenta
-        run_locally { exec MRSK.app(role: "web").execute_in_existing_container_over_ssh(cmd, host: MRSK.primary_host) }
-      end
-
-    when options[:interactive]
-      say "Get most recent version available as an image...", :magenta unless options[:version]
-      using_version(version_or_latest) do |version|
-        say "Launching interactive command with version #{version} via SSH from new container on #{MRSK.primary_host}...", :magenta
-        run_locally { exec MRSK.app.execute_in_new_container_over_ssh(cmd, host: MRSK.primary_host) }
-      end
-
-    when options[:reuse]
-      say "Get current version of running container...", :magenta unless options[:version]
-      using_version(options[:version] || current_running_version) do |version|
-        say "Launching command with version #{version} from existing container...", :magenta
-
-        on(MRSK.hosts) do |host|
-          roles = MRSK.roles_on(host)
-
-          roles.each do |role|
-            execute *MRSK.auditor.record("Executed cmd '#{cmd}' on app version #{version}", role: role), verbosity: :debug
-            puts_by_host host, capture_with_info(*MRSK.app(role: role).execute_in_existing_container(cmd))
-          end
-        end
-      end
-
-    else
-      say "Get most recent version available as an image...", :magenta unless options[:version]
-      using_version(version_or_latest) do |version|
-        say "Launching command with version #{version} from new container...", :magenta
-        on(MRSK.hosts) do |host|
-          execute *MRSK.auditor.record("Executed cmd '#{cmd}' on app version #{version}"), verbosity: :debug
-          puts_by_host host, capture_with_info(*MRSK.app.execute_in_new_container(cmd))
-        end
-      end
-    end
-  end
-
-  desc "containers", "Show app containers on servers"
-  def containers
-    on(MRSK.hosts) { |host| puts_by_host host, capture_with_info(*MRSK.app.list_containers) }
-  end
-
-  desc "stale_containers", "Detect app stale containers"
-  option :stop, aliases: "-s", type: :boolean, default: false, desc: "Stop the stale containers found"
-  def stale_containers
-    with_lock do
-      stop = options[:stop]
-
-      cli = self
-
-      on(MRSK.hosts) do |host|
-        roles = MRSK.roles_on(host)
-
-        roles.each do |role|
-          cli.send(:stale_versions, host: host, role: role).each do |version|
-            if stop
-              puts_by_host host, "Stopping stale container for role #{role} with version #{version}"
-              execute *MRSK.app(role: role).stop(version: version), raise_on_non_zero_exit: false
-            else
-              puts_by_host host,  "Detected stale container for role #{role} with version #{version} (use `mrsk app stale_containers --stop` to stop)"
-            end
-          end
-        end
-      end
-    end
-  end
-
-  desc "images", "Show app images on servers"
-  def images
-    on(MRSK.hosts) { |host| puts_by_host host, capture_with_info(*MRSK.app.list_images) }
-  end
-
-  desc "logs", "Show log lines from app on servers (use --help to show options)"
-  option :since, aliases: "-s", desc: "Show lines since timestamp (e.g. 2013-01-02T13:23:37Z) or relative (e.g. 42m for 42 minutes)"
-  option :lines, type: :numeric, aliases: "-n", desc: "Number of lines to show from each server"
-  option :grep, aliases: "-g", desc: "Show lines with grep match only (use this to fetch specific requests by id)"
-  option :follow, aliases: "-f", desc: "Follow log on primary server (or specific host set by --hosts)"
-  def logs
-    # FIXME: Catch when app containers aren't running
-
-    grep = options[:grep]
-
-    if options[:follow]
-      run_locally do
-        info "Following logs on #{MRSK.primary_host}..."
-
-        MRSK.specific_roles ||= ["web"]
-        role = MRSK.roles_on(MRSK.primary_host).first
-
-        info MRSK.app(role: role).follow_logs(host: MRSK.primary_host, grep: grep)
-        exec MRSK.app(role: role).follow_logs(host: MRSK.primary_host, grep: grep)
-      end
-    else
-      since = options[:since]
-      lines = options[:lines].presence || ((since || grep) ? nil : 100) # Default to 100 lines if since or grep isn't set
-
-      on(MRSK.hosts) do |host|
-        roles = MRSK.roles_on(host)
-
-        roles.each do |role|
-          begin
-            puts_by_host host, capture_with_info(*MRSK.app(role: role).logs(since: since, lines: lines, grep: grep))
-          rescue SSHKit::Command::Failed
-            puts_by_host host, "Nothing found"
-          end
-        end
-      end
-    end
-  end
-
-  desc "remove", "Remove app containers and images from servers"
-  def remove
-    with_lock do
-      stop
-      remove_containers
-      remove_images
-    end
-  end
-
-  desc "remove_container [VERSION]", "Remove app container with given version from servers", hide: true
-  def remove_container(version)
-    with_lock do
-      on(MRSK.hosts) do |host|
-        roles = MRSK.roles_on(host)
-
-        roles.each do |role|
-          execute *MRSK.auditor.record("Removed app container with version #{version}", role: role), verbosity: :debug
-          execute *MRSK.app(role: role).remove_container(version: version)
-        end
-      end
-    end
-  end
-
-  desc "remove_containers", "Remove all app containers from servers", hide: true
-  def remove_containers
-    with_lock do
-      on(MRSK.hosts) do |host|
-        roles = MRSK.roles_on(host)
-
-        roles.each do |role|
-          execute *MRSK.auditor.record("Removed all app containers", role: role), verbosity: :debug
-          execute *MRSK.app(role: role).remove_containers
-        end
-      end
-    end
-  end
-
-  desc "remove_images", "Remove all app images from servers", hide: true
-  def remove_images
-    with_lock do
-      on(MRSK.hosts) do
-        execute *MRSK.auditor.record("Removed all app images"), verbosity: :debug
-        execute *MRSK.app.remove_images
-      end
-    end
-  end
-
-  desc "version", "Show app version currently running on servers"
-  def version
-    on(MRSK.hosts) { |host| puts_by_host host, capture_with_info(*MRSK.app.current_running_version).strip }
-  end
-
-  private
-    def using_version(new_version)
-      if new_version
-        begin
-          old_version = MRSK.config.version
-          MRSK.config.version = new_version
-          yield new_version
-        ensure
-          MRSK.config.version = old_version
-        end
-      else
-        yield MRSK.config.version
-      end
-    end
-
-    def current_running_version(host: MRSK.primary_host)
-      version = nil
-      on(host) { version = capture_with_info(*MRSK.app.current_running_version).strip }
-      version.presence
-    end
-
-    def stale_versions(host:, role:)
-      versions = nil
-      on(host) do
-        versions = \
-          capture_with_info(*MRSK.app(role: role).list_versions, raise_on_non_zero_exit: false)
-          .split("\n")
-          .drop(1)
-      end
-      versions
-    end
-
-    def version_or_latest
-      options[:version] || "latest"
-    end
-end

lib/mrsk/cli/healthcheck.rb

@@ -1,20 +0,0 @@
-class Mrsk::Cli::Healthcheck < Mrsk::Cli::Base
-  default_command :perform
-
-  desc "perform", "Health check current app version"
-  def perform
-    on(MRSK.primary_host) do
-      begin
-        execute *MRSK.healthcheck.run
-        Mrsk::Utils::HealthcheckPoller.wait_for_healthy { capture_with_info(*MRSK.healthcheck.status) }
-      rescue Mrsk::Utils::HealthcheckPoller::HealthcheckError => e
-        error capture_with_info(*MRSK.healthcheck.logs)
-        error capture_with_pretty_json(*MRSK.healthcheck.container_health_log)
-        raise
-      ensure
-        execute *MRSK.healthcheck.stop, raise_on_non_zero_exit: false
-        execute *MRSK.healthcheck.remove, raise_on_non_zero_exit: false
-      end
-    end
-  end
-end

lib/mrsk/cli/main.rb

@@ -1,243 +0,0 @@
-class Mrsk::Cli::Main < Mrsk::Cli::Base
-  desc "setup", "Setup all accessories and deploy app to servers"
-  def setup
-    print_runtime do
-      with_lock do
-        invoke "mrsk:cli:server:bootstrap"
-        invoke "mrsk:cli:accessory:boot", [ "all" ]
-        deploy
-      end
-    end
-  end
-
-  desc "deploy", "Deploy app to servers"
-  option :skip_push, aliases: "-P", type: :boolean, default: false, desc: "Skip image build and push"
-  def deploy
-    runtime = print_runtime do
-      with_lock do
-        invoke_options = deploy_options
-
-        say "Log into image registry...", :magenta
-        invoke "mrsk:cli:registry:login", [], invoke_options
-
-        if options[:skip_push]
-          say "Pull app image...", :magenta
-          invoke "mrsk:cli:build:pull", [], invoke_options
-        else
-          say "Build and push app image...", :magenta
-          invoke "mrsk:cli:build:deliver", [], invoke_options
-        end
-
-        say "Ensure Traefik is running...", :magenta
-        invoke "mrsk:cli:traefik:boot", [], invoke_options
-
-        say "Ensure app can pass healthcheck...", :magenta
-        invoke "mrsk:cli:healthcheck:perform", [], invoke_options
-
-        say "Detect stale containers...", :magenta
-        invoke "mrsk:cli:app:stale_containers", [], invoke_options
-
-        invoke "mrsk:cli:app:boot", [], invoke_options
-
-        say "Prune old containers and images...", :magenta
-        invoke "mrsk:cli:prune:all", [], invoke_options
-      end
-    end
-
-    run_hook "post-deploy", runtime: runtime.round
-  end
-
-  desc "redeploy", "Deploy app to servers without bootstrapping servers, starting Traefik, pruning, and registry login"
-  option :skip_push, aliases: "-P", type: :boolean, default: false, desc: "Skip image build and push"
-  def redeploy
-    runtime = print_runtime do
-      with_lock do
-        invoke_options = deploy_options
-
-        if options[:skip_push]
-          say "Pull app image...", :magenta
-          invoke "mrsk:cli:build:pull", [], invoke_options
-        else
-          say "Build and push app image...", :magenta
-          invoke "mrsk:cli:build:deliver", [], invoke_options
-        end
-
-        say "Ensure app can pass healthcheck...", :magenta
-        invoke "mrsk:cli:healthcheck:perform", [], invoke_options
-
-        say "Detect stale containers...", :magenta
-        invoke "mrsk:cli:app:stale_containers", [], invoke_options
-
-        invoke "mrsk:cli:app:boot", [], invoke_options
-      end
-    end
-
-    run_hook "post-deploy", runtime: runtime.round
-  end
-
-  desc "rollback [VERSION]", "Rollback app to VERSION"
-  def rollback(version)
-    rolled_back = false
-    runtime = print_runtime do
-      with_lock do
-        invoke_options = deploy_options
-
-        MRSK.config.version = version
-        old_version = nil
-
-        if container_available?(version)
-          invoke "mrsk:cli:app:boot", [], invoke_options.merge(version: version)
-          rolled_back = true
-        else
-          say "The app version '#{version}' is not available as a container (use 'mrsk app containers' for available versions)", :red
-        end
-      end
-    end
-
-    run_hook "post-deploy", runtime: runtime.round if rolled_back
-  end
-
-  desc "details", "Show details about all containers"
-  def details
-    invoke "mrsk:cli:traefik:details"
-    invoke "mrsk:cli:app:details"
-    invoke "mrsk:cli:accessory:details", [ "all" ]
-  end
-
-  desc "audit", "Show audit log from servers"
-  def audit
-    on(MRSK.hosts) do |host|
-      puts_by_host host, capture_with_info(*MRSK.auditor.reveal)
-    end
-  end
-
-  desc "config", "Show combined config (including secrets!)"
-  def config
-    run_locally do
-      puts Mrsk::Utils.redacted(MRSK.config.to_h).to_yaml
-    end
-  end
-
-  desc "init", "Create config stub in config/deploy.yml and env stub in .env"
-  option :bundle, type: :boolean, default: false, desc: "Add MRSK to the Gemfile and create a bin/mrsk binstub"
-  def init
-    require "fileutils"
-
-    if (deploy_file = Pathname.new(File.expand_path("config/deploy.yml"))).exist?
-      puts "Config file already exists in config/deploy.yml (remove first to create a new one)"
-    else
-      FileUtils.mkdir_p deploy_file.dirname
-      FileUtils.cp_r Pathname.new(File.expand_path("templates/deploy.yml", __dir__)), deploy_file
-      puts "Created configuration file in config/deploy.yml"
-    end
-
-    unless (deploy_file = Pathname.new(File.expand_path(".env"))).exist?
-      FileUtils.cp_r Pathname.new(File.expand_path("templates/template.env", __dir__)), deploy_file
-      puts "Created .env file"
-    end
-
-    unless (hooks_dir = Pathname.new(File.expand_path(".mrsk/hooks"))).exist?
-      hooks_dir.mkpath
-      Pathname.new(File.expand_path("templates/sample_hooks", __dir__)).each_child do |sample_hook|
-        FileUtils.cp sample_hook, hooks_dir, preserve: true
-      end
-      puts "Created sample hooks in .mrsk/hooks"
-    end
-
-    if options[:bundle]
-      if (binstub = Pathname.new(File.expand_path("bin/mrsk"))).exist?
-        puts "Binstub already exists in bin/mrsk (remove first to create a new one)"
-      else
-        puts "Adding MRSK to Gemfile and bundle..."
-        run_locally do
-          execute :bundle, :add, :mrsk
-          execute :bundle, :binstubs, :mrsk
-        end
-        puts "Created binstub file in bin/mrsk"
-      end
-    end
-  end
-
-  desc "envify", "Create .env by evaluating .env.erb (or .env.staging.erb -> .env.staging when using -d staging)"
-  def envify
-    if destination = options[:destination]
-      env_template_path = ".env.#{destination}.erb"
-      env_path          = ".env.#{destination}"
-    else
-      env_template_path = ".env.erb"
-      env_path          = ".env"
-    end
-
-    File.write(env_path, ERB.new(File.read(env_template_path)).result, perm: 0600)
-  end
-
-  desc "remove", "Remove Traefik, app, accessories, and registry session from servers"
-  option :confirmed, aliases: "-y", type: :boolean, default: false, desc: "Proceed without confirmation question"
-  def remove
-    with_lock do
-      if options[:confirmed] || ask("This will remove all containers and images. Are you sure?", limited_to: %w( y N ), default: "N") == "y"
-        invoke "mrsk:cli:traefik:remove", [], options.without(:confirmed)
-        invoke "mrsk:cli:app:remove", [], options.without(:confirmed)
-        invoke "mrsk:cli:accessory:remove", [ "all" ], options
-        invoke "mrsk:cli:registry:logout", [], options.without(:confirmed)
-      end
-    end
-  end
-
-  desc "version", "Show MRSK version"
-  def version
-    puts Mrsk::VERSION
-  end
-
-  desc "accessory", "Manage accessories (db/redis/search)"
-  subcommand "accessory", Mrsk::Cli::Accessory
-
-  desc "app", "Manage application"
-  subcommand "app", Mrsk::Cli::App
-
-  desc "build", "Build application image"
-  subcommand "build", Mrsk::Cli::Build
-
-  desc "healthcheck", "Healthcheck application"
-  subcommand "healthcheck", Mrsk::Cli::Healthcheck
-
-  desc "lock", "Manage the deploy lock"
-  subcommand "lock", Mrsk::Cli::Lock
-
-  desc "prune", "Prune old application images and containers"
-  subcommand "prune", Mrsk::Cli::Prune
-
-  desc "registry", "Login and -out of the image registry"
-  subcommand "registry", Mrsk::Cli::Registry
-
-  desc "server", "Bootstrap servers with curl and Docker"
-  subcommand "server", Mrsk::Cli::Server
-
-  desc "traefik", "Manage Traefik load balancer"
-  subcommand "traefik", Mrsk::Cli::Traefik
-
-  private
-    def container_available?(version)
-      begin
-        on(MRSK.hosts) do
-          MRSK.roles_on(host).each do |role|
-            container_id = capture_with_info(*MRSK.app(role: role).container_id_for_version(version))
-            raise "Container not found" unless container_id.present?
-          end
-        end
-      rescue SSHKit::Runner::ExecuteError => e
-        if e.message =~ /Container not found/
-          say "Error looking for container version #{version}: #{e.message}"
-          return false
-        else
-          raise
-        end
-      end
-
-      true
-    end
-
-    def deploy_options
-      { "version" => MRSK.config.version }.merge(options.without("skip_push"))
-    end
-end

lib/mrsk/cli/prune.rb

@@ -1,29 +0,0 @@
-class Mrsk::Cli::Prune < Mrsk::Cli::Base
-  desc "all", "Prune unused images and stopped containers"
-  def all
-    with_lock do
-      containers
-      images
-    end
-  end
-
-  desc "images", "Prune dangling images"
-  def images
-    with_lock do
-      on(MRSK.hosts) do
-        execute *MRSK.auditor.record("Pruned images"), verbosity: :debug
-        execute *MRSK.prune.images
-      end
-    end
-  end
-
-  desc "containers", "Prune all stopped containers, except the last 5"
-  def containers
-    with_lock do
-      on(MRSK.hosts) do
-        execute *MRSK.auditor.record("Pruned containers"), verbosity: :debug
-        execute *MRSK.prune.containers
-      end
-    end
-  end
-end

lib/mrsk/cli/server.rb

@@ -1,21 +0,0 @@
-class Mrsk::Cli::Server < Mrsk::Cli::Base
-  desc "bootstrap", "Set up Docker to run MRSK apps"
-  def bootstrap
-    missing = []
-
-    on(MRSK.hosts | MRSK.accessory_hosts) do |host|
-      unless execute(*MRSK.docker.installed?, raise_on_non_zero_exit: false)
-        if execute(*MRSK.docker.superuser?, raise_on_non_zero_exit: false)
-          info "Missing Docker on #{host}. Installing…"
-          execute *MRSK.docker.install
-        else
-          missing << host
-        end
-      end
-    end
-
-    if missing.any?
-      raise "Docker is not installed on #{missing.join(", ")} and can't be automatically installed without having root access and the `curl` command available. Install Docker manually: https://docs.docker.com/engine/install/"
-    end
-  end
-end

lib/mrsk/cli/templates/sample_hooks/post-deploy.sample

@@ -1,14 +0,0 @@
-#!/bin/sh
-
-# A sample post-deploy hook
-#
-# These environment variables are available:
-# MRSK_RECORDED_AT
-# MRSK_PERFORMER
-# MRSK_VERSION
-# MRSK_HOSTS
-# MRSK_ROLE (if set)
-# MRSK_DESTINATION (if set)
-# MRSK_RUNTIME
-
-echo "$MRSK_PERFORMER deployed $MRSK_VERSION to $MRSK_DESTINATION in $MRSK_RUNTIME seconds"

lib/mrsk/cli/templates/template.env

@@ -1,2 +0,0 @@
-MRSK_REGISTRY_PASSWORD=change-this
-RAILS_MASTER_KEY=another-env

lib/mrsk/cli/traefik.rb

@@ -1,106 +0,0 @@
-class Mrsk::Cli::Traefik < Mrsk::Cli::Base
-  desc "boot", "Boot Traefik on servers"
-  def boot
-    with_lock do
-      on(MRSK.traefik_hosts) do
-        execute *MRSK.registry.login
-        execute *MRSK.traefik.run, raise_on_non_zero_exit: false
-      end
-    end
-  end
-
-  desc "reboot", "Reboot Traefik on servers (stop container, remove container, start new container)"
-  def reboot
-    with_lock do
-      stop
-      remove_container
-      boot
-    end
-  end
-
-  desc "start", "Start existing Traefik container on servers"
-  def start
-    with_lock do
-      on(MRSK.traefik_hosts) do
-        execute *MRSK.auditor.record("Started traefik"), verbosity: :debug
-        execute *MRSK.traefik.start, raise_on_non_zero_exit: false
-      end
-    end
-  end
-
-  desc "stop", "Stop existing Traefik container on servers"
-  def stop
-    with_lock do
-      on(MRSK.traefik_hosts) do
-        execute *MRSK.auditor.record("Stopped traefik"), verbosity: :debug
-        execute *MRSK.traefik.stop, raise_on_non_zero_exit: false
-      end
-    end
-  end
-
-  desc "restart", "Restart existing Traefik container on servers"
-  def restart
-    with_lock do
-      stop
-      start
-    end
-  end
-
-  desc "details", "Show details about Traefik container from servers"
-  def details
-    on(MRSK.traefik_hosts) { |host| puts_by_host host, capture_with_info(*MRSK.traefik.info), type: "Traefik" }
-  end
-
-  desc "logs", "Show log lines from Traefik on servers"
-  option :since, aliases: "-s", desc: "Show logs since timestamp (e.g. 2013-01-02T13:23:37Z) or relative (e.g. 42m for 42 minutes)"
-  option :lines, type: :numeric, aliases: "-n", desc: "Number of log lines to pull from each server"
-  option :grep, aliases: "-g", desc: "Show lines with grep match only (use this to fetch specific requests by id)"
-  option :follow, aliases: "-f", desc: "Follow logs on primary server (or specific host set by --hosts)"
-  def logs
-    grep = options[:grep]
-
-    if options[:follow]
-      run_locally do
-        info "Following logs on #{MRSK.primary_host}..."
-        info MRSK.traefik.follow_logs(host: MRSK.primary_host, grep: grep)
-        exec MRSK.traefik.follow_logs(host: MRSK.primary_host, grep: grep)
-      end
-    else
-      since = options[:since]
-      lines = options[:lines].presence || ((since || grep) ? nil : 100) # Default to 100 lines if since or grep isn't set
-
-      on(MRSK.traefik_hosts) do |host|
-        puts_by_host host, capture(*MRSK.traefik.logs(since: since, lines: lines, grep: grep)), type: "Traefik"
-      end
-    end
-  end
-
-  desc "remove", "Remove Traefik container and image from servers"
-  def remove
-    with_lock do
-      stop
-      remove_container
-      remove_image
-    end
-  end
-
-  desc "remove_container", "Remove Traefik container from servers", hide: true
-  def remove_container
-    with_lock do
-      on(MRSK.traefik_hosts) do
-        execute *MRSK.auditor.record("Removed traefik container"), verbosity: :debug
-        execute *MRSK.traefik.remove_container
-      end
-    end
-  end
-
-  desc "remove_image", "Remove Traefik image from servers", hide: true
-  def remove_image
-    with_lock do
-      on(MRSK.traefik_hosts) do
-        execute *MRSK.auditor.record("Removed traefik image"), verbosity: :debug
-        execute *MRSK.traefik.remove_image
-      end
-    end
-  end
-end

lib/mrsk/commander.rb

@@ -1,150 +0,0 @@
-require "active_support/core_ext/enumerable"
-require "active_support/core_ext/module/delegation"
-
-class Mrsk::Commander
-  attr_accessor :verbosity, :holding_lock, :hold_lock_on_error
-
-  def initialize
-    self.verbosity = :info
-    self.holding_lock = false
-    self.hold_lock_on_error = false
-  end
-
-  def config
-    @config ||= Mrsk::Configuration.create_from(**@config_kwargs).tap do |config|
-      @config_kwargs = nil
-      configure_sshkit_with(config)
-    end
-  end
-
-  def configure(**kwargs)
-    @config, @config_kwargs = nil, kwargs
-  end
-
-  attr_reader :specific_roles, :specific_hosts
-
-  def specific_primary!
-    self.specific_hosts = [ config.primary_web_host ]
-  end
-
-  def specific_roles=(role_names)
-    @specific_roles = config.roles.select { |r| role_names.include?(r.name) } if role_names.present?
-  end
-
-  def specific_hosts=(hosts)
-    @specific_hosts = config.all_hosts & hosts if hosts.present?
-  end
-
-  def primary_host
-    specific_hosts&.first || specific_roles&.first&.primary_host || config.primary_web_host
-  end
-
-  def roles
-    (specific_roles || config.roles).select do |role|
-      ((specific_hosts || config.all_hosts) & role.hosts).any?
-    end
-  end
-
-  def hosts
-    (specific_hosts || config.all_hosts).select do |host|
-      (specific_roles || config.roles).flat_map(&:hosts).include?(host)
-    end
-  end
-
-  def boot_strategy
-    if config.boot.limit.present?
-      { in: :groups, limit: config.boot.limit, wait: config.boot.wait }
-    else
-      {}
-    end
-  end
-
-  def roles_on(host)
-    roles.select { |role| role.hosts.include?(host.to_s) }.map(&:name)
-  end
-
-  def traefik_hosts
-    specific_hosts || config.traefik_hosts
-  end
-
-  def accessory_hosts
-    specific_hosts || config.accessories.flat_map(&:hosts)
-  end
-
-  def accessory_names
-    config.accessories&.collect(&:name) || []
-  end
-
-
-  def app(role: nil)
-    Mrsk::Commands::App.new(config, role: role)
-  end
-
-  def accessory(name)
-    Mrsk::Commands::Accessory.new(config, name: name)
-  end
-
-  def auditor(**details)
-    Mrsk::Commands::Auditor.new(config, **details)
-  end
-
-  def builder
-    @builder ||= Mrsk::Commands::Builder.new(config)
-  end
-
-  def docker
-    @docker ||= Mrsk::Commands::Docker.new(config)
-  end
-
-  def healthcheck
-    @healthcheck ||= Mrsk::Commands::Healthcheck.new(config)
-  end
-
-  def hook
-    @hook ||= Mrsk::Commands::Hook.new(config)
-  end
-
-  def lock
-    @lock ||= Mrsk::Commands::Lock.new(config)
-  end
-
-  def prune
-    @prune ||= Mrsk::Commands::Prune.new(config)
-  end
-
-  def registry
-    @registry ||= Mrsk::Commands::Registry.new(config)
-  end
-
-  def traefik
-    @traefik ||= Mrsk::Commands::Traefik.new(config)
-  end
-
-  def with_verbosity(level)
-    old_level = self.verbosity
-
-    self.verbosity = level
-    SSHKit.config.output_verbosity = level
-
-    yield
-  ensure
-    self.verbosity = old_level
-    SSHKit.config.output_verbosity = old_level
-  end
-
-  def holding_lock?
-    self.holding_lock
-  end
-
-  def hold_lock_on_error?
-    self.hold_lock_on_error
-  end
-
-  private
-    # Lazy setup of SSHKit
-    def configure_sshkit_with(config)
-      SSHKit::Backend::Netssh.configure { |ssh| ssh.ssh_options = config.ssh_options }
-      SSHKit.config.command_map[:docker] = "docker" # No need to use /usr/bin/env, just clogs up the logs
-      SSHKit.config.output_verbosity = verbosity
-    end
-end

lib/mrsk/commands.rb

@@ -1,2 +0,0 @@
-module Mrsk::Commands
-end

lib/mrsk/commands/app.rb

@@ -1,164 +0,0 @@
-class Mrsk::Commands::App < Mrsk::Commands::Base
-  attr_reader :role
-
-  def initialize(config, role: nil)
-    super(config)
-    @role = role
-  end
-
-  def start_or_run
-    combine start, run, by: "||"
-  end
-
-  def run
-    role = config.role(self.role)
-
-    docker :run,
-      "--detach",
-      "--restart unless-stopped",
-      "--name", container_name,
-      "-e", "MRSK_CONTAINER_NAME=\"#{container_name}\"",
-      *role.env_args,
-      *role.health_check_args,
-      *config.logging_args,
-      *config.volume_args,
-      *role.label_args,
-      *role.option_args,
-      config.absolute_image,
-      role.cmd
-  end
-
-  def start
-    docker :start, container_name
-  end
-
-  def status(version:)
-    pipe container_id_for_version(version), xargs(docker(:inspect, "--format", DOCKER_HEALTH_STATUS_FORMAT))
-  end
-
-  def stop(version: nil)
-    pipe \
-      version ? container_id_for_version(version) : current_running_container_id,
-      xargs(config.stop_wait_time ? docker(:stop, "-t", config.stop_wait_time) : docker(:stop))
-  end
-
-  def info
-    docker :ps, *filter_args
-  end
-
-
-  def logs(since: nil, lines: nil, grep: nil)
-    pipe \
-      current_running_container_id,
-      "xargs docker logs#{" --since #{since}" if since}#{" --tail #{lines}" if lines} 2>&1",
-      ("grep '#{grep}'" if grep)
-  end
-
-  def follow_logs(host:, grep: nil)
-    run_over_ssh \
-      pipe(
-        current_running_container_id,
-        "xargs docker logs --timestamps --tail 10 --follow 2>&1",
-        (%(grep "#{grep}") if grep)
-      ),
-      host: host
-  end
-
-
-  def execute_in_existing_container(*command, interactive: false)
-    docker :exec,
-      ("-it" if interactive),
-      container_name,
-      *command
-  end
-
-  def execute_in_new_container(*command, interactive: false)
-    docker :run,
-      ("-it" if interactive),
-      "--rm",
-      *config.env_args,
-      *config.volume_args,
-      config.absolute_image,
-      *command
-  end
-
-  def execute_in_existing_container_over_ssh(*command, host:)
-    run_over_ssh execute_in_existing_container(*command, interactive: true), host: host
-  end
-
-  def execute_in_new_container_over_ssh(*command, host:)
-    run_over_ssh execute_in_new_container(*command, interactive: true), host: host
-  end
-
-
-  def current_running_container_id
-    docker :ps, "--quiet", *filter_args(status: :running), "--latest"
-  end
-
-  def container_id_for_version(version, only_running: false)
-    container_id_for(container_name: container_name(version), only_running: only_running)
-  end
-
-  def current_running_version
-    list_versions("--latest", status: :running)
-  end
-
-  def list_versions(*docker_args, status: nil)
-    pipe \
-      docker(:ps, *filter_args(status: status), *docker_args, "--format", '"{{.Names}}"'),
-      %(grep -oE "\\-[^-]+$"), # Extract SHA from "service-role-dest-SHA"
-      %(cut -c 2-)
-  end
-
-  def list_containers
-    docker :container, :ls, "--all", *filter_args
-  end
-
-  def list_container_names
-    [ *list_containers, "--format", "'{{ .Names }}'" ]
-  end
-
-  def remove_container(version:)
-    pipe \
-      container_id_for(container_name: container_name(version)),
-      xargs(docker(:container, :rm))
-  end
-
-  def rename_container(version:, new_version:)
-    docker :rename, container_name(version), container_name(new_version)
-  end
-
-  def remove_containers
-    docker :container, :prune, "--force", *filter_args
-  end
-
-  def list_images
-    docker :image, :ls, config.repository
-  end
-
-  def remove_images
-    docker :image, :prune, "--all", "--force", *filter_args
-  end
-
-  def tag_current_as_latest
-    docker :tag, config.absolute_image, config.latest_image
-  end
-
-
-  private
-    def container_name(version = nil)
-      [ config.service, role, config.destination, version || config.version ].compact.join("-")
-    end
-
-    def filter_args(status: nil)
-      argumentize "--filter", filters(status: status)
-    end
-
-    def filters(status: nil)
-      [ "label=service=#{config.service}" ].tap do |filters|
-        filters << "label=destination=#{config.destination}" if config.destination
-        filters << "label=role=#{role}" if role
-        filters << "status=#{status}" if status
-      end
-    end
-end

lib/mrsk/commands/builder.rb

@@ -1,56 +0,0 @@
-class Mrsk::Commands::Builder < Mrsk::Commands::Base
-  delegate :create, :remove, :push, :clean, :pull, :info, to: :target
-
-  def name
-    target.class.to_s.remove("Mrsk::Commands::Builder::").underscore.inquiry
-  end
-
-  def target
-    case
-    when config.builder && config.builder["multiarch"] == false
-      native
-    when config.builder && config.builder["local"] && config.builder["remote"]
-      multiarch_remote
-    when config.builder && config.builder["remote"]
-      native_remote
-    else
-      multiarch
-    end
-  end
-
-  def native
-    @native ||= Mrsk::Commands::Builder::Native.new(config)
-  end
-
-  def native_remote
-    @native ||= Mrsk::Commands::Builder::Native::Remote.new(config)
-  end
-
-  def multiarch
-    @multiarch ||= Mrsk::Commands::Builder::Multiarch.new(config)
-  end
-
-  def multiarch_remote
-    @multiarch_remote ||= Mrsk::Commands::Builder::Multiarch::Remote.new(config)
-  end
-
-
-  def ensure_local_dependencies_installed
-    if name.native?
-      ensure_local_docker_installed
-    else
-      combine \
-        ensure_local_docker_installed,
-        ensure_local_buildx_installed
-    end
-  end
-
-  private
-    def ensure_local_docker_installed
-      docker "--version"
-    end
-
-    def ensure_local_buildx_installed
-      docker :buildx, "version"
-    end
-end

lib/mrsk/commands/builder/base.rb

@@ -1,64 +0,0 @@
-
-class Mrsk::Commands::Builder::Base < Mrsk::Commands::Base
-  class BuilderError < StandardError; end
-
-  delegate :argumentize, to: Mrsk::Utils
-
-  def clean
-    docker :image, :rm, "--force", config.absolute_image
-  end
-
-  def pull
-    docker :pull, config.absolute_image
-  end
-
-  def build_options
-    [ *build_tags, *build_labels, *build_args, *build_secrets, *build_dockerfile ]
-  end
-
-  def build_context
-    context
-  end
-
-
-  private
-    def build_tags
-      [ "-t", config.absolute_image, "-t", config.latest_image ]
-    end
-
-    def build_labels
-      argumentize "--label", { service: config.service }
-    end
-
-    def build_args
-      argumentize "--build-arg", args, sensitive: true
-    end
-
-    def build_secrets
-      argumentize "--secret", secrets.collect { |secret| [ "id", secret ] }
-    end
-
-    def build_dockerfile
-      if Pathname.new(File.expand_path(dockerfile)).exist?
-        argumentize "--file", dockerfile
-      else
-        raise BuilderError, "Missing #{dockerfile}"
-      end
-    end
-
-    def args
-      (config.builder && config.builder["args"]) || {}
-    end
-
-    def secrets
-      (config.builder && config.builder["secrets"]) || []
-    end
-
-    def dockerfile
-      (config.builder && config.builder["dockerfile"]) || "Dockerfile"
-    end
-
-    def context
-      (config.builder && config.builder["context"]) || "."
-    end
-end

lib/mrsk/commands/builder/multiarch.rb

@@ -1,29 +0,0 @@
-class Mrsk::Commands::Builder::Multiarch < Mrsk::Commands::Builder::Base
-  def create
-    docker :buildx, :create, "--use", "--name", builder_name
-  end
-
-  def remove
-    docker :buildx, :rm, builder_name
-  end
-
-  def push
-    docker :buildx, :build,
-      "--push",
-      "--platform", "linux/amd64,linux/arm64",
-      "--builder", builder_name,
-      *build_options,
-      build_context
-  end
-
-  def info
-    combine \
-      docker(:context, :ls),
-      docker(:buildx, :ls)
-  end
-
-  private
-    def builder_name
-      "mrsk-#{config.service}-multiarch"
-    end
-end

lib/mrsk/commands/builder/native.rb

@@ -1,20 +0,0 @@
-class Mrsk::Commands::Builder::Native < Mrsk::Commands::Builder::Base
-  def create
-    # No-op on native
-  end
-
-  def remove
-    # No-op on native
-  end
-
-  def push
-    combine \
-      docker(:build, *build_options, build_context),
-      docker(:push, config.absolute_image),
-      docker(:push, config.latest_image)
-  end
-
-  def info
-    # No-op on native
-  end
-end

lib/mrsk/commands/docker.rb

@@ -1,21 +0,0 @@
-class Mrsk::Commands::Docker < Mrsk::Commands::Base
-  # Install Docker using the https://github.com/docker/docker-install convenience script.
-  def install
-    pipe [ :curl, "-fsSL", "https://get.docker.com" ], :sh
-  end
-
-  # Checks the Docker client version. Fails if Docker is not installed.
-  def installed?
-    docker "-v"
-  end
-
-  # Checks the Docker server version. Fails if Docker is not running.
-  def running?
-    docker :version
-  end
-
-  # Do we have superuser access to install Docker and start system services?
-  def superuser?
-    [ '[ "${EUID:-$(id -u)}" -eq 0 ]' ]
-  end
-end

lib/mrsk/commands/prune.rb

@@ -1,20 +0,0 @@
-require "active_support/duration"
-require "active_support/core_ext/numeric/time"
-
-class Mrsk::Commands::Prune < Mrsk::Commands::Base
-  def images
-    docker :image, :prune, "--force", "--filter", "label=service=#{config.service}", "--filter", "dangling=true"
-  end
-
-  def containers(keep_last: 5)
-    pipe \
-      docker(:ps, "-q", "-a", "--filter", "label=service=#{config.service}", *stopped_containers_filters),
-      "tail -n +#{keep_last + 1}",
-      "while read container_id; do docker rm $container_id; done"
-  end
-
-  private
-    def stopped_containers_filters
-      [ "created", "exited", "dead" ].flat_map { |status| ["--filter", "status=#{status}"] }
-    end
-end

lib/mrsk/commands/traefik.rb

@@ -1,98 +0,0 @@
-class Mrsk::Commands::Traefik < Mrsk::Commands::Base
-  delegate :argumentize, :argumentize_env_with_secrets, :optionize, to: Mrsk::Utils
-
-  DEFAULT_IMAGE = "traefik:v2.9"
-  CONTAINER_PORT = 80
-
-  def run
-    docker :run, "--name traefik",
-      "--detach",
-      "--restart", "unless-stopped",
-      "--publish", port,
-      "--volume", "/var/run/docker.sock:/var/run/docker.sock",
-      *env_args,
-      *config.logging_args,
-      *label_args,
-      *docker_options_args,
-      image,
-      "--providers.docker",
-      "--log.level=DEBUG",
-      *cmd_option_args
-  end
-
-  def start
-    docker :container, :start, "traefik"
-  end
-
-  def stop
-    docker :container, :stop, "traefik"
-  end
-
-  def info
-    docker :ps, "--filter", "name=^traefik$"
-  end
-
-  def logs(since: nil, lines: nil, grep: nil)
-    pipe \
-      docker(:logs, "traefik", (" --since #{since}" if since), (" --tail #{lines}" if lines), "--timestamps", "2>&1"),
-      ("grep '#{grep}'" if grep)
-  end
-
-  def follow_logs(host:, grep: nil)
-    run_over_ssh pipe(
-      docker(:logs, "traefik", "--timestamps", "--tail", "10", "--follow", "2>&1"),
-      (%(grep "#{grep}") if grep)
-    ).join(" "), host: host
-  end
-
-  def remove_container
-    docker :container, :prune, "--force", "--filter", "label=org.opencontainers.image.title=Traefik"
-  end
-
-  def remove_image
-    docker :image, :prune, "--all", "--force", "--filter", "label=org.opencontainers.image.title=Traefik"
-  end
-
-  def port
-    "#{host_port}:#{CONTAINER_PORT}"
-  end
-
-  private
-    def label_args
-      argumentize "--label", labels
-    end
-
-    def env_args
-      env_config = config.traefik["env"] || {}
-
-      if env_config.present?
-        argumentize_env_with_secrets(env_config)
-      else
-        []
-      end
-    end
-
-    def labels
-      config.traefik["labels"] || []
-    end
-
-    def image
-      config.traefik.fetch("image") { DEFAULT_IMAGE }
-    end
-
-    def docker_options_args
-      optionize(config.traefik["options"] || {})
-    end
-
-    def cmd_option_args
-      if args = config.traefik["args"]
-        optionize args, with: "="
-      else
-        []
-      end
-    end
-
-    def host_port
-      config.traefik["host_port"] || CONTAINER_PORT
-    end
-end

lib/mrsk/configuration.rb

@@ -1,246 +0,0 @@
-require "active_support/ordered_options"
-require "active_support/core_ext/string/inquiry"
-require "active_support/core_ext/module/delegation"
-require "pathname"
-require "erb"
-require "net/ssh/proxy/jump"
-
-class Mrsk::Configuration
-  delegate :service, :image, :servers, :env, :labels, :registry, :builder, :stop_wait_time, :hooks_path, to: :raw_config, allow_nil: true
-  delegate :argumentize, :argumentize_env_with_secrets, :optionize, to: Mrsk::Utils
-
-  attr_accessor :destination
-  attr_accessor :raw_config
-
-  class << self
-    def create_from(config_file:, destination: nil, version: nil)
-      raw_config = load_config_files(config_file, *destination_config_file(config_file, destination))
-
-      new raw_config, destination: destination, version: version
-    end
-
-    private
-      def load_config_files(*files)
-        files.inject({}) { |config, file| config.deep_merge! load_config_file(file) }
-      end
-
-      def load_config_file(file)
-        if file.exist?
-          YAML.load(ERB.new(IO.read(file)).result).symbolize_keys
-        else
-          raise "Configuration file not found in #{file}"
-        end
-      end
-
-      def destination_config_file(base_config_file, destination)
-        base_config_file.sub_ext(".#{destination}.yml") if destination
-      end
-  end
-
-  def initialize(raw_config, destination: nil, version: nil, validate: true)
-    @raw_config = ActiveSupport::InheritableOptions.new(raw_config)
-    @destination = destination
-    @declared_version = version
-    valid? if validate
-  end
-
-
-  def version=(version)
-    @declared_version = version
-  end
-
-  def version
-    @declared_version.presence || ENV["VERSION"] || git_version
-  end
-
-  def abbreviated_version
-    Mrsk::Utils.abbreviate_version(version)
-  end
-
-
-  def roles
-    @roles ||= role_names.collect { |role_name| Role.new(role_name, config: self) }
-  end
-
-  def role(name)
-    roles.detect { |r| r.name == name.to_s }
-  end
-
-  def accessories
-    @accessories ||= raw_config.accessories&.keys&.collect { |name| Mrsk::Configuration::Accessory.new(name, config: self) } || []
-  end
-
-  def accessory(name)
-    accessories.detect { |a| a.name == name.to_s }
-  end
-
-
-  def all_hosts
-    roles.flat_map(&:hosts).uniq
-  end
-
-  def primary_web_host
-    role(:web).primary_host
-  end
-
-  def traefik_hosts
-    roles.select(&:running_traefik?).flat_map(&:hosts).uniq
-  end
-
-  def boot
-    Mrsk::Configuration::Boot.new(config: self)
-  end
-
-
-  def repository
-    [ raw_config.registry["server"], image ].compact.join("/")
-  end
-
-  def absolute_image
-    "#{repository}:#{version}"
-  end
-
-  def latest_image
-    "#{repository}:latest"
-  end
-
-  def service_with_version
-    "#{service}-#{version}"
-  end
-
-
-  def env_args
-    if raw_config.env.present?
-      argumentize_env_with_secrets(raw_config.env)
-    else
-      []
-    end
-  end
-
-  def volume_args
-    if raw_config.volumes.present?
-      argumentize "--volume", raw_config.volumes
-    else
-      []
-    end
-  end
-
-  def logging_args
-    if raw_config.logging.present?
-      optionize({ "log-driver" => raw_config.logging["driver"] }.compact) +
-        argumentize("--log-opt", raw_config.logging["options"])
-    else
-      argumentize("--log-opt", { "max-size" => "10m" })
-    end
-  end
-
-
-  def ssh_user
-    if raw_config.ssh.present?
-      raw_config.ssh["user"] || "root"
-    else
-      "root"
-    end
-  end
-
-  def ssh_proxy
-    if raw_config.ssh.present? && raw_config.ssh["proxy"]
-      Net::SSH::Proxy::Jump.new \
-        raw_config.ssh["proxy"].include?("@") ? raw_config.ssh["proxy"] : "root@#{raw_config.ssh["proxy"]}"
-    elsif raw_config.ssh.present? && raw_config.ssh["proxy_command"]
-      Net::SSH::Proxy::Command.new(raw_config.ssh["proxy_command"])
-    end
-  end
-
-  def ssh_options
-    { user: ssh_user, proxy: ssh_proxy, auth_methods: [ "publickey" ] }.compact
-  end
-
-
-  def healthcheck
-    { "path" => "/up", "port" => 3000, "max_attempts" => 7 }.merge(raw_config.healthcheck || {})
-  end
-
-  def readiness_delay
-    raw_config.readiness_delay || 7
-  end
-
-  def valid?
-    ensure_required_keys_present && ensure_env_available
-  end
-
-
-  def to_h
-    {
-      roles: role_names,
-      hosts: all_hosts,
-      primary_host: primary_web_host,
-      version: version,
-      repository: repository,
-      absolute_image: absolute_image,
-      service_with_version: service_with_version,
-      env_args: env_args,
-      volume_args: volume_args,
-      ssh_options: ssh_options,
-      builder: raw_config.builder,
-      accessories: raw_config.accessories,
-      logging: logging_args,
-      healthcheck: healthcheck
-    }.compact
-  end
-
-  def traefik
-    raw_config.traefik || {}
-  end
-
-  def hooks_path
-    raw_config.hooks_path || ".mrsk/hooks"
-  end
-
-  private
-    # Will raise ArgumentError if any required config keys are missing
-    def ensure_required_keys_present
-      %i[ service image registry servers ].each do |key|
-        raise ArgumentError, "Missing required configuration for #{key}" unless raw_config[key].present?
-      end
-
-      if raw_config.registry["username"].blank?
-        raise ArgumentError, "You must specify a username for the registry in config/deploy.yml"
-      end
-
-      if raw_config.registry["password"].blank?
-        raise ArgumentError, "You must specify a password for the registry in config/deploy.yml (or set the ENV variable if that's used)"
-      end
-
-      roles.each do |role|
-        if role.hosts.empty?
-          raise ArgumentError, "No servers specified for the #{role.name} role"
-        end
-      end
-
-      true
-    end
-
-    # Will raise KeyError if any secret ENVs are missing
-    def ensure_env_available
-      env_args
-      roles.each(&:env_args)
-
-      true
-    end
-
-    def role_names
-      raw_config.servers.is_a?(Array) ? [ "web" ] : raw_config.servers.keys.sort
-    end
-
-    def git_version
-      @git_version ||=
-        if system("git rev-parse")
-          uncommitted_suffix = `git status --porcelain`.strip.present? ? "_uncommitted_#{SecureRandom.hex(8)}" : ""
-
-          "#{`git rev-parse HEAD`.strip}#{uncommitted_suffix}"
-        else
-          raise "Can't use commit hash as version, no git repository found in #{Dir.pwd}"
-        end
-    end
-end