Bump version for 0.1.0

Switch to proper standalone executable with Thor

Gemfile

@@ -4,3 +4,4 @@ git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 gemspec
 
 gem "debug"
+gem "railties"

Gemfile.lock

@@ -1,9 +1,10 @@
 PATH
   remote: .
   specs:
-    mrsk (0.0.3)
-      railties (>= 7.0.0)
+    mrsk (0.1.0)
+      activesupport (>= 7.0)
       sshkit (~> 1.21)
+      thor (~> 1.2)
 
 GEM
   remote: https://rubygems.org/
@@ -46,11 +47,11 @@ GEM
     net-scp (4.0.0)
       net-ssh (>= 2.6.5, < 8.0.0)
     net-ssh (7.0.1)
-    nokogiri (1.14.0.rc1-arm64-darwin)
+    nokogiri (1.14.0-arm64-darwin)
       racc (~> 1.4)
-    nokogiri (1.14.0.rc1-x86_64-darwin)
+    nokogiri (1.14.0-x86_64-darwin)
       racc (~> 1.4)
-    nokogiri (1.14.0.rc1-x86_64-linux)
+    nokogiri (1.14.0-x86_64-linux)
       racc (~> 1.4)
     racc (1.6.2)
     rack (2.2.5)
@@ -90,6 +91,7 @@ PLATFORMS
 DEPENDENCIES
   debug
   mrsk!
+  railties
 
 BUNDLED WITH
    2.4.3

README.md

@@ -1,10 +1,10 @@
 # MRSK
 
-MRSK ships zero-downtime deploys of Rails apps packed as containers to any host. It uses the dynamic reverse-proxy Traefik to hold requests while the new application container is started and the old one is wound down. It works seamlessly across multiple hosts, using SSHKit to execute commands.
+MRSK deploys Rails apps in containers to servers running 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.
 
 ## Installation
 
-Add the gem with `bundle add mrsk`, then run `rake mrsk:init`, and then edit the new file in `config/deploy.yml`. It could look as simple as this:
+Install MRSK globally with `gem install mrsk`. Then, inside your app directory, run `mrsk install`. Now edit the new file `config/deploy.yml`. It could look as simple as this:
 
 ```yaml
 service: hey
@@ -13,34 +13,27 @@ servers:
   - 192.168.0.1
   - 192.168.0.2
 registry:
-  username: <%= Rails.application.credentials.registry["username"] %>
-  password: <%= Rails.application.credentials.registry["password"] %>
-```
-
-Then ensure your encrypted credentials have the registry username + password by editing them with `rails credentials:edit`:
-
-```
-registry:
-  username: real-user-name
-  password: real-registry-password-or-token
+  username: registry-user-name
+  password: <%= ENV["MRSK_REGISTRY_PASSWORD"] %>
 ```
 
 Now you're ready to deploy a multi-arch image to the servers:
 
 ```
-./bin/mrsk deploy
+mrsk deploy
 ```
 
 This will:
 
-1. Log into the registry both locally and remotely
-2. Build the image using the standard Dockerfile in the root of the application.
-3. Push the image to the registry.
-4. Pull the image from the registry on the servers.
-5. Ensure Traefik is running and accepting traffic on port 80.
-6. Stop any containers running a previous versions of the app.
-7. Start a new container with the version of the app that matches the current git version hash.
-8. Prune unused images and stopped containers to ensure servers don't fill up.
+1. Install Docker on any server that might be missing it (using apt-get)
+2. Log into the registry both locally and remotely
+3. Build the image using the standard Dockerfile in the root of the application.
+4. Push the image to the registry.
+5. Pull the image from the registry on the servers.
+6. Ensure Traefik is running and accepting traffic on port 80.
+7. Stop any containers running a previous versions of the app.
+8. Start a new container with the version of the app that matches the current git version hash.
+9. 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.
 
@@ -53,8 +46,8 @@ The default registry for Docker is Docker Hub. If you'd like to use a different
 ```yaml
 registry:
   server: registry.digitalocean.com
-  username: <%= Rails.application.credentials.registry["username"] %>
-  password: <%= Rails.application.credentials.registry["password"] %>
+  username: registry-user-name
+  password: <%= ENV["MRSK_REGISTRY_PASSWORD"] %>
 ```
 
 ### Using a different SSH user than root
@@ -141,7 +134,7 @@ builder:
 
 Note: You must have Docker running on the remote host being used as a builder.
 
-With that configuration in place, you can setup the local/remote configuration using `./bin/mrsk build:remote:create`. If you wish to remove the contexts and buildx instances again, you can run `./bin/mrsk build:remote:remove`. If you had already built using the standard emulation setup, run `./bin/mrsk build:remove` before doing `./bin/mrsk build:remote:create`.
+With that configuration in place, you can setup the local/remote configuration using `mrsk build create`. If you wish to remove the contexts and buildx instances again, you can run `mrsk build remove`. If you had already built using the standard emulation setup, run `mrsk build remove` before doing `mrsk build remote`.
 
 ### Configuring native builder when multi-arch isn't needed
 
@@ -156,11 +149,11 @@ builder:
 
 ### Remote execution
 
-If you need to execute commands inside the Rails containers, you can use `./bin/mrsk app:exec`, `./bin/mrsk app:exec:once`, `./bin/mrsk app:exec:rails`, and `./bin/mrsk app:exec:once:rails`. Examples:
+If you need to execute commands inside the Rails containers, you can use `mrsk app exec`, `mrsk app exec --once`, `mrsk app runner`, and `mrsk app runner --once`. Examples:
 
 ```bash
 # Runs command on all servers
-./bin/mrsk app:exec CMD='ruby -v'
+mrsk app exec 'ruby -v'
 App Host: xxx.xxx.xxx.xxx
 ruby 3.1.3p185 (2022-11-24 revision 1a6b16756e) [x86_64-linux]
 
@@ -168,11 +161,11 @@ App Host: xxx.xxx.xxx.xxx
 ruby 3.1.3p185 (2022-11-24 revision 1a6b16756e) [x86_64-linux]
 
 # Runs command on first server
-./bin/mrsk app:exec:once CMD='cat .ruby-version'
+mrsk app exec --once 'cat .ruby-version'
 3.1.3
 
 # Runs Rails command on all servers
-./bin/mrsk app:exec:rails CMD=about
+mrsk app exec 'bin/rails about'
 App Host: xxx.xxx.xxx.xxx
 About your application's environment
 Rails version             7.1.0.alpha
@@ -197,19 +190,18 @@ Environment               production
 Database adapter          sqlite3
 Database schema version   20221231233303
 
-# Runs Rails command on first server
-./bin/mrsk app:exec:once:rails CMD='db:version'
-database: storage/production.sqlite3
-Current version: 20221231233303
+# Runs Rails runner on first server
+mrsk app runner 'puts Rails.application.config.time_zone'
+UTC
 ```
 
 ### Running a Rails console on the primary host
 
-If you need to interact with the production console for the app, you can use `./bin/mrsk app:console`, which will start a Rails console session on the primary host. Be mindful that this is a live wire! Any changes made to the production database will take effect immeditately.
+If you need to interact with the production console for the app, you can use `mrsk app console`, which will start a Rails console session on the primary host. You can start the console on a different host using `mrsk app console --host 192.168.0.2`. Be mindful that this is a live wire! Any changes made to the production database will take effect immeditately.
 
 ### Inspecting
 
-You can see the state of your servers by running `./bin/mrsk info`. It'll show something like this:
+You can see the state of your servers by running `mrsk details`. It'll show something like this:
 
 ```
 Traefik Host: xxx.xxx.xxx.xxx
@@ -229,11 +221,11 @@ CONTAINER ID   IMAGE
 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 `./bin/mrsk app:info` or just for Traefik with `./bin/mrsk traefik:info`.
+You can also see just info for app containers with `mrsk app details` or just for Traefik with `mrsk traefik details`.
 
 ### Rollback
 
-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 `./bin/mrsk app:containers`. It'll give you a presentation similar to `./bin/mrsk app:info`, but include all the old containers as well. Showing something like this:
+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: 164.92.105.119
@@ -247,20 +239,17 @@ badb1aa51db4   registry.digitalocean.com/user/app:6ef8a6a84c525b123c5245345a8483
 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 `./bin/mrsk rollback VERSION=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.
+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 `./bin/mrsk deploy`.
+Note that by default old containers are pruned after 3 days when you run `mrsk deploy`.
 
 ### Removing
 
-If you wish to remove the entire application, including Traefik, containers, images, and registry session, you can run `./bin/mrsk remove`. This will leave the servers clean.
+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.
 
 ## Stage of development
 
-This is alpha software. Lots of stuff is missing. Here are some of the areas we seek to improve:
-
-- Adapterize commands to work with Podman and other container runners
-- Integrate with cloud CI pipelines
+This is alpha software. Lots of stuff is missing. Lots of stuff will keep moving around for a while.
 
 ## License
 

bin/mrsk

@@ -0,0 +1,5 @@
+#!/usr/bin/env ruby
+
+require "mrsk/cli"
+
+Mrsk::Cli::Main.start(ARGV)

lib/mrsk.rb

@@ -2,5 +2,4 @@ module Mrsk
 end
 
 require "mrsk/version"
-require "mrsk/engine"
 require "mrsk/commander"

lib/mrsk/cli.rb

@@ -0,0 +1,9 @@
+require "mrsk"
+
+MRSK = Mrsk::Commander.new \
+  config_file: Pathname.new(File.expand_path("config/deploy.yml"))
+
+module Mrsk::Cli
+end
+
+require "mrsk/cli/main"

lib/mrsk/cli/app.rb

@@ -0,0 +1,97 @@
+require "mrsk/cli/base"
+
+class Mrsk::Cli::App < Mrsk::Cli::Base
+  desc "boot", "Boot app on servers (or start them if they've already been booted)"
+  def boot
+    MRSK.config.roles.each do |role|
+      on(role.hosts) do |host|
+        begin
+          execute *MRSK.app.run(role: role.name)
+        rescue SSHKit::Command::Failed => e
+          if e.message =~ /already in use/
+            error "Container with same version already deployed on #{host}, starting that instead"
+            execute *MRSK.app.start, host: host
+          else
+            raise
+          end
+        end
+      end
+    end
+  end
+  
+  desc "start", "Start existing app on servers (use --version=<git-hash> to designate specific version)"
+  option :version, desc: "Defaults to the most recent git-hash in local repository"
+  def start
+    if (version = options[:version]).present?
+      on(MRSK.config.hosts) { execute *MRSK.app.start(version: version) }
+    else
+      on(MRSK.config.hosts) { execute *MRSK.app.start, raise_on_non_zero_exit: false }
+    end
+  end
+  
+  desc "stop", "Stop app on servers"
+  def stop
+    on(MRSK.config.hosts) { execute *MRSK.app.stop, raise_on_non_zero_exit: false }
+  end
+  
+  desc "details", "Display details about app containers"
+  def details
+    on(MRSK.config.hosts) { |host| puts "App Host: #{host}\n" + capture(*MRSK.app.info, verbosity: Logger::INFO) + "\n\n" }
+  end
+  
+  desc "exec [CMD]", "Execute a custom task on servers passed in as CMD='bin/rake some:task'"
+  option :once, type: :boolean, default: false
+  def exec(cmd)
+    if options[:once]
+      on(MRSK.config.primary_host) { puts capture(*MRSK.app.exec(cmd), verbosity: Logger::INFO) }
+    else
+      on(MRSK.config.hosts) { |host| puts "App Host: #{host}\n" + capture(*MRSK.app.exec(cmd), verbosity: Logger::INFO) + "\n\n" }
+    end
+  end
+  
+  desc "console", "Start Rails Console on primary host"
+  option :host, desc: "Start console on a different host"
+  def console
+    host = options[:host] || MRSK.config.primary_host
+
+    run_locally do
+      puts "Launching Rails console on #{host}..."
+      exec MRSK.app.console(host: host)        
+    end
+  end
+
+  desc "runner [EXPRESSION]", "Execute Rails runner with given expression"
+  option :once, type: :boolean, default: false, desc: 
+  def runner(expression)
+    if options[:once]
+      on(MRSK.config.primary_host) { puts capture(*MRSK.app.exec("bin/rails", "runner", "'#{expression}'"), verbosity: Logger::INFO) }
+    else
+      on(MRSK.config.hosts) { |host| puts "App Host: #{host}\n" + capture(*MRSK.app.exec("bin/rails", "runner", "'#{expression}'"), verbosity: Logger::INFO) + "\n\n" }
+    end
+  end
+
+  desc "containers", "List all the app containers currently on servers"
+  def containers
+    on(MRSK.config.hosts) { |host| puts "App Host: #{host}\n" + capture(*MRSK.app.list_containers, verbosity: Logger::INFO) + "\n\n" }
+  end
+  
+  desc "logs", "Show last 100 log lines from app on servers"
+  def logs
+    # FIXME: Catch when app containers aren't running
+    on(MRSK.config.hosts) { |host| puts "App Host: #{host}\n" + capture(*MRSK.app.logs) + "\n\n" }
+  end
+  
+  desc "remove", "Remove app containers and images from servers"
+  option :only, default: "", desc: "Use 'containers' or 'images'"
+  def remove
+    case options[:only]
+    when "containers"
+      on(MRSK.config.hosts) { execute *MRSK.app.remove_containers }
+    when "images"
+      on(MRSK.config.hosts) { execute *MRSK.app.remove_images }
+    else
+      on(MRSK.config.hosts) { execute *MRSK.app.remove_containers }
+      on(MRSK.config.hosts) { execute *MRSK.app.remove_images }
+    end
+  end
+end

lib/mrsk/cli/base.rb

@@ -0,0 +1,27 @@
+require "thor"
+require "sshkit"
+require "sshkit/dsl"
+
+module Mrsk::Cli
+  class Base < Thor
+    include SSHKit::DSL
+
+    def self.exit_on_failure?() true end
+
+    class_option :verbose, type: :boolean, aliases: "-v", desc: "Detailed logging"
+
+    def initialize(*)
+      super
+      MRSK.verbose = options[:verbose]
+    end
+
+    private
+      def print_runtime
+        started_at = Time.now
+        yield
+      ensure
+        runtime = Time.now - started_at
+        puts "  Finished all in #{sprintf("%.1f seconds", runtime)}"
+      end
+  end
+end

lib/mrsk/cli/build.rb

@@ -0,0 +1,53 @@
+require "mrsk/cli/base"
+
+class Mrsk::Cli::Build < Mrsk::Cli::Base
+  desc "deliver", "Deliver a newly built app image to servers"
+  def deliver
+    invoke :push
+    invoke :pull
+  end
+
+  desc "push", "Build locally and push app image to registry"
+  def push
+    run_locally do 
+      begin
+        debug "Using builder: #{MRSK.builder.name}"
+        info "Building image may take a while (run with --verbose for progress logging)"
+        execute *MRSK.builder.push
+      rescue SSHKit::Command::Failed => e
+        error "Missing compatible builder, so creating a new one first"
+        execute *MRSK.builder.create
+        execute *MRSK.builder.push
+      end
+    end
+  end
+
+  desc "pull", "Pull app image from the registry onto servers"
+  def pull
+    on(MRSK.config.hosts) { execute *MRSK.builder.pull }
+  end
+
+  desc "create", "Create a local build setup"
+  def create
+    run_locally do
+      debug "Using builder: #{MRSK.builder.name}"
+      execute *MRSK.builder.create
+    end
+  end
+
+  desc "remove", "Remove local build setup"
+  def remove
+    run_locally do
+      debug "Using builder: #{MRSK.builder.name}"
+      execute *MRSK.builder.remove
+    end
+  end
+
+  desc "details", "Show the name of the configured builder"
+  def details
+    run_locally do
+      puts "Builder: #{MRSK.builder.name} (#{MRSK.builder.target.class.name})"
+      puts capture(*MRSK.builder.info)
+    end
+  end
+end

lib/mrsk/cli/main.rb

@@ -0,0 +1,99 @@
+require "mrsk/cli/base"
+
+require "mrsk/cli/app"
+require "mrsk/cli/build"
+require "mrsk/cli/prune"
+require "mrsk/cli/registry"
+require "mrsk/cli/server"
+require "mrsk/cli/traefik"
+
+class Mrsk::Cli::Main < Mrsk::Cli::Base
+  desc "deploy", "Deploy the app to servers"
+  def deploy
+    print_runtime do
+      invoke "mrsk:cli:server:bootstrap"
+      invoke "mrsk:cli:registry:login"
+      invoke "mrsk:cli:build:deliver"
+      invoke "mrsk:cli:traefik:boot"
+      invoke "mrsk:cli:app:stop"
+      invoke "mrsk:cli:app:boot"
+      invoke "mrsk:cli:prune:all"
+    end
+  end
+
+  desc "redeploy", "Deploy new version of the app to servers (without bootstrapping servers, starting Traefik, pruning, and registry login)"
+  def redeploy
+    print_runtime do
+      invoke "mrsk:cli:build:deliver"
+      invoke "mrsk:cli:app:stop"
+      invoke "mrsk:cli:app:boot"
+    end
+  end
+
+  desc "rollback [VERSION]", "Rollback the app to VERSION (that must already be on servers)"
+  def rollback(version)
+    on(MRSK.config.hosts) do
+      execute *MRSK.app.stop, raise_on_non_zero_exit: false
+      execute *MRSK.app.start(version: version)
+    end
+  end
+
+  desc "details", "Display details about Traefik and app containers"
+  def details
+    invoke "mrsk:cli:traefik:details"
+    invoke "mrsk:cli:app:details"
+  end
+
+  desc "install", "Create config stub in config/deploy.yml and binstub in bin/mrsk"
+  option :skip_binstub, type: :boolean, default: false, desc: "Skip adding MRSK to the Gemfile and creating bin/mrsk binstub"
+  def install
+    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.cp_r Pathname.new(File.expand_path("templates/deploy.yml", __dir__)), deploy_file
+      puts "Created configuration file in config/deploy.yml"
+    end
+
+    unless options[:skip_binstub]
+      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
+        `bundle add mrsk`
+        `bundle binstubs mrsk`
+        puts "Created binstub file in bin/mrsk"
+      end
+    end
+  end
+
+  desc "remove", "Remove Traefik, app, and registry session from servers"
+  def remove
+    invoke "mrsk:cli:traefik:remove"
+    invoke "mrsk:cli:app:remove"
+    invoke "mrsk:cli:registry:logout"
+  end
+
+  desc "version", "Display the MRSK version"
+  def version
+    puts Mrsk::VERSION
+  end
+
+  desc "app", "Manage the application"
+  subcommand "app", Mrsk::Cli::App
+
+  desc "build", "Build the application image"
+  subcommand "build", Mrsk::Cli::Build
+
+  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 Docker"
+  subcommand "server", Mrsk::Cli::Server
+
+  desc "traefik", "Manage the Traefik load balancer"
+  subcommand "traefik", Mrsk::Cli::Traefik
+end

lib/mrsk/cli/prune.rb

@@ -0,0 +1,19 @@
+require "mrsk/cli/base"
+
+class Mrsk::Cli::Prune < Mrsk::Cli::Base
+  desc "all", "Prune unused images and stopped containers"
+  def all
+    invoke :containers
+    invoke :images
+  end
+
+  desc "images", "Prune unused images older than 30 days"
+  def images
+    on(MRSK.config.hosts) { execute *MRSK.prune.images }
+  end
+
+  desc "containers", "Prune stopped containers for the service older than 3 days"
+  def containers
+    on(MRSK.config.hosts) { execute *MRSK.prune.containers }
+  end
+end

lib/mrsk/cli/registry.rb

@@ -0,0 +1,14 @@
+require "mrsk/cli/base"
+
+class Mrsk::Cli::Registry < Mrsk::Cli::Base
+  desc "login", "Login to the registry locally and remotely"
+  def login
+    run_locally           { execute *MRSK.registry.login }
+    on(MRSK.config.hosts) { execute *MRSK.registry.login }
+  end
+
+  desc "logout", "Logout of the registry remotely"
+  def logout
+    on(MRSK.config.hosts) { execute *MRSK.registry.logout }
+  end
+end

lib/mrsk/cli/server.rb

@@ -0,0 +1,8 @@
+require "mrsk/cli/base"
+
+class Mrsk::Cli::Server < Mrsk::Cli::Base
+  desc "bootstrap", "Ensure Docker is installed on the servers"
+  def bootstrap
+    on(MRSK.config.hosts) { execute "which docker || apt-get install docker.io -y" }
+  end
+end

lib/mrsk/cli/templates/deploy.yml

@@ -0,0 +1,17 @@
+# Name of your application. Used to uniquely configuring Traefik and app containers.
+# Your Dockerfile should set LABEL service=the-same-value to ensure image pruning works.
+service: my-app
+
+# Name of the container image.
+image: user/my-app
+
+# Deploy to these servers.
+servers:
+  - 192.168.0.1
+
+# Credentials for your image host.
+registry:
+  # Specify the registry server, if you're not using Docker Hub
+  # server: registry.digitalocean.com / ghcr.io / ...
+  username: my-user
+  password: my-password-should-go-somewhere-safe

lib/mrsk/cli/traefik.rb

@@ -0,0 +1,44 @@
+require "mrsk/cli/base"
+
+class Mrsk::Cli::Traefik < Mrsk::Cli::Base
+  desc "boot", "Boot Traefik on servers"
+  def boot
+    on(MRSK.config.role(:web).hosts) { execute *MRSK.traefik.run, raise_on_non_zero_exit: false }
+  end
+
+  desc "start", "Start existing Traefik on servers"
+  def start
+    on(MRSK.config.role(:web).hosts) { execute *MRSK.traefik.start, raise_on_non_zero_exit: false }
+  end
+
+  desc "stop", "Stop Traefik on servers"
+  def stop
+    on(MRSK.config.role(:web).hosts) { execute *MRSK.traefik.stop, raise_on_non_zero_exit: false }
+  end
+
+  desc "restart", "Restart Traefik on servers"
+  def restart
+    invoke :stop
+    invoke :start
+  end
+
+  desc "details", "Display details about Traefik containers from servers"
+  def details
+    on(MRSK.config.role(:web).hosts) { |host| puts "Traefik Host: #{host}\n" + capture(*MRSK.traefik.info, verbosity: Logger::INFO) + "\n\n" }
+  end
+
+  desc "logs", "Show last 100 log lines from Traefik on servers"
+  def logs
+    on(MRSK.config.hosts) { |host| puts "Traefik Host: #{host}\n" + capture(*MRSK.traefik.logs) + "\n\n" }
+  end
+
+  desc "remove", "Remove Traefik container and image from servers"
+  def remove
+    invoke :stop
+
+    on(MRSK.config.role(:web).hosts) do
+      execute *MRSK.traefik.remove_container
+      execute *MRSK.traefik.remove_image
+    end
+  end
+end

lib/mrsk/commander.rb

@@ -6,14 +6,15 @@ require "mrsk/commands/traefik"
 require "mrsk/commands/registry"
 
 class Mrsk::Commander
-  attr_reader :config_file, :config, :verbose
+  attr_reader :config
+  attr_accessor :verbose
 
-  def initialize(config_file:, verbose: false)
-    @config_file, @verbose = config_file, verbose
+  def initialize(config_file:)
+    @config_file = config_file
   end
 
   def config
-    @config ||= Mrsk::Configuration.load_file(config_file).tap { |config| setup_with(config) }
+    @config ||= Mrsk::Configuration.load_file(@config_file).tap { |config| setup_with(config) }
   end
 
 

lib/mrsk/commands/app.rb

@@ -15,8 +15,8 @@ class Mrsk::Commands::App < Mrsk::Commands::Base
       role.cmd
   end
 
-  def start
-    docker :start, config.service_with_version
+  def start(version: config.version)
+    docker :start, "#{config.service}-#{version}"
   end
 
   def stop
@@ -40,8 +40,8 @@ class Mrsk::Commands::App < Mrsk::Commands::Base
       *command
   end
 
-  def console
-    "ssh -t #{config.ssh_user}@#{config.primary_host} '#{exec("bin/rails", "c", interactive: true).join(" ")}'"
+  def console(host: config.primary_host)
+    "ssh -t #{config.ssh_user}@#{host} '#{exec("bin/rails", "c", interactive: true).join(" ")}'"
   end
 
   def list_containers

lib/mrsk/commands/builder/multiarch.rb

@@ -2,11 +2,11 @@ require "mrsk/commands/base"
 
 class Mrsk::Commands::Builder::Multiarch < Mrsk::Commands::Base
   def create
-    docker :buildx, :create, "--use", "--name", "mrsk"
+    docker :buildx, :create, "--use", "--name", builder_name
   end
 
   def remove
-    docker :buildx, :rm, "mrsk"
+    docker :buildx, :rm, builder_name
   end
 
   def push
@@ -22,4 +22,9 @@ class Mrsk::Commands::Builder::Multiarch < Mrsk::Commands::Base
       docker(:context, :ls),
       docker(:buildx, :ls)
   end
+
+  private
+    def builder_name
+      "mrsk-#{config.service}"
+    end
 end

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

@@ -16,11 +16,11 @@ class Mrsk::Commands::Builder::Multiarch::Remote < Mrsk::Commands::Builder::Mult
 
   private
     def create_local_buildx
-      docker :buildx, :create, "--use", "--name", "mrsk", "mrsk-#{local["arch"]}", "--platform", "linux/#{local["arch"]}"
+      docker :buildx, :create, "--use", "--name", builder_name, builder_name_with_arch(local["arch"]), "--platform", "linux/#{local["arch"]}"
     end
 
     def append_remote_buildx
-      docker :buildx, :create, "--append", "--name", "mrsk", "mrsk-#{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
@@ -30,7 +30,7 @@ class Mrsk::Commands::Builder::Multiarch::Remote < Mrsk::Commands::Builder::Mult
     end
 
     def create_context(arch, host)
-      docker :context, :create, "mrsk-#{arch}", "--description", "'MRSK #{arch} Native Host'", "--docker", "'host=#{host}'"
+      docker :context, :create, builder_name_with_arch(arch), "--description", "'#{builder_name} #{arch} native host'", "--docker", "'host=#{host}'"
     end
 
     def remove_contexts
@@ -40,7 +40,7 @@ class Mrsk::Commands::Builder::Multiarch::Remote < Mrsk::Commands::Builder::Mult
     end
 
     def remove_context(arch)
-      docker :context, :rm, "mrsk-#{arch}"
+      docker :context, :rm, builder_name_with_arch(arch)
     end
 
     def local
@@ -50,4 +50,9 @@ class Mrsk::Commands::Builder::Multiarch::Remote < Mrsk::Commands::Builder::Mult
     def remote
       config.builder["remote"]
     end
+
+    private
+      def builder_name_with_arch(arch)
+        "#{builder_name}-#{arch}"
+      end
 end

lib/mrsk/configuration.rb

@@ -1,5 +1,7 @@
 require "active_support/ordered_options"
 require "active_support/core_ext/string/inquiry"
+require "active_support/core_ext/module/delegation"
+require "pathname"
 require "erb"
 
 class Mrsk::Configuration
@@ -91,7 +93,7 @@ class Mrsk::Configuration
   end
 
   def master_key
-    ENV["RAILS_MASTER_KEY"] || File.read(Rails.root.join("config/master.key"))
+    ENV["RAILS_MASTER_KEY"] || File.read(Pathname.new(File.expand_path("config/master.key")))
   end
 
 

lib/mrsk/engine.rb

@@ -1,4 +0,0 @@
-module Mrsk
-  class Engine < ::Rails::Engine
-  end
-end

lib/mrsk/version.rb

@@ -1,3 +1,3 @@
 module Mrsk
-  VERSION = "0.0.3"
+  VERSION = "0.1.0"
 end

lib/tasks/mrsk/app.rake

@@ -1,97 +0,0 @@
-require_relative "setup"
-
-namespace :mrsk do
-  namespace :app do
-    desc "Run app on servers (or start them if they've already been run)"
-    task :run do
-      MRSK.config.roles.each do |role|
-        on(role.hosts) do |host|
-          begin
-            execute *MRSK.app.run(role: role.name)
-          rescue SSHKit::Command::Failed => e
-            if e.message =~ /already in use/
-              error "Container with same version already deployed on #{host}, starting that instead"
-              execute *MRSK.app.start, host: host
-            else
-              raise
-            end
-          end
-        end
-      end
-    end
-
-    desc "Start existing app on servers (use VERSION=<git-hash> to designate which version)"
-    task :start do
-      on(MRSK.config.hosts) { execute *MRSK.app.start, raise_on_non_zero_exit: false }
-    end
-
-    desc "Stop app on servers"
-    task :stop do
-      on(MRSK.config.hosts) { execute *MRSK.app.stop, raise_on_non_zero_exit: false }
-    end
-
-    desc "Start app on servers (use VERSION=<git-hash> to designate which version)"
-    task restart: %i[ stop start ]
-
-    desc "Display information about app containers"
-    task :info do
-      on(MRSK.config.hosts) { |host| puts "App Host: #{host}\n" + capture(*MRSK.app.info) + "\n\n" }
-    end
-
-    desc "Execute a custom task on servers passed in as CMD='bin/rake some:task'"
-    task :exec do
-      on(MRSK.config.hosts) { |host| puts "App Host: #{host}\n" + capture(*MRSK.app.exec(ENV["CMD"])) + "\n\n" }
-    end
-
-    desc "Start Rails Console on primary host"
-    task :console do
-      puts "Launching Rails console on #{MRSK.config.primary_host}..."
-      exec app.console
-    end
-
-    namespace :exec do
-      desc "Execute Rails command on servers, like CMD='runner \"puts %(Hello World)\""
-      task :rails do
-        on(MRSK.config.hosts) { |host| puts "App Host: #{host}\n" + capture(*MRSK.app.exec("bin/rails", ENV["CMD"])) + "\n\n" }
-      end
-
-      desc "Execute a custom task on the first defined server"
-      task :once do
-        on(MRSK.config.primary_host) { puts capture(*MRSK.app.exec(ENV["CMD"])) }
-      end
-
-      namespace :once do
-        desc "Execute Rails command on the first defined server, like CMD='runner \"puts %(Hello World)\""
-        task :rails do
-          on(MRSK.config.primary_host) { puts capture(*MRSK.app.exec("bin/rails", ENV["CMD"])) }
-        end
-      end
-    end
-
-    desc "List all the app containers currently on servers"
-    task :containers do
-      on(MRSK.config.hosts) { |host| puts "App Host: #{host}\n" + capture(*MRSK.app.list_containers) + "\n\n" }
-    end
-
-    desc "Show last 100 log lines from app on servers"
-    task :logs do
-      # FIXME: Catch when app containers aren't running
-      on(MRSK.config.hosts) { |host| puts "App Host: #{host}\n" + capture(*MRSK.app.logs) + "\n\n" }
-    end
-
-    desc "Remove app containers and images from servers"
-    task remove: %w[ remove:containers remove:images ]
-
-    namespace :remove do
-      desc "Remove app containers from servers"
-      task :containers do
-        on(MRSK.config.hosts) { execute *MRSK.app.remove_containers }
-      end
-      
-      desc "Remove app images from servers"
-      task :images do
-        on(MRSK.config.hosts) { execute *MRSK.app.remove_images }
-      end
-    end
-  end
-end

lib/tasks/mrsk/build.rake

@@ -1,52 +0,0 @@
-require_relative "setup"
-
-namespace :mrsk do
-  namespace :build do
-    desc "Deliver a newly built app image to servers"
-    task deliver: %i[ push pull ]
-
-    desc "Build locally and push app image to registry"
-    task :push do
-      run_locally do 
-        begin
-          debug "Using builder: #{MRSK.builder.name}"
-          info "Building image may take a while (run with VERBOSE=1 for progress logging)"
-          execute *MRSK.builder.push
-        rescue SSHKit::Command::Failed => e
-          error "Missing compatible builder, so creating a new one first"
-          execute *MRSK.builder.create
-          execute *MRSK.builder.push
-        end
-      end unless ENV["VERSION"]
-    end
-
-    desc "Pull app image from the registry onto servers"
-    task :pull do
-      on(MRSK.config.hosts) { execute *MRSK.builder.pull }
-    end
-
-    desc "Create a local build setup"
-    task :create do
-      run_locally do
-        debug "Using builder: #{MRSK.builder.name}"
-        execute *MRSK.builder.create
-      end
-    end
-
-    desc "Remove local build setup"
-    task :remove do
-      run_locally do
-        debug "Using builder: #{MRSK.builder.name}"
-        execute *MRSK.builder.remove
-      end
-    end
-
-    desc "Show the name of the configured builder"
-    task :info do
-      run_locally do
-        puts "Builder: #{MRSK.builder.name} (#{MRSK.builder.target.class.name})"
-        puts capture(*MRSK.builder.info)
-      end
-    end
-  end
-end

lib/tasks/mrsk/mrsk.rake

@@ -1,37 +0,0 @@
-require_relative "setup"
-
-namespace :mrsk do
-  desc "Deploy app for the first time to a fresh server"
-  task fresh: %w[ server:bootstrap registry:login build:deliver traefik:run app:stop app:run ]
-
-  desc "Push the latest version of the app, ensure Traefik is running, then restart app"
-  task deploy: %w[ registry:login build:deliver traefik:run app:stop app:run prune ]
-
-  desc "Rollback to VERSION=x that was already run as a container on servers"
-  task rollback: %w[ app:restart ]
-
-  desc "Display information about Traefik and app containers"
-  task info: %w[ traefik:info app:info ]
-
-  desc "Create config stub in config/deploy.yml"
-  task :init do
-    require "fileutils"
-
-    if (deploy_file = Rails.root.join("config/deploy.yml")).exist?
-      puts "Config file already exists in config/deploy.yml (remove first to create a new one)"
-    else
-      FileUtils.cp_r Pathname.new(File.expand_path("templates/deploy.yml", __dir__)), deploy_file
-      puts "Created configuration file in config/deploy.yml"
-    end
-
-    if (binstub = Rails.root.join("bin/mrsk")).exist?
-      puts "Binstub already exists in bin/mrsk (remove first to create a new one)"
-    else
-      FileUtils.cp_r Pathname.new(File.expand_path("templates/mrsk", __dir__)), binstub
-      puts "Created binstub file in bin/mrsk"
-    end
-  end
-
-  desc "Remove Traefik, app, and registry session from servers"
-  task remove: %w[ traefik:remove app:remove registry:logout ]
-end

lib/tasks/mrsk/prune.rake

@@ -1,18 +0,0 @@
-require_relative "setup"
-
-namespace :mrsk do
-  desc "Prune unused images and stopped containers"
-  task prune: %w[ prune:containers prune:images ]
-
-  namespace :prune do
-    desc "Prune unused images older than 30 days"
-    task :images do
-      on(MRSK.config.hosts) { MRSK.verbosity(:debug) { execute *MRSK.prune.images } }
-    end
-
-    desc "Prune stopped containers for the service older than 3 days"
-    task :containers do
-      on(MRSK.config.hosts) { MRSK.verbosity(:debug) { execute *MRSK.prune.containers } }
-    end
-  end
-end

lib/tasks/mrsk/registry.rake

@@ -1,16 +0,0 @@
-require_relative "setup"
-
-namespace :mrsk do
-  namespace :registry do
-    desc "Login to the registry locally and remotely"
-    task :login do
-      run_locally           { execute *MRSK.registry.login }
-      on(MRSK.config.hosts) { execute *MRSK.registry.login }
-    end
-
-    desc "Logout of the registry remotely"
-    task :logout do
-      on(MRSK.config.hosts) { execute *MRSK.registry.logout }
-    end
-  end
-end

lib/tasks/mrsk/server.rake

@@ -1,11 +0,0 @@
-require_relative "setup"
-
-namespace :mrsk do
-  namespace :server do
-    desc "Setup Docker on the remote servers"
-    task :bootstrap do
-      # FIXME: Detect when apt-get is not available and use the appropriate alternative
-      on(MRSK.config.hosts) { execute "apt-get install docker.io -y" }
-    end
-  end
-end

lib/tasks/mrsk/setup.rb

@@ -1,6 +0,0 @@
-require "sshkit"
-require "sshkit/dsl"
-
-include SSHKit::DSL
-
-MRSK = Mrsk::Commander.new config_file: Rails.root.join("config/deploy.yml"), verbose: ENV["VERBOSE"]

lib/tasks/mrsk/templates/deploy.yml

@@ -1,24 +0,0 @@
-# Name of your application will be used for uniquely configuring Traefik and app containers.
-# Your Dockerfile should set LABEL service=the-same-value to ensure image pruning works.
-service: my-app
-
-# Name of the container image
-image: user/my-app
-
-# All the servers targeted for deploy. You can reference a single server for a command by using SERVERS=192.168.0.1
-servers:
-  - 192.168.0.1
-
-# The following envs are made available to the container when started
-env:
-  # Remember never to put passwords or tokens directly into this file, use encrypted credentials
-  # REDIS_URL: redis://x/y
-
-# Where your images will be hosted
-registry:
-  # Specify the registry server, if you're not using Docker Hub
-  # server: registry.digitalocean.com / ghcr.io / ...
-
-  # Set credentials with bin/rails credentials:edit
-  username: my-user
-  password: my-password-should-go-in-credentials

lib/tasks/mrsk/templates/mrsk

@@ -1,8 +0,0 @@
-#!/bin/bash
-
-if [ "${*}" == "" ]; then
-  # Improve so list matches
-  exec bin/rake -T mrsk
-else
-  exec bin/rake "mrsk:$@"
-fi

lib/tasks/mrsk/traefik.rake

@@ -1,41 +0,0 @@
-require_relative "setup"
-
-namespace :mrsk do
-  namespace :traefik do
-    desc "Run Traefik on servers"
-    task :run do
-      on(MRSK.config.role(:web).hosts) { execute *MRSK.traefik.run, raise_on_non_zero_exit: false }
-    end
-
-    desc "Start existing Traefik on servers"
-    task :start do
-      on(MRSK.config.role(:web).hosts) { execute *MRSK.traefik.start, raise_on_non_zero_exit: false }
-    end
-
-    desc "Stop Traefik on servers"
-    task :stop do
-      on(MRSK.config.role(:web).hosts) { execute *MRSK.traefik.stop, raise_on_non_zero_exit: false }
-    end
-
-    desc "Restart Traefik on servers"
-    task restart: %i[ stop start ]
-
-    desc "Display information about Traefik containers from servers"
-    task :info do
-      on(MRSK.config.role(:web).hosts) { |host| puts "Traefik Host: #{host}\n" + capture(*MRSK.traefik.info) + "\n\n" }
-    end
-
-    desc "Show last 100 log lines from Traefik on servers"
-    task :logs do
-      on(MRSK.config.hosts) { |host| puts "Traefik Host: #{host}\n" + capture(*MRSK.traefik.logs) + "\n\n" }
-    end
-
-    desc "Remove Traefik container and image from servers"
-    task remove: %i[ stop ] do
-      on(MRSK.config.role(:web).hosts) do
-        execute *MRSK.traefik.remove_container
-        execute *MRSK.traefik.remove_image
-      end
-    end
-  end
-end

mrsk.gemspec

@@ -6,11 +6,13 @@ Gem::Specification.new do |spec|
   spec.authors     = [ "David Heinemeier Hansson" ]
   spec.email       = "dhh@hey.com"
   spec.homepage    = "https://github.com/rails/mrsk"
-  spec.summary     = "Deploy Docker containers with zero downtime to any host."
+  spec.summary     = "Deploy Rails 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.add_dependency "railties", ">= 7.0.0"
+  spec.add_dependency "activesupport", ">= 7.0"
   spec.add_dependency "sshkit", "~> 1.21"
+  spec.add_dependency "thor", "~> 1.2"
 end