Add two new hooks pre-app-boot and post-app-boot. They are analagous
to the pre/post proxy reboot hooks.
If the boot strategy deploys in groups, then the hooks are called once
per group of hosts and `KAMAL_HOSTS` contains a comma delimited list of
the hosts in that group.
If all hosts are deployed to at once, then they are called once with
`KAMAL_HOSTS` containing all the hosts.
It is possible to have pauses between groups of hosts in the boot config,
where this is the case the pause happens after the post-app-boot hook is
called.
which will build a "dirty" image using the working directory.
This command is different from `build push` in two important ways:
- the image tags will have a suffix of `-dirty`
- the export action is "docker", pushing to the local docker image store
The command also supports the `--output` option just added to `build
push` to override that default.
This command is intended to allow developers to quickly iterate on a
docker image built from their local working directory while avoiding
any confusion with a pristine image built from a git clone, and
keeping those images on the local dev system by default.
which controls where the build result is exported.
The default value is "registry" to reflect the current behavior of
`build push`.
Any value provided to this option will be passed to the `buildx build`
command as a `--output=type=<VALUE>` flag.
For example, the following command will push to the local docker image
store:
kamal build push --output=docker
squash
We were checking before `kamal build push`, but not `kamal registry login`.
Since `kamal registry login` is called first by a deploy we don't
get the nice error message.
We only loaded the configuration once, which meant that aliases always
used the initial configuration file and destination.
We don't want to load the configuration in subcommands as it is not
passed all the options we need. But just checking if we are in a
subcommand is enough - the alias reloads and the subcommand does not.
One thing to note is that anything passed on the command line overrides
what is in the alias, so if an alias says
`other_config: config -c config/deploy2.yml` and you run
`kamal other_config -c config/deploy.yml`, it won't switch.
this is useful for long running rake tasks or scripts
that can be run without having to keep open connection to the server.
Example:
```
kamal app exec 'bin/rails db:backfill_task' --detach
```
The max-size log opt is not valid for all logging drivers, such as
syslog. Allow the option to be removed from the boot config with:
```
kamal proxy boot_config set --log-max-size=
or
kamal proxy boot_config set --log-max-size=""
```
Dotenv's variable substitution doesn't work the same way as commands run
in the shell. It needs values to be escaped.
```sh
$ cat /tmp/env
SECRETS=$(cat /tmp/json)
SECRETS2=$(echo $SECRETS | jq)
$ cat /tmp/json
\{\ \"foo\"\ :\ \"bar\" \}
$ SECRETS=$(cat /tmp/json)
$ SECRETS2=$(echo $SECRETS | jq)
jq: parse error: Invalid numeric literal at line 1, column 2
$ ruby -e 'require "dotenv"; puts Dotenv.parse("/tmp/env")["SECRETS2"]'
{
"foo": "bar"
}
```
Since you then can't use the shell to debug, `kamal secrets print` will
allow you to see what the secrets will be set to.
Add commands for managing proxy boot config. Since the proxy can be
shared by multiple applications, the configuration doesn't belong in
`config/deploy.yml`.
Instead you can set the config with:
```
Usage:
kamal proxy boot_config <set|get|clear>
Options:
[--publish], [--no-publish], [--skip-publish] # Publish the proxy ports on the host
# Default: true
[--http-port=N] # HTTP port to publish on the host
# Default: 80
[--https-port=N] # HTTPS port to publish on the host
# Default: 443
[--docker-options=option=value option2=value2] # Docker options to pass to the proxy container
```
By default we boot the proxy with `--publish 80:80 --publish 443:443`.
You can stop it from publishing ports, specify different ports and pass
other docker options.
The config is stored in `.kamal/proxy/options` as arguments to be passed
verbatim to docker run.
Where someone wants to set the options in their application they can do
that by calling `kamal proxy boot_config set` in a pre-deploy hook.
There's an example in the integration tests showing how to use this to
front kamal-proxy with Traefik, using an accessory.
1. Update to kamal-proxy 0.4.0 which creates and chowns
/home/kamal-proxy/.config/kamal-proxy to kamal-proxy
2. Use a docker volume rather than mapping in a directory, so docker
keeps it owned by the correct user
By default only the primary role runs the proxy. To disable the proxy
for that role, you can set `proxy: false` under it.
For other roles they default to not running the proxy, but you can
enable it by setting `proxy: true` for the role, or alternatively
setting a proxy configuration.
The proxy configuration will be merged into the root proxy configuration.
Remove `stop_wait_time` and `readiness_timeout` from the root config
and remove `deploy_timeout` and `drain_timeout` from the proxy config.
Instead we'll just have `deploy_timeout` and `drain_timeout` in the
root config.
For roles that run the proxy, they are passed to the kamal-proxy deploy
command. Once that returns we can assume the container is ready to
shut down.
For other roles, we'll use the `deploy_timeout` when polling the
container to see if it is ready and the `drain_timeout` when stopping
the container.
Adds:
- `kamal upgrade` to upgrade all app hosts and accessory hosts
- `kamal proxy upgrade` to upgrade the proxy on all hosts
- `kamal accessory upgrade [name]` to upgrade accessories on all hosts
Upgrade takes rolling and confirmed options and calls `proxy upgrade`
and `accessory upgrade` in turn.
To just upgrade a single host add -h [host] to the command. But the
upgrade should run on all hosts, not just those running the proxy.
Calling upgrade on a host that has already been upgraded should work ok.
Upgrading hosts causes downtime but you can avoid if you run multiple
hosts by:
1. Implementing the pre-proxy-reboot and post-proxy-reboot hooks to
remove the host from external load balancers
2. Running the upgrade with the --rolling option
**kamal proxy upgrade**
1. Creates a `kamal` network if required
2. Stops and removes the old proxy (whether Traefik or kamal-proxy)
3. Starts a kamal-proxy container in the `kamal` network
4. Reboots the app containers in the `kamal` network
**kamal accessory upgrade [name]**
1. Creates a `kamal` network if required
2. Reboots the accessory containers in the `kamal` network
A matching `downgrade` command will be added to Kamal 1.9.
