Boot Hooks

Boot hooks are scripts which execute pre/post to events that occur in the boot script. Currently, that is pre/post_start, and pre/post_stop. These scripts are simply shell scripts which will be sourced into the boot script during execution.

Example Usage

Given a config like the following:

use Mix.Releases.Config

environment :default do
  set pre_start_hook: "rel/hooks/pre_start"
  set post_start_hook: "rel/hooks/post_start"
end

release :myapp do
  set version: current_version(:myapp)
end

And the two hook scripts under rel/hooks:

# pre_start
echo "we're starting!"

# post_start
echo "we've started!"

When you build your release, and run it, you’ll see something like the following:

> _build/dev/rel/myapp/bin/myapp foreground
we're starting!
...snip...
we've started!
...snip...

You have access to anything defined in the boot script’s environment, see Shell Script API for details.