Capistrano3 Unicorn

This is a capistrano v3 plugin that integrates Unicorn tasks into capistrano deployment scripts; it was heavily inspired by sosedoff/capistrano-unicorn but written from scratch to use the capistrano 3 syntax.

Gotchas

• The unicorn:start task invokes unicorn as bundle exec unicorn.

• When running tasks not during a full deployment, you may need to run the rvm:hook:

  cap production rvm:hook unicorn:start

Conventions

You can override the defaults by set :unicorn_example, value in the config/deploy.rb or config/deploy/ENVIRONMENT.rb capistrano deployment files

• :unicorn_pid

  Assumes your pid file will be located in the application's shared path .../shared/pids/unicorn.pid so that it survives zero-downtime re-deployments

• :unicorn_config_path

  Assumes that your Unicorn configuration will be located in config/unicorn/RAILS_ENV.rb

• :unicorn_restart_sleep_time

  When performing zero-downtime deployment via the unicorn:restart task, send the USR2 signal, sleep for this many seconds (defaults to 3), then send the QUIT signal

• :unicorn_roles

  Roles to run unicorn commands on. Defaults to :app

• :unicorn_options

  Set any additional options to be passed to unicorn on startup. Defaults to none

• :unicorn_rack_env

  Set the RACK_ENV. Defaults to deployment unless the RAILS_ENV is development. Valid options are "development", "deployment", or "none". See the RACK ENVIRONMENT section of the unicorn documentation for more information.

Setup

Add the library to your Gemfile:

group :development do
  gem 'capistrano3-unicorn'
end

Add the library to your Capfile:

require 'capistrano3/unicorn'

Invoke Unicorn from your config/deploy.rb or config/deploy/ENVIRONMENT.rb:

If preload_app:true use:

after 'deploy:publishing', 'deploy:restart'
namespace :deploy do
  task :restart do
    invoke 'unicorn:restart'
  end
end

Otherwise use:

after 'deploy:publishing', 'deploy:restart'
namespace :deploy do
  task :restart do
    invoke 'unicorn:reload'
  end
end

Note that presently you must put the invoke outside any on block since the task handles this for you; otherwise you will get an undefined method 'verbosity' error.

Note that the after hook is needed from Capistrano 3.1 forward.