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.


  • 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


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

Example Unicorn config examples/unicorn.rb

  • :unicorn_pid

    Default assumes your pid file will be located in CURRENT_PATH/tmp/pids/ The unicorn_pid should be defined with an absolute path.

  • :unicorn_config_path

    Default assumes that your Unicorn configuration will be located in CURRENT_PATH/config/unicorn/RAILS_ENV.rb

  • :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.

  • :unicorn_bundle_gemfile

    REMOVED in v0.2.0

    Set the BUNDLE_GEMFILE in a before_exec block in your unicorn.rb. See sandbox and unicorn-restart-issue-with-capistrano

  • :unicorn_restart_sleep_time

    In unicorn:legacy_restart send the USR2 signal, sleep for this many seconds (defaults to 3), then send the QUIT signal


Add the library to your Gemfile:

group :development do
  gem 'capistrano3-unicorn'

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'

If preload_app:true and you need capistrano to cleanup your oldbin pid use:

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

Otherwise use:

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

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.