Skip to content


Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Development repository for Opscode Cookbook unicorn
branch: master


Installs and configures unicorn, and provides a definition to manage configuration file for Rack apps running under unicorn.


Should work anywhere.



The unicorn_config definition manages the configuration template for an application running under unicorn.


  • listen - Default is nil.
  • working_directory - Default is nil.
  • worker_timeout - Default is 60.
  • preload_app - Default is false.
  • worker_processes - Number of worker processes to spawn. Default is 4.
  • unicorn_command_line - If set, specifies the unicorn commandline to set in the config file. Usefull when sandboxing your unicorn installation.
  • forked_user - User to run children as. Default is nil.
  • forked_group - Group to run children as. You must specify a forked_user as well to use this attribute. Default is nil.
  • before_exec - Default is nil.
  • before_fork - Default is nil.
  • after_fork - Default is nil.
  • pid - Pidfile location. Default is nil.
  • stderr_path - Where stderr gets logged. Default is nil.
  • stdout_path - Where stdout gets logged. Default is nil.
  • notifies - How to notify another service if specified. Default is nil.
  • owner - Owner of the template. Default is nil.
  • group - group of the template. Default is nil.
  • mode - mode of the template. Default is nil.
  • unicorn_command_line - Specify the command-line for the unicorn binary as a string. Populates Unicorn::HttpServer::START_CTX[0]. Default is nil.
  • copy_on_write - Whether the app should take advantage of REE Copy On Write feature. Default is false.
  • enable_stats - Whether the app should have GC profiling enabled for instrumentation. Default is false.

For more information on copy_on_write and enable_stats, see:



Setting some custom attributes in a recipe (this is from Chef's application::unicorn.

node.default[:unicorn][:worker_timeout] = 60
node.default[:unicorn][:preload_app] = false
node.default[:unicorn][:worker_processes] = [node[:cpu][:total].to_i * 4, 8].min
node.default[:unicorn][:preload_app] = false
node.default[:unicorn][:before_fork] = 'sleep 1'
node.default[:unicorn][:port] = '8080'
node.set[:unicorn][:options] = { :tcp_nodelay => true, :backlog => 100 }

unicorn_config "/etc/unicorn/#{app['id']}.rb" do
  listen({ node[:unicorn][:port] => node[:unicorn][:options] })
  working_directory ::File.join(app['deploy_to'], 'current')
  worker_timeout node[:unicorn][:worker_timeout]
  preload_app node[:unicorn][:preload_app]
  worker_processes node[:unicorn][:worker_processes]
  before_fork node[:unicorn][:before_fork]

License and Author

  • Author: Adam Jacob

  • Copyright 2009-2013, Chef Software, Inc.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Something went wrong with that request. Please try again.