unicorn Cookbook

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

DEPRECATION NOTICE

This cookbook was originally coded prior to the adoption of bundler and rbenv/rvm. We don't believe that there's a need for installing unicorn into the system ruby in a modern ruby stack. We've chosen to deprecate the cookbook to prevent user confusion. We're open to rethinking this cookbook entirely and if that interests you drop us a line at [email protected]

Requirements

Platforms

• Any platform the supports the unicorn gem

Chef

• Chef 11+

Cookbooks

• none

Definitions

unicorn_config

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

Parameters:

• 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
• 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_worker_ready - 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:

• http://www.rubyenterpriseedition.com/faq.html#adapt_apps_for_cow
• https://newrelic.com/docs/ruby/ruby-gc-instrumentation

Respectively.

Examples:

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][:after_worker_ready] = '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]
  before_fork node[:unicorn][:after_worker_ready]
end

License & Authors

Author: Cookbook Engineering Team ([email protected])

Copyright: 2008-2015, 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

    http://www.apache.org/licenses/LICENSE-2.0

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.