Basic unicorn configuration for Rails

unicorn.rb

# -*- encoding: utf-8 -*-

# config/server/unicorn.rb
require 'fileutils'

# required data
env = ENV['RACK_ENV']

app_dir = File.expand_path('../../..', __FILE__)
app_key = 'app'

pids_file = "unicorn.pid"
pids_dir  = "#{app_dir}/tmp/pids"
::FileUtils.mkdir_p "#{pids_dir}"

log_file = "unicorn_#{env}.log"
log_dir  = "#{app_dir}/log"
::FileUtils.mkdir_p "#{log_dir}"

# unicorn configuration
working_directory app_dir
pid "#{pids_dir}/#{pids_file}"
stderr_path "#{log_dir}/#{log_file}"
stdout_path "#{log_dir}/#{log_file}"

if env == 'production'
  listen "/tmp/unicorn.#{app_key}.sock"
  worker_processes 2
  timeout 30
else
  listen '127.0.0.1:3000'
  worker_processes 1
  timeout 240
end