example generic unicorn.rb

gistfile1.txt

# config/unicorn.rb
worker_processes 4
working_directory "/home/deploy/rails_apps/$app/current"

listen "/tmp/unicorn.sock", :backlog => 64
timeout 30

pid "/home/deploy/rails_apps/$app/shared/pids/unicorn.pid"
stderr_path "/home/deploy/rails_apps/$app/shared/log/unicorn.stderr.log"
stdout_path "/home/deploy/rails_apps/$app/shared/log/unicorn.stdout.log"

# combine Ruby 2.0.0dev or REE with "preload_app true" for memory savings
# http://rubyenterpriseedition.com/faq.html#adapt_apps_for_cow
GC.respond_to?(:copy_on_write_friendly=) and
  GC.copy_on_write_friendly = true

before_fork do |server, worker|
  # the following is highly recomended for Rails + "preload_app true"
  # as there's no need for the master process to hold a connection
  defined?(ActiveRecord::Base) and
    ActiveRecord::Base.connection.disconnect!
  old_pid = "#{server.config[:pid]}.oldbin"
  # kill off the old master
  if File.exists?(old_pid) && server.pid != old_pid
    begin
      Process.kill("QUIT", File.read(old_pid).to_i)
    rescue Errno::ENOENT, Errno::ESRCH
      # someone else did our job for us
    end
  end
end

after_fork do |server, worker|
  # the following is *required* for Rails + "preload_app true",
  defined?(ActiveRecord::Base) and
    ActiveRecord::Base.establish_connection
end