puma config for rails

puma.rb

rails_env = ENV['RAILS_ENV'] || 'development'
rails_root = File.expand_path("../", File.dirname(__FILE__))

# threads
threads 0,1

# workers
case rails_env
  when 'staging'
    workers 1
  when 'production'
    workers 2
  else
    workers 0
end

# bind
if ['staging', 'production'].include?(rails_env)
  bind  'unix://' + File.join(rails_root, "tmp/sockets/puma.sock")
else
  bind 'tcp://0.0.0.0:3000'
end

pidfile File.join(rails_root, "tmp/pids/puma.pid")
state_path File.join(rails_root, "tmp/sockets/puma.state")

activate_control_app