https://groups.google.com/forum/#!topic/daemon-kit/NE-tJO7WD3A

api_server.rb

# lib/api_server
class ApiServer
  def call(env)
    [200, {"Content-Type" => "text/html"}, "Hello World"]
  end
end

Gemfile

# ... truncated

gem 'thin'

rackmq-daemon.rb

# libexec/rackmq-daemon.rb

# Generated amqp daemon
require 'api_server'

server = Thin::Server.new 4567 do
  run ApiServer.new
end

# Do your post daemonization configuration here
# At minimum you need just the first line (without the block), or a lot
# of strange things might start happening...
DaemonKit::Application.running! do |config|
  # Trap signals with blocks or procs
  # config.trap( 'INT' ) do
  #   # do something clever
  # end
  # config.trap( 'TERM', Proc.new { puts 'Going down' } )

  config.at_shutdown { server.stop! }
end

# IMPORTANT CONFIGURATION NOTE
#
# Please review and update 'config/amqp.yml' accordingly or this
# daemon won't work as advertised.

# Run an event-loop for processing
DaemonKit::AMQP.run do |connection|
  # Inside this block we're running inside the reactor setup by the
  # amqp gem. Any code in the examples (from the gem) would work just
  # fine here.

  # Uncomment this for connection keep-alive
  # connection.on_tcp_connection_loss do |client, settings|
  #   DaemonKit.logger.debug("AMQP connection status changed: #{status}")
  #   client.reconnect(false, 1)
  # end

  server.start

  amq = AMQP::Channel.new
  queue = amq.queue('test')
  queue.subscribe do |msg|
    DaemonKit.logger.debug "Received message: #{msg.inspect}"
  end

  EM.add_periodic_timer(5) {
    queue.publish "TICK..."
  }
end