Nginx God Config

god_nginx.rb

God.watch do |w|
  w.name = "nginx"
  w.interval = 60.seconds
  w.start = "/usr/local/nginx/sbin/nginx"
  w.stop = "/usr/local/nginx/sbin/nginx -s stop"
  w.start_grace = 10.seconds
  w.restart_grace = 10.seconds

  # determine the state on startup
  w.transition(:init, { true => :up, false => :start}) do |on|
    on.condition(:process_running) do |c|
      c.running = true
    end
  end

  # determine when process has finished starting
  w.transition([:start, :restart], :up) do |on|
    on.condition(:process_running) do |c|
      c.running = true
    end

    # failsafe
    on.condition(:tries) do |c|
      c.times = 8
      c.within = 2.minutes
      c.transition = :start
    end
  end

  # start if process is not running
  w.transition(:up, :start) do |on|
    on.condition(:process_exits)
  end

  # restart if no responce on localhost
  w.transition(:up, :restart) do |on|
    on.condition(:http_response_code) do |c|
      c.host = 'localhost'
      c.port = port
      c.path = '/'
      c.code_is = 500
      c.timeout = 30.seconds
      c.times = [3, 5]
    end
  end

  # lifecycle
  w.lifecycle do |on|
    on.condition(:flapping) do |c|
      c.to_state = [:start, :restart]
      c.times = 4
      c.within = 5.minutes
      c.transition = :unmonitored
      c.retry_in = 10.minutes
      c.retry_times = 5
      c.retry_within = 2.hours
    end
  end
end