God DJ watch config

dj_watch.rb

DJ_WORKERS_NUM = 1

DJ_WORKERS_NUM.times do |num|
  God.watch do |w|
    script = File.join(RAILS_ROOT, "script/delayed_job -i #{num}")

    w.name     = "dj-#{num}"
    w.group    = 'dj'
    w.interval = 30.seconds
    w.start    = "#{script} start"
    w.stop     = "#{script} stop"
    w.restart  = "#{script} restart"
    w.dir      = RAILS_ROOT
    w.pid_file = File.join(RAILS_ROOT, "tmp/pids/delayed_job.#{num}.pid")

    w.start_grace = 10.seconds
    w.restart_grace = 10.seconds

    w.uid = 'app'

    w.behavior(:clean_pid_file)

    w.start_if do |start|
      start.condition(:process_running) do |c|
        c.interval = 5.seconds
        c.running = false
      end
    end

    w.restart_if do |restart|
      restart.condition(:memory_usage) do |c|
        c.above = 500.megabytes
        c.times = [3, 5] # 3 out of 5 intervals
      end

      restart.condition(:cpu_usage) do |c|
        c.above = 50.percent
        c.times = 5
      end
    end

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

  end
end