god.conf

rails_root = "/home/insanity/iris"
rails_env = "production"

God.watch do |w|
  w.name = "unicorn"
  w.interval = 30.seconds # default

  # unicorn needs to be run from the rails root
  w.start = "cd #{rails_root} && /usr/local/bin/unicorn_rails -c #{rails_root}/config/unicorn.rb -E #{rails_env} -D"

  # QUIT gracefully shuts down workers
  w.stop = "kill -QUIT `cat #{rails_root}/tmp/pids/unicorn.pid`"

  # USR2 causes the master to re-create itself and spawn a new worker pool
  w.restart = "kill -USR2 `cat #{rails_root}/tmp/pids/unicorn.pid`"

  w.start_grace = 10.seconds
  w.restart_grace = 10.seconds
  w.pid_file = "#{rails_root}/tmp/pids/unicorn.pid"

  w.uid = 'root'
  w.gid = 'insanity'

  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 = 350.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

  # lifecycle
  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

2.times do |num|
  God.watch do |w|
    w.name     = "dj-#{num}"
    w.group    = 'dj'
    w.interval = 10.seconds
    w.dir = rails_root
    w.start = File.join(rails_root, "script/delayed_job start -i #{num}")
    w.stop = File.join(rails_root, "script/delayed_job stop -i #{num}")
    w.restart = File.join(rails_root, "script/delayed_job restart -i #{num}")
    w.start_grace = 10.seconds
    w.restart_grace = 10.seconds
    w.pid_file = File.join(rails_root, "tmp/pids/delayed_job.#{num}.pid")
    w.log = File.join(rails_root, 'log/delayed_job_god.log')

    w.uid = 'insanity'
    w.gid = 'insanity'

    # retart if memory gets too high
    w.transition(:up, :restart) do |on|
      on.condition(:memory_usage) do |c|
        c.above = 500.megabytes
        c.times = 2
      end
    end

    # 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
        c.interval = 5.seconds
      end

      # failsafe
      on.condition(:tries) do |c|
        c.times = 5
        c.transition = :start
        c.interval = 5.seconds
      end
    end

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