How do I create a watch for a process that doesn't write it's own pid, and God isn't locating the correct pid automatically.

[donnoman]

I'm trying to get God to watch Riak on Ubuntu.

The riak init script doesn't write pids, and su's as the riak user and uses 'pings' to determine if it's up or down as opposed to tracking pids.

When trying to start the init scripts via god, it detects the wrong pid. (or rather the pid that spawns the process goes away)

root@lucid32:/etc/god# god status

riak: start

root@lucid32:/etc/god# cat /var/run/god/riak.pid     

16382

root@lucid32:/etc/god# ps aux | grep 16382        

root     16906  0.0  0.1   2140   744 pts/0    S+   00:16   0:00 grep --color=auto 16382

but riak is running happily

root@lucid32:/etc/god# ps aux | grep riak

riak     16421  0.0  0.2   2192   760 ?        S    00:08   0:00 /usr/lib/riak/erts-5.7.5/bin/run_erl -daemon /tmp/riak// /var/log/riak exec /usr/sbin/riak console

riak     16422  0.2  3.9  25456 14856 pts/1    Ssl+ 00:08   0:01 /usr/lib/riak/erts-5.7.5/bin/beam -K true -A 64 -- -root /usr/lib/riak -progname riak -- -home /var/lib/riak -- -boot /usr/lib/riak/releases/0.14.2/riak -embedded -config /etc/riak/app.config -name ri...@127.0.0.1 -setcookie riak -- console

riak     16447  0.0  0.1   1956   384 ?        S    00:08   0:00 /usr/lib/riak/erts-5.7.5/bin/epmd -daemon

riak     16509  0.0  0.1   1832   532 ?        Ss   00:08   0:00 sh -s disksup

riak     16511  0.0  0.1   1752   496 ?        Ss   00:08   0:00 /usr/lib/riak/lib/os_mon-2.2.5/priv/bin/memsup

riak     16512  0.0  0.0   1748   360 ?        Ss   00:08   0:00 /usr/lib/riak/lib/os_mon-2.2.5/priv/bin/cpu_sup

root     16848  0.0  0.1   2076   632 pts/2    S+   00:11   0:00 tail -f /var/log/god.log /var/log/riak/god.log

root     16912  0.0  0.2   2144   808 pts/0    S+   00:17   0:00 grep --color=auto riak

root@lucid32:/etc/god# /etc/init.d/riak ping

Attempting to restart script through sudo -u riak

pong

The current god config.

God.watch do |w|

  w.name = 'riak'

  w.interval = 5.seconds

  daemon = '/etc/init.d/riak'

  

  w.start   = "#{daemon} start"

  w.stop    = "#{daemon} stop"

  w.restart = "#{daemon} restart"

  w.start_grace = 60.seconds

  w.stop_grace = 60.seconds

  w.restart_grace = 60.seconds

  

  w.log = "/var/log/riak/god.log"

  w.transition(:init, { true => :up, false => :start }) do |on|

    on.condition(:process_running){|c| c.running = true }

  end

  w.transition([:start, :restart], :up) do |on|

    on.condition(:process_running){|c| c.running = true }

  end

  # start if process is not running

  w.transition(:up, :start) do |on|

    on.condition(:process_exits) do |c|

      c.notify = %w[ localhost ]

    end

  end

  w.transition(:up, :unmonitored) do |on|

    on.condition(:flapping){|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

      c.notify = %w[ localhost ]

    }

  end

end

How do I override the test for process_running to use the pings instead of checking for the pids?