From: Colin Shield <colin_shield@...>
Date: 2008-07-10T03:01:46+09:00
Subject: Re: one background process

ara.t.howard wrote:
> On Jul 7, 2008, at 1:02 PM, Colin Shield wrote:
 if you want to run only one
> instance run it by hand via cron as the docs show 

Thanks for the reply. I've got it all working nicely in production now.
We use monit in production.
The config is under source control so we can deploy changes with cap.
I wrote some monit config to run a bj process. This may help somebody.

 ##### BJ ####
# BJ is a ruby script that manages background processes.
check process bj with pidfile /mnt/app/shared/pids/bj.pid
    start program = "/bin/bash /mnt/app/current/script/bj.sh start 
production &"
    stop program = "/bin/bash /mnt/app/current/script/bj.sh stop"

I wrote a bash wrapper (bj.sh) as monit uses pidfiles.

#!/bin/bash

case $1 in
start)
echo $$ > /mnt/app/shared/pids/bj.pid;
exec 2>&1 /usr/bin/ruby1.8 /mnt/app/current/script/bj run --forever 
--redirect=/mnt/app/shared/log/bj.log --rails_env=$2 
--rails_root=/mnt/app/current  1>/mnt/app/shared/log/bj.log
;;
stop)
kill `cat /mnt/app/shared/pids/bj.pid`; rm  /mnt/app/shared/pids/bj.pid 
;;
*)
echo "usage: bj.sh {start <stage>|stop}" ;;
esac
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