Are there any examples on the web of how to monitor delayed_job with Monit?
Everything I can find uses God, but I refuse to use God since long running processes in Ruby generally suck. (The most current post in the God mailing list? God Memory Usage Grows Steadily.)
Update: delayed_job now comes with a sample monit config based on this question.
Here is how I got this working.
script/delayed_job daemon you can use with monit. Railscasts has a good episode about this version of delayed_job (ASCIICasts version). This script also has some other nice features, like the ability to run multiple workers. I don't cover that here../configure --sysconfdir=/etc/monit so the standard Ubuntu configuration dir was picked up.Write a monit script. Here's what I came up with:
check process delayed_job with pidfile /var/www/app/shared/pids/delayed_job.pid
start program = "/var/www/app/current/script/delayed_job -e production start"
stop program = "/var/www/app/current/script/delayed_job -e production stop"
I store this in my soucre control system and point monit at it with include /var/www/app/current/config/monit in the /etc/monit/monitrc file.
monit start delayed_job and monit stop delayed_job is what you want to run. I also reload monit Thanks for the script.
One gotcha -- since monit by definition has a 'spartan path' of
/bin:/usr/bin:/sbin:/usr/sbin
... and for me ruby was installed / linked in /usr/local/bin, I had to thrash around for hours trying to figure out why monit was silently failing when trying to restart delayed_job (even with -v for monit verbose mode).
In the end I had to do this:
check process delayed_job with pidfile /var/www/app/shared/pids/delayed_job.pid
start program = "/usr/bin/env PATH=$PATH:/usr/local/bin /var/www/app/current/script/delayed_job -e production start"
stop program = "/usr/bin/env PATH=$PATH:/usr/local/bin /var/www/app/current/script/delayed_job -e production stop"