Install monit:
sudo apt-get install monit
Edit the /etc/default/monit file and enable the start up flag, which ensures that the configuration is done so that monit can start.
# vim /etc/default/monit startup=1
Configure monit:
sudo vim /etc/monit/monitrc
Set Monit to check services every two minutes (120 seconds), and log to /var/log/daemon.log
set daemon 120 set logfile syslog facility log_daemon
Setup email alerts:
set mailserver localhost
set mail-format { from: monit@myserver.domain.com }
set alert sysadmin@domain.com
Switch on the HTTP interface, allow access from anywhere, and require a username and password. Make it a decent password, because the HTTP interface allows you to stop and start services.
set httpd port 2812
use address myserver.domain.com
allow 0.0.0.0/0.0.0.0
allow myusername:mypassword
/etc/init.d/delayed_job:
#! /bin/sh
set_path="cd /var/www/app"
case "$1" in
start)
echo -n "Starting delayed_job: "
su - root -c "$set_path; RAILS_ENV=production script/delayed_job start" >> /var/log/delayed_job.log 2>&1
echo "done."
;;
stop)
echo -n "Stopping delayed_job: "
su - root -c "$set_path; RAILS_ENV=production script/delayed_job stop" >> /var/log/delayed_job.log 2>&1
echo "done."
;;
*)
echo "Usage: $N {start|stop}" >&2
exit 1
;;
esac
exit 0
sudo chmod +x /etc/init.d/delayed_job
monit delayed_job configuration:
check process delayed_job with pidfile /var/www/app/tmp/pids/delayed_job.pid
stop program = "/etc/init.d/delayed_job stop"
start program = "/etc/init.d/delayed_job start"
if totalmem > 100.0 MB for 3 cycles then restart
if cpu usage > 95% for 3 cycles then restart
Start monit, and query it. You need the HTTP interface to use the ‘status’ command.
sudo /etc/init.d/monit start sudo monit status
Suppose you have 2 workers, you’ll monitor all of them with the following:
check process delayed_job.0 with pidfile /path/to/shared/pids/delayed_job.0.pid start program = "/bin/su -c '/usr/bin/env RAILS_ENV=production /path/to/current/script/delayed_job -n 5 start' - user" stop program = "/bin/su -c '/usr/bin/env RAILS_ENV=production /path/to/current/script/delayed_job stop' - user" check process delayed_job.1 with pidfile /path/to/shared/pids/delayed_job.1.pid start program = "/bin/su -c '/usr/bin/env RAILS_ENV=production /path/to/current/script/delayed_job -n 5 start' - user" stop program = "/bin/su -c '/usr/bin/env RAILS_ENV=production /path/to/current/script/delayed_job stop' - user"
http://www.darkcoding.net/software/setting-up-monit-on-ubuntu/
http://www.thegeekstuff.com/2010/11/monit-install-config/
http://www.funonrails.com/2011/03/monitor-delayedjob-in-rails.html
http://stackoverflow.com/questions/6071970/monitoring-multiple-delayed-job-workers-with-monit