KfWiki: Monitoring with monit

Monitoring with monit

Getting and installing monit

Get it from http://tildeslash.com/monit/download/
Do a typical source install, then move forward to the next section

Configuring monit to start in inittab

First, create a monitrc file in /etc/monitrc. The following rc file monitors apache.

 set daemon 120 # Poll at 2-minute intervals
 set logfile syslog facility log_daemon
 set alert root@localhost
 set httpd port 2812 and use address localhost
	 allow localhost   # Allow localhost to connect
	 allow admin:monit # Allow Basic Auth

 check process apache with pidfile /var/run/httpd.pid
   group www
   start program = "/etc/init.d/httpd start"
   stop  program = "/etc/init.d/httpd stop"
   if failed host 127.0.0.1 port 80 
		protocol HTTP request / then restart
   if totalmem > 90% for 2 cycles then restart
   if loadavg(5min) > 20 for 2 cycles then restart
   if 5 restarts within 5 cycles then timeout
   depends on apache_bin
   depends on apache_rc

 check file apache_bin with path /usr/sbin/httpd
   group www
   if failed checksum then unmonitor
   if failed permission 755 then unmonitor
   if failed uid root then unmonitor
   if failed gid root then unmonitor

 check file apache_rc with path /etc/init.d/httpd
   group www
   if failed checksum then unmonitor
   if failed permission 755 then unmonitor
   if failed uid root then unmonitor
   if failed gid root then unmonitor

chmod 600 /etc/monitrc, then add the following to inittab:

# Run monit in standard run-levels
mo:2345:respawn:/usr/local/bin/monit -Ic /etc/monitrc

Restart the linux init process

kill -HUP 1

Restart apache with monit

This could be useful if apache (or most likely crappy php code) is not cleaning up

 check process apache 
	with pidfile "/usr/local/apache/logs/httpd.pid"
	start program = "/etc/init.d/httpd start" with timeout 60 seconds
	stop program = "/etc/init.d/httpd stop"
	if 2 restarts within 3 cycles then timeout
	if totalmem > 100 Mb then alert
	if children > 255 for 5 cycles then stop
	if cpu usage > 95% for 3 cycles then restart
	if failed port 80 protocol http then restart
	group server
	depends on httpd.conf, httpd.bin

Note

Sometimes monit acts weird, like when it starts it doesn't start up all services. Or it starts and certain service are started in not monitored state. I haven't figured out that yet but running monit validate all and monit monitor all seems to be helpful in those situations.

Ref: http://mmonit.com/monit/documentation/monit.html#examples

KfWiki : MonitoringMonit

Monitoring with monit

Getting and installing monit

Configuring monit to start in inittab

Restart apache with monit

Note