HomePage » Monitoring » MonitoringMonit
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 upcheck 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
