help me setup monit please :)

steve51184 · 08-01-2009, 01:00 PM

right i'm using monit to monitor mysql, apache, and ssd here my config:

Quote:

set daemon 60
set logfile syslog facility log_daemon
set mailserver server.ip
set mail-format { from: monit@server1.domain.com }
set alert email
set httpd port 2812 and
allow admin

assword

check process sshd with pidfile /var/run/sshd.pid
start program "/etc/init.d/ssh start"
stop program "/etc/init.d/ssh stop"
if failed port 22 protocol ssh then restart
if 5 restarts within 5 cycles then timeout

check process mysql with pidfile /var/run/mysqld/mysqld.pid
group database
start program = "/etc/init.d/mysql start"
stop program = "/etc/init.d/mysql stop"
if failed host H045 port 3306 then restart
if 5 restarts within 5 cycles then timeout

check process apache with pidfile /var/run/apache2.pid
group www
start program = "/etc/init.d/apache2 start"
stop program = "/etc/init.d/apache2 stop"
if failed host www.thereddwarf.com port 80 protocol http
and request "/monit/token" then restart
if cpu is greater than 60% for 2 cycles then alert
if cpu > 80% for 5 cycles then restart
if totalmem > 500 MB for 5 cycles then restart
if children > 250 then restart
if loadavg(5min) greater than 10 for 8 cycles then stop
if 3 restarts within 5 cycles then timeout

i have a few questions:

1. is the config right?

2. is this just to monitor if these 3 services are down? (ie nothing else but to check if there down and to restart if they are)

3. is there a way to have it restart the services is they use a lot of cpu/ram

i'm really interested in question 3 as apache and sometime mysql uses a lot of ram like 1gb+ (but i do have 4gb)

jahic.mersudin · 08-03-2009, 03:27 AM

if have no idea what u are doing try using webmin that has simple web interface and check config from there

zhjim · 08-03-2009, 03:43 AM

Quote:

Originally Posted by steve51184

1. is the config right?

Dunno but I'll guess if monit starts everything is fine. Else try the -I option to monit. It just lingers aroud in the foreground and you might see what it does does not do.

Quote:

Originally Posted by steve51184

2. is this just to monitor if these 3 services are down? (ie nothing else but to check if there down and to restart if they are)

Dunno but as you only have three check process lines inside your config I incline to it.

Quote:

Originally Posted by steve51184

3. is there a way to have it restart the services is they use a lot of cpu/ram

Take a look here. this is an example for restarting apache in certain circumstances. Should give you an idea how to setup things for mysql and ssh as well.

http://mmonit.com/wiki/Monit/MonitorApacheStatus

Just a hint. I'd be carefull with restarting (stopping) ssh automaticly. Might lead to lockdown of box cause the sshd does not come up for some reason.