Install Monit on Debian

Monit is a handy program that monitors and manages server programs to make sure that are running and start them if they are not.

To install and configure monit you will need to ssh into your server, once in check to make sure the monit package is available

aptitude search monit

in the list you should see monit with a description

p   monit       - utility for monitoring and managing daemons or similar programs

Next to install monit run

aptitude install monit

you can then check and modify the config

vi /etc/monit/monitrc

To add custom monitors add a config file to /etc/monit/conf.d/

as an example that will stat apache if it stops edit or create /etc/monit/conf.d/apache and add a basic config

check process apache with pidfile /run/apache2.pid
start program = "/etc/init.d/apache2 start" with timeout 60 seconds
stop program  = "/etc/init.d/apache2 stop"

mysql example

check process mysqld with pidfile /var/run/mysqld/mysqld.pid
start program = "/etc/init.d/mysql start"
stop program = "/etc/init.d/mysql stop"

After you have created your config files check that there are no syntax error

/etc/init.d/monit syntax 

or

monit -t

then reload or restart the monit service

/etc/init.d/monit reload

Job done