Monit

How to install M/Monit from sources

• Download Monit tar file from tildeslash

wget http://www.tildeslash.com/monit/dist/monit-4.10.1.tar.gz

• Unpack and install

tar zxvf monit-4.10.1.tar.gz
cd monit-4.10.1
./configure
make
make install

How to setup M/Monit

• Open /etc/monit.conf and set/uncomment this values:
  • Run Monit as daemon

set daemon 120

• Send logs to /var/log/messages

set logfile syslog facility log_daemon

• Setup Monit Web Service with authentication from anywhere

set httpd port 2812 and
allow user:password

• Read configuration files for each service

include /etc/monit.d/*

• Open /etc/httpd/conf/httpd.conf and add the following lines:

# Avoid Monit activity to be logged on Apache log
SetEnvIf Request_URI "^/monit/token$" dontlog
CustomLog logs/access_log common env=!dontlog

• Open port on iptables to watch monit on TCP port 2812

iptables -A INPUT -p tcp --dport 2812 -j ACCEPT

How to configure M/Monit services

Apache

File: /etc/monit.d/httpd.conf

check process httpd with pidfile /var/run/httpd.pid
  group apache
  start program = "/sbin/service httpd start"
  stop program = "/sbin/service httpd stop"
  if failed port host 127.0.0.1 port 80 protocol http
    and request "/api/restaurant/id"
  then restart
  if 5 restarts within 5 cycles then timeout

MySQL

File: /etc/monit.d/mysqld.conf

check process mysql with pidfile /var/run/mysqld/mysqld.pid
  group mysql
  start program = "/sbin/service mysqld start"
  stop program = "/sbin/service mysqld stop"
  if failed host 127.0.0.1 port 3306 protocol mysql
    then restart
  if 5 restarts within 5 cycles then timeout

Actionqueue

File: /etc/monit.d/actionqueue.conf

check process actionqueue with pidfile /var/run/actionqueue.pid
  group root
  start program = "/sbin/service actionqueue start"
  stop program = "/sbin/service actionqueue stop"
  if failed host 127.0.0.1 port 8443
    then restart
  if 5 restarts within 5 cycles then timeout

How to setup and start M/Monit service

Boot from init.d

• Register the service to start on boot

chkconfig monit on

• Start service

service monit start

Respawnning with inittab

• Append /etc/inittab to add:

mo:2345:respawn:/usr/bin/monit -Ic /etc/monit.conf

• Start monit

init q