How To Install Monit on CentOS 7 / Debian 11

What is Monit?

Monit is a free, open-source process supervision tool for Unix and Linux. With Monit, system status can be viewed directly from the command line, or via the native HTTP web server. Monit is able to do automatic maintenance, repair, and run meaningful causal actions in error situations.

How To Install Monit on CentOS 7 / Debian 11

##For CentOS 7 

yum install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm

yum -y install monit

##

##For Debian 11

apt-get update

apt-get -y install monit

cp /etc/monit/monitrc /etc/monit/monitrc_bkp

nano /etc/monit/monitrc

##Copy paste##

####Copy from here#####

###############################################################################

## Monit control file

###############################################################################

##

## Comments begin with a '#' and extend through the end of the line. Keywords

## are case insensitive. All path's MUST BE FULLY QUALIFIED, starting with '/'.

##

## Below you will find examples of some frequently used statements. For

## information about the control file and a complete list of statements and

## options, please have a look in the Monit manual.

##

##

###############################################################################

## Global section

###############################################################################

set daemon 120            # check services at 2-minute intervals

set logfile /var/log/monit.log

set idfile /var/lib/monit/id

set statefile /var/lib/monit/state

set mailserver localhost               # primary mailserver

set eventqueue

basedir /var/lib/monit/events # set the base directory where events will be stored

slots 100                     # optionally limit the queue size

set mail-format {

   subject: monit alert on {your servername or IP}  --  $EVENT $SERVICE

 }

set alert icallify.logs@gmail.com

include /etc/monit/conf.d/*

include /etc/monit/conf-enabled/*

## Chekck mariadb service running status

check process mysqld with pidfile /var/run/mysqld/mysql.pid

start program = "/bin/systemctl start mariadb"

stop program = "/bin/systemctl stop mariadb"

if failed host 127.0.0.1 port 3306 then restart

if 5 restarts within 5 cycles then timeout

## Check fail2ban service running status

check process fail2ban with pidfile /var/run/fail2ban/fail2ban.pid 

start program = "/bin/systemctl start fail2ban"

stop program = "/bin/systemctl stop fail2ban"

## Check asterisk service running status

check process asterisk with pidfile /var/run/asterisk/asterisk.pid  

start program = "/bin/systemctl start asterisk"

stop program  = "/bin/systemctl stop asterisk"

## Check apache service running service status

check process apache2 with pidfile /var/run/apache2/apache2.pid      

start program = "/bin/systemctl start apache2" with timeout 30 seconds

stop program  = "/bin/systemctl stop apache2"

## Check overall system performance

check system localhost

if loadavg (5min) > 8 for 4 cycles then alert

if loadavg (15min) > 8 for 4 cycles then alert

if memory usage > 80% for 4 cycles then alert

if swap usage > 20% for 4 cycles then alert

if cpu usage (user) > 80% for 4 cycles then alert

if cpu usage (system) > 20% for 4 cycles then alert

if cpu usage (wait) > 20% for 4 cycles then alert

check filesystem "root" with path /

if space usage > 80% for 1 cycles then alert

######EOF##########

#Logrotaion configuration

sed -i -e 's/weekly/size 30M/g' /etc/logrotate.d/monit

#Enable service on startup

systemctl restart monit

systemctl enable monit