How to set up the PM2 service monitor on Nagios
How to set up the PM2 service monitor on Nagios
Step 1:
Log in to your Ubuntu or Centos server as a user with sudo privileges. You can use SSH or directly access the server.
$ssh root@Ip
Step 2:
Edit the /etc/nagios/nrpe.cfg configuration file and search for COMMAND DEFINITIONS sections. Here you can define or update check commands.
$vi /etc/nagios/nrpe.cfg
Please update the below command for the PM2 check.
$command[check_pm2_port]= /usr/lib/nagios/plugins/check_pm2_port.sh
Step 3:
Please go to the plugin's path and Create a new script file, such as check_pm2_port.sh, in the specified path. The script should check if the PM2 service port is open or not.
$cd /usr/lib/nagios/plugins/
create a new script file
$Vi check_pm2_port.sh
Please copy the below commands, paste the check_pm2_port.sh file, and save the file.
$#!/bin/bash
# Modify the following variables according to your setup
PM2_HOST="localhost"
PM2_PORT=3000
nc -z -w 2 $PM2_HOST $PM2_PORT > /dev/null 2>&1
result=$?
if [ $result -eq 0 ]; then
echo "OK - PM2 service is listening on port $PM2_PORT"
exit 0
else
echo "CRITICAL - PM2 service is not listening on port $PM2_PORT"
exit 2
fi
sample output
Step 4:
Give permission to the check_pm2_port.sh file and follow the below command:
$chmod 755 check_pm2_port.sh
Step 5:
Next, restart the NRPE service. Now it is ready to listen to requests from the Nagios server
$systemctl restart nagios-nrpe-server
open the Nagios server
Step 6:
Go to the path of the object using the below commands:
$cd /usr/local/nagios/etc/objects/
open the commands.cfg files
$vi commands.cfg
The below line is already in the file, so skip that line.
define command{
$command_name check_nrpe
command_line /usr/lib/nagios/plugins/check_nrpe -H $HOSTADDRESS$ -t 60 -c $ARG1$
}
Here, the above command wants to add the below command to in file and save it to files.
$define command {
command_name check_pm2_port
command_line /usr/lib/nagios/plugins/check_nrpe -H $HOSTADDRESS$ -c check_pm2_port
}
Step 7:
Please open the below for the configuration path
$cd /usr/local/nagios/etc/servers/
open the configuration file using the below commands
$vi testserver2.cfg
Add the below lines for pm2 checking the configuration and save it
$define service {
use generic-service ; Name of service template to use
host_name testserver2
service_description pm2_service
check_command check_nrpe!check_pm2_port
contact_groups admins
notifications_enabled 1
}
Step 8:
Save the configuration file
And finally, restart Nagios to apply recent configuration changes:
$systemctl restart nagios
It is working pm2 status the below snapshot
