NRPE (Nagios Remote Plugin Executor) is used for executing Nagios plugins on remote client systems. In previous article we had described about installation of Nagios Server on Ubuntu operating system. This article will help you to install NRPE on Ubuntu 18.04 LTS, 16.04 LTS & LinuxMint 19/18 systems.
Step 1 – Install NRPE and Plugins
NRPE is available under default apt repositories of Ubuntu systems. Execute the following command to install it
sudo apt-get update sudo apt-get install nagios-nrpe-server nagios-plugins
Step 2 – Configure NRPE Client
In NRPE configuration, first we need to nrpe to which nagios servers it accepts requests, For example your nagios server ip is 192.168.1.100, then add this ip to allowed hosts list. Edit NRPE configuration file /etc/nagios/nrpe.cfg and make changes like
we can add more Nagios servers in allowed hosts by comma separated list.
Now restart NRPE service. Now its ready to listen to requests from Nagios server
sudo /etc/init.d/nagios-nrpe-server restart
Step 3 – Verify Connection to NRPE from Nagios
Let’s log in to your Nagios server and verify that your Nagios server can communicate with NRPE service properly. Execute following command from Nagios server plugin directory, and we are assuming that your nrpe client-server IP is 192.168.1.11.
check_nrpe -H 192.168.1.11 NRPE v2.15
The output “NRPE v2.15” shows that Nagios server successfully communicated with NRPE.
Step 4 – Add Check Commands in NRPE
All the services check commands with the nagios plugins packages, which is by default installed in /usr/lib/nagios/plugins/ for 32 bit systems. Default installation adds few commands in configuration file. Add more commands as per your requirements like below
check_users]=/usr/lib/nagios/plugins/check_users -w 5 -c 10 command[ check_load]=/usr/lib/nagios/plugins/check_load -w 15,10,5 -c 30,25,20 command[ check_hda1]=/usr/lib/nagios/plugins/check_disk -w 20% -c 10% -p /dev/hda1 command[ check_zombie_procs]=/usr/lib/nagios/plugins/check_procs -w 5 -c 10 -s Z command[ check_total_procs]=/usr/lib/nagios/plugins/check_procs -w 150 -c 200
Step 5 – Start/Stop NRPE Service
Use following commands to start, stop or restart NRPE service. Each time we make any changes in configuration file required to restart service
sudo /etc/init.d/nagios-nrpe-server stop sudo /etc/init.d/nagios-nrpe-server start sudo /etc/init.d/nagios-nrpe-server restart