Install Nagios in Proxmox

July 2, 2024

1. What is Nagios ?

Nagios is an open-source monitoring tool.
It oversees systems, networks, and infrastructure.
Alerts users to potential issues.
Monitors network services, host resources, and server components.
Ensures reliable performance and quick response to problems.

2. Resources :

www.nagios.org
Nagios Downloads
Nagios Core
Nagios Frontends
Nagios Plugins
Nagios Add-ons
NRPE - How to Install Nagios RPE Remote Plugin Executor V4 from source \

3. Basic Installation

Run these commands:

apt update -y
apt upgrade -y

apt install apache2 -y

# Enable and start Apache2
systemctl enable apache2
systemctl start apache2

# install Nagios and pluggins
apt install nagios4 nagios4-core nagios-plugins-contrib -y

# Enable the Apache cgi modules with the a2enmod command:
a2enmod rewrite cgi

# restart apache
systemctl restart apache2

# start nagios service
systemctl enable nagios4
systemctl start nagios4

whereis nagios

ls -la /usr/lib/nagios

Open server in browser http://10.154.2.85/nagios4

4. Installing Nagios RPE Remote Pluggin

NRPE - Agent and Plugin Explained

Run this command on the server you want to monitor applications remotely

sudo su -

apt install nagios-nrpe-plugin

4.1 Configure Nagios NRPE Pluggin

whereis nagios

nano /etc/nagios/nrpe.cfg

Sample RPE Config file

5. Installing Nagios RPE Remote Pluggin Server

The main configuration file is /etc/nagios/nrpe.cfg.
The directory for drop-in configuration is /etc/nagios/nrpe.d/
An empty local configuration file is also provided /etc/nagios/nrpe_local.cfg

Run this on the server you want to use as Remote Pluggin Server

sudo su -

apt install nagios-nrpe-server

5.1 Configure Nagios NRPE Pluggin

whereis nagios

nano /etc/nagios/nrpe.cfg

Sample RPE Config file

Bibliography