Complete Guide to Installing and Configuring Nagios on an AWS EC2 Instance

Nagios is a powerful open-source monitoring system used to oversee systems, networks, and infrastructure. This guide will take you step by step through the process of installing and configuring Nagios on an AWS EC2 instance running Linux.

Before starting, ensure that:

• Your EC2 instance is up and running.
• You have SSH access configured to connect to the instance.

Step-by-Step Installation & Configuration Guide ⇒

Step 1: Install Pre-Requisite Software

Before installing Nagios, we need to install essential dependencies such as Apache, PHP, a GCC compiler, and GD development libraries.

Run the following commands:

sudo su
yum install httpd php -y
yum install gcc glibc glibc-common -y
yum install gd gd-devel -y

These commands:

• Enable superuser (root) access.
• Install Apache (to serve the Nagios web interface) and PHP (required for the UI).
• Install GCC and GD libraries, which are required to compile Nagios and its plugins.

Step 2: Create a User for Nagios

Nagios should not be run as the root user for security reasons. Instead, we create a dedicated nagios user and assign it appropriate group permissions.

Run the following commands:

adduser -m nagios
passwd nagios