Linux

How to Install Nagios XI on Ubuntu 22.04

This guide walks you through installing Nagios XI on Ubuntu 22.04 LTS.

Alby Andersen
By Alby Andersen
cut command in linux

Nagios XI is a powerful enterprise-grade monitoring tool designed to track the performance of IT infrastructure, including servers, networks, and applications. It provides real-time insights, customizable dashboards, and automated alerts, making it a critical tool for system administrators.

Install Nagios XI on Ubuntu 22.04

Prerequisites

  • Ubuntu 22.04 server (minimal install recommended)
  • Root or sudo privileges
  • At least 4 GB RAM and 20 GB disk space
  • Static IP address configured
  • LAMP Stack (Apache, MySQL, PHP) will be installed automatically by the Nagios XI installer
How to Install Nagios XI on Ubuntu 22.04
Nagios XI

Step 1: Update System

sudo apt update && sudo apt upgrade -y

Reboot if kernel updates are applied:

sudo reboot

Step 2: Download Nagios XI Installer

Download the latest Nagios XI installer from the official site:

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cd /tmp
wget https://assets.nagios.com/downloads/nagiosxi/xi-latest.tar.gz

Extract the archive:

tar xzf xi-latest.tar.gz
cd nagiosxi

Step 3: Run the Installer

Execute the installation script:

sudo ./fullinstall

The installer will:

  1. Install required dependencies (Apache, PHP, MySQL, etc.)
  2. Configure the database
  3. Set up Nagios XI web interface

Step 4: Complete Web Setup

  1. Access the Nagios XI web interface:
   http://your-server-ip/nagiosxi/
  1. Follow the setup wizard to:
  • Accept the license agreement
  • Set up admin credentials
  • Configure basic settings

Step 5: Get License Key (Optional)

Nagios XI requires a license for full functionality:

  1. If you have a license, upload it via Admin > License Key.
  2. For evaluation, use the free trial mode.

Step 6: Configure Firewall

Allow HTTP/HTTPS traffic:

sudo ufw allow 80/tcp
sudo ufw allow 443/tcp
sudo ufw reload

Step 7: Verify Installation

Check services:

sudo systemctl status nagios
sudo systemctl status apache2
sudo systemctl status mysql

Key Post-Installation Steps

  1. Secure MySQL:
   sudo mysql_secure_installation
  1. Set Up Email Alerts:
    Configure SMTP in Admin > Notification Settings.
  2. Add Monitoring Targets:
    Use the web interface to add hosts/services.

Upgrade Nagios XI

To update to newer versions:

cd /tmp
wget https://assets.nagios.com/downloads/nagiosxi/xi-latest.tar.gz
tar xzf xi-latest.tar.gz
cd nagiosxi
sudo ./upgrade

Uninstall Nagios XI

To completely remove:

sudo ./uninstall

Important Notes

  • Default Credentials:
  • Web Interface: nagiosadmin / password set during installation
  • Configuration Files:
  • Main Config: /usr/local/nagios/etc/
  • Web Interface: /var/www/html/nagiosxi/
  • Logs: /usr/local/nagios/var/log/

Troubleshooting

  1. Port Conflicts:
    Ensure Apache (port 80/443) is not blocked.
  2. PHP Errors:
    Verify PHP extensions are installed:
   sudo apt install php-cli php-gd php-mysql php-curl
  1. Database Issues:
    Check MySQL/MariaDB service status and credentials in:
   /usr/local/nagiosxi/html/config.inc.php

For official documentation, visit Nagios XI Docs.

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