How to Install Nagios on Arch Linux

Nagios is an open-source monitoring tool that helps IT professionals and system administrators to monitor their infrastructure and applications. It provides alerts when there is a problem with the system. In this tutorial, we will show you how to install Nagios on Arch Linux.

Prerequisites

Before you start, make sure that your Arch Linux system is up-to-date by running the following command in your terminal:

sudo pacman -Syu

Also, ensure that you have installed Apache, PHP, and other required packages by running the following command:

sudo pacman -S apache php php-cgi gd

Step 1: Download and Install Nagios Core

1. Download the Nagios Core package from the Nagios official website using the following command:

   wget https://github.com/NagiosEnterprises/nagioscore/archive/nagios-4.4.6.tar.gz
   

2. Extract the Nagios Core package with the following command:

   tar -xvf nagios-4.4.6.tar.gz
   

3. Go to the Nagios Core directory:

   cd nagioscore-nagios-4.4.6/
   

4. Configure Nagios Core:

   ./configure --with-command-group=nagcmd
   

5. Now, compile and install Nagios Core:

   make all
   sudo make install
   sudo make install-init
   sudo make install-commandmode
   sudo make install-config
   

Step 2: Install Nagios Plugins

1. Download the Nagios Plugins package from the Nagios official website:

   wget https://github.com/nagios-plugins/nagios-plugins/archive/release-2.3.3.tar.gz
   

2. Extract the Nagios Plugins package:

   tar -xvf release-2.3.3.tar.gz
   

3. Go to the Nagios Plugins directory:

   cd nagios-plugins-release-2.3.3/
   

4. Configure Nagios Plugins:

   ./configure --with-nagios-user=nagios --with-nagios-group=nagios
   

5. Now, compile and install Nagios Plugins:

   make
   sudo make install
   

Step 3: Create a Nagios User and Group

1. Create a new user and group called nagios:

   sudo useradd nagios
   sudo groupadd nagios
   sudo usermod -aG nagios nagios
   

2. Set a password for the Nagios user:

   sudo passwd nagios
   

3. Add the Apache user (http) to the nagios group:

   sudo usermod -aG nagios http
   

Step 4: Configure Apache Web server

1. Create a new Apache configuration file for Nagios:

   sudo nano /etc/httpd/conf/extra/nagios.conf
   

2. Add the following lines to the file and save it:

   ScriptAlias /nagios/cgi-bin "/usr/local/nagios/sbin"
   <Directory "/usr/local/nagios/sbin">
       AllowOverride None
       Options ExecCGI
       Order allow,deny
       Allow from all
       Require all granted
   </Directory>
   
   Alias /nagios "/usr/local/nagios/share"
   <Directory "/usr/local/nagios/share">
       AllowOverride None
       Options None
       Order allow,deny
       Allow from all
       Require all granted
   </Directory>
   

3. Enable the Apache CGI module:

   sudo a2enmod cgi
   

4. Restart the Apache service:

   sudo systemctl restart httpd
   

Step 5: Verify Nagios Installation

1. Access Nagios web interface by typing the following URL in your web browser:

   http://your_server_IP/nagios/
   

2. Login with the Nagios admin credentials (default username: nagiosadmin, default password: nagios).

3. You should see the Nagios dashboard.

Congratulations! You have successfully installed and configured Nagios on Arch Linux. You can start monitoring your infrastructure and applications using Nagios.

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