Step-by-step – Nagios 4 Elementary OS 5 Installation

Installing

4. 4. Downloading Nagios

   Download Latest Nagios Core Linux Source

   Nagios Core tar.gz Archive

   Nagios Core

5. 5. Extracting Nagios

   Then Double-Click and Extract Nagios Core into /tmp.

   

   Or from Command Line:

   tar zxvf ~/Downloads/nagios*.tar.gz -C /tmp/

6. 6. Installing Nagios

   Moreover, to Compile and Install Nagios Core for Linux
   So first, access the Target:

   cd /tmp/nagios*

   Configure it:

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

   Make it:

   make all

   And finally, to Install it perform this Stack of Commands:

   sudo make install

   sudo make install-init

   sudo make install-config

   sudo make install-commandmode

7. 7. Installing Nagios Core Web UI

   Follow Installing Nagios Core Web Interface
   First, Make the needed directory:

   sudo mkdir -p /etc/httpd/conf.d/nagios.conf

   And then Install it:

   sudo make install-webconf