Install Nagios on Ubuntu

The following is a guide to install Nagios Core on an Ubuntu machine.

 

Preparing for the Installation

 

First you will need to be root;

 

For convenience it is best to install ssh and vim;

 

Now you need to install some pre-requisites required for Nagios to correctly install/run;

 

Now add the user ‘nagios’ to the system;

 

Create nagcmd group to allow commands through the web;

 

 

Installing Nagios and the Plugins

 

First, make a directory to download the plugins to

 

Now you need to download Nagios and Nagios plugins;

 

Extracting Nagios so it can be compiled/installed;

 

Now you must run the install script and compile the source code;

 

Run the following command to install the web server

 

The next step is to create a password for the nagios web server login account, ‘nagiosadmin’

 

Remember this password as it is required to log on to the web interface.

 

Restart apache to apply the changes

 

Now you must extract the plugins;

 

Use the commands below to compile and install the plugins

 

Now configure Nagios to start on system start

 

Check the nagios configuration with the following command

 

Make note of this command, it is very important later on for debugging issues with config files.

 

If there are no errors, you are ready to start Nagios;

 

Now access the web interface from a web browser, navigating to
http://localhost/nagios/
or from within the network;
http://<hostname/ip>/nagios/
Congratulations, you are now done with the installation!

Please refer to our blog for a post on configuring your first host.

 

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