nagios

Linuxaria: "NagiosQL is a web based administration tool for Nagios 2.x, 3.x and Icinga 1.x."

BeginLinux: "Did you know you can easily change the way Nagios looks? Nagios has a number of options for frontends, or skins for the Nagios web interface."

Systhread: "With ICMP off it can be difficult to configure tools like Nagios for simple up and down checks. In this text getting around the no ICMP problem and a script to handle it for Nagios."

Ghacks: "Nagios is capable of running commands from external applications. This allows Nagios to expand farther than it could otherwise."

BeginLinux: "The major goal of the regional server is to distribute the results of all service checks to the central server.

The regional Nagios machines must use OCSP and OCHP in order to send the proper updates to the central server."

An It-Slave in the digital saltmine: "This guide will describe howto get it running in op5 Monitor. op5 Monitor is vanilla Nagios with some addons so it should be no problem to follow this guide in a Nagios environment"

BeginLinux: "This Nagios NSCA mini-course will provide you with the information you need so set up a Nagios server that receives passive communication from other servers and it will demonstrate how to set up a clients to send passive checks to the Nagios central server."

If you don't want to step up to a full monitoring solution such as Nagios you can create your own scripts for monitoring the things that you want to monitor, such as disk space.

The following script alerts you when your root partition is almost full:

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Packt: "Nagios offers a very powerful mechanism for receiving events and commands from external applications--the external commands pipe.

This is a pipe file created on a file system that Nagios uses to receive incoming messages."