Nagios - Host And Service Monitoring Tool
Nagios is a popular host and service monitoring tool used by many administrators to keep an eye on their systems. It watches hosts across the local area network (LAN) and/or across the Internet, services that you can specify, alerting you when things go bad.
Nagios is included in several OS distributions and security packages. As of lately, Nagios has been voted Monitoring Application of the Year for 2007 by LinuxQuestions.org!

Rainer Brunold has written a step-by-step guide for deplyoing Nagios monitoring system with Novel SUSE Linux:
“The installation guide will show you how to install Nagios as well as some interesting extensions and how they integrate into each other. During this installation you will make many modifications to the installation that will help to understand how it works, how you can integrate systems and different services. I will also provide some articles about monitoring special services where I describe what they do and what configuration changes are needed. All together should give you a very good overview and documentation on how you can enhance the Nagios installation yourself.”
Also, John C. Welch makes a brief mention of Nagios, and how to easily install it on Mac OSX in his February 7th, 2008 “Xcode: Apple’s not-so-secret weapon” article for Macworld.
























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