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Learning Nagios 4 by Wojciech Kocjan

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Chapter 1. Introducing Nagios

Imagine you're working as an administrator of a large IT infrastructure. You just started receiving e-mails that a web application just stopped working. When you try to access the same page, it just doesn't load. What are the possibilities? Is it the router? Is it the firewall? Perhaps the machine hosting the page is down? Before you even start thinking rationally on what to do, your boss calls about the critical situation and demands explanations. In all this panic, you'll probably start plugging everything in and out of the network, rebooting the machine…and that doesn't help.

After hours of nervous digging into the issue, you've finally found the solution: the web server was working properly, but it would time out ...

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