Chapter 1. Introducing Nagios
Imagine you're an administrator of a large IT infrastructure. You have just started receiving e-mails that a web application has suddenly stopped working. When you try to access the same page, it just does not load. What are the possibilities? Is it the router? Maybe the firewall? Perhaps the machine hosting the page is down? The server process has crashed? Before you even start thinking rationally about 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 it still doesn't help.
After hours of nervous digging into the issue, you've finally found the root cause: although ...
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