Nagios is a server monitoring tool that can check anything you can imagine, and this book is here to show you how. From setting up your first “off-the-shelf” ping style checks through to writing your own plugins, this is the definitive guide. Tom Ryder is a systems administrator and former web developer from New Zealand. He uses Nagios Core as part of his “day job” as a systems administrator, monitoring the network for a regional internet service provider.
Book is available right now from http://www.packtpub.com/nagios-core-administration-cookbook/book
Tom aka tyrmored works a great deal with UNIX-like systems, being a particular fan of GNU/Linux, and writes about usage of open source command line development tools on his blog Arabesque: http://blog.sanctum.geek.nz.