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Nagios: Building Enterprise-Grade Monitoring Infrastructures for Systems and Networks, Second Edition by David Josephsen

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Chapter 6. Watching: Monitoring Through the Nagios Plug-ins

Welcome to where the rubber meets the road. Until now, I’ve talked a lot about how Nagios works and how it is installed and configured. This chapter ties together the theoretical work of the previous chapters and talks about the nitty gritty of performing systems monitoring. As I’ve repeatedly said throughout the book, Nagios is a scheduling and notification framework. Small, single-purpose programs called plug-ins do the monitoring. So an in-depth discussion about monitoring will mostly be a discussion about plug-ins.

Nagios is limited only by the availability of plug-ins for a given task. Writing your own plug-ins, as described in Chapter 2, “Theory of Operations,” is trivial and highly ...

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