Book Image

Nagios Core Administration Cookbook - Second Edition

By : Tom Ryder
Book Image

Nagios Core Administration Cookbook - Second Edition

By: Tom Ryder

Overview of this book

Nagios Core is an open source monitoring framework suitable for any network that ensures both internal and customer-facing services are running correctly and manages notification and reporting behavior to diagnose and fix outages promptly. It allows very fine configuration of exactly when, where, what, and how to check network services to meet both the uptime goals of your network and systems team and the needs of your users. This book shows system and network administrators how to use Nagios Core to its fullest as a monitoring framework for checks on any kind of network services, from the smallest home network to much larger production multi-site services. You will discover that Nagios Core is capable of doing much more than pinging a host or to see whether websites respond. The recipes in this book will demonstrate how to leverage Nagios Core's advanced configuration, scripting hooks, reports, data retrieval, and extensibility to integrate it with your existing systems, and to make it the rock-solid center of your network monitoring world.
Table of Contents (18 chapters)
Nagios Core Administration Cookbook Second Edition
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Index

Managing brief outages with flapping


In this recipe, we'll learn how to use Nagios Core's state flapping detection and handling techniques to avoid sending excessive notifications when a host or service changes its state too frequently. This is useful in circumstances where a host or service is changing between OK to WARNING to CRITICAL states too frequently within the last 21 checks; if the percentage of state changes is too high, then Nagios Core will suppress further notifications and add a comment to the host or service, showing that it is flapping.

Flap detection is normally enabled by default in Nagios Core and it is part of the recommended generic-host host template and the generic-service service template. It's therefore likely that it's already enabled on most servers and we only need to check that it's still working.

Getting ready

You should have a Nagios Core 4.0 or newer server with at least one host and one service configured already. You should also have access to a working web...