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

Introduction


Notifications in Nagios Core refer to the events fired and the messages generated when hosts or services change state, for the purpose of informing appropriate people or systems.

For example, when connectivity to a host is lost, it leaves the UP state and goes to DOWN state on the next check. This eventually generates a notification event and, provided the appropriate flags are set and a contact is available, a message about the state change is generated and dealt with in some way defined in the configuration.

The default text for such notifications goes into some detail about the problem, including the output from the appropriate plugin command:

***** Nagios *****
Notification Type: PROBLEM
Host: sparta.example.net
State: DOWN
Address: 192.0.2.21
Info: CRITICAL - Host Unreachable (192.0.2.21)
Date/Time: Sat Jul 13 21:45:09 NZST 2015

So with this kind of text generated as a result of the event, the next question is what Nagios Core should do with it. A common method of notification...