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

Customizing an existing command


In this recipe, we'll customize an existing command definition. There are a number of reasons why you might want to do this. A common one is if a check is overzealous, sending notifications for the WARNING or CRITICAL states which aren't actually terribly worrisome; or, on the other hand, if a check is too forgiving and doesn't flag hosts or services as it has problems in recognizing when it would actually be appropriate to do so.

Another reason is to account for peculiarities in your own network. For example, if you run HTTP daemons on a large number of hosts on the alternative port 8080 that you need to check, it would be convenient to have a check_http_altport command available. We can do this by copying and altering the definition for the vanilla check_http command.

Getting ready

You should have a Nagios Core 4.0 or newer server running with a few hosts and services configured already. You should also already be familiar with the relationship between services...