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

Monitoring individual nodes in a cluster


In this recipe, you'll learn how to monitor a collection of hosts in a cluster using the check_cluster plugin included in the Nagios Plugins standard. Being able to monitor more than one host collectively is useful in situations with redundancy; one of a set of hosts being in the DOWN state, perhaps for power conservation or maintenance reasons, is not necessarily a cause for notification. However, if a larger number or all of the hosts were down, we would definitely want to be notified. Using check_cluster allows us to arrange this.

Getting ready

You will need Nagios Core 4.0 or a newer server and to have shell access to change its backend configuration. You will also need to have at least two monitored hosts in a redundant setup for some function, such as database replication, nameservers, or load-balanced web servers.

You should also be familiar with the way hosts and services are defined, writing commands in particular; these concepts are discussed...