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

Setting up an event handler script


In this recipe, you'll learn how to set up an event handler script for Nagios Core. Event handlers are commands that are run on every state change for a host or service (whether for all hosts or services or just particular ones). They are defined in a similar way to notification commands and check commands for plugins.

In this example, we'll implement a simple event handler that writes the date, the host state, and the number of check attempts to a separate file for a single host. This is a simple example to demonstrate the concept; a more practical and complex application for the use of event handlers is given in the Setting up a redundant monitoring host recipe in Chapter 10, Security and Performance.

Getting ready

You will need a server running a Nagios Core 4.0 or higher version. You should be familiar with defining new commands, as per the Creating a new command recipe in Chapter 2, Working with Commands and Plugins, and the Defining a custom notification...