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
About the Author
About the Reviewer

Using macros as environment variables in a plugin

The examples of commands we've seen so far have included all the information needed to execute the checks as command-line options, for example, specifying the host address for check_ping or the HTTP port for check_http. An alternative way to get the information required to execute checks is via environment variables. While this isn't enabled by default, it's a method of providing a large amount of context information to a plugin that may save some configuration effort. However, it's only suitable for specialized applications of Nagios Core and, because it's resource intensive, it may not scale very well, meaning it could be unsuitable for very busy Nagios Core servers.

In this example, we'll enable environment macros and then write a short wrapper script for check_ping that reads the address to PING from its executing environment, rather than from a command-line option.

Getting ready

You should have a Nagios Core 4.0 or newer server running...