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

Defining macros in a resource file

In this recipe, you'll learn how to define custom user macros in resource files. This is good practice for strings used in check_command definitions or other directives that are shared by more than one host or service. For example, take a look at the following example of writing the full path in a command_name directive:

command_name=/usr/local/nagios/libexec/check_ssh $HOSTADDRESS$

In lieu of this, we could write the following line:

command_name=$USER1$/check_ssh $HOSTADDRESS$

As a result, if the location of the check_ssh script changes, we only need to change the value of $USER1$ in the appropriate resource file to update all of its uses throughout the configuration.

Most of the macros in Nagios Core are defined automatically by the monitoring server, but up to 32 user-defined macros can be used as well in the $USERn$ form.

Getting ready

You will need to have a server running Nagios Core 4.0 or later and have access to the command line to change its configuration...