Book Image

Nagios Core Administration Cookbook

By : Tom Ryder
Book Image

Nagios Core Administration Cookbook

By: Tom Ryder

Overview of this book

Network monitoring requires significantly more than just pinging hosts. This cookbook will help you to comprehensively test your networks' major functions on a regular basis."Nagios Core Administration Cookbook" will show you how to use Nagios Core as a monitoring framework that understands the layers and subtleties of the network for intelligent monitoring and notification behaviour. Nagios Core Administration Guide introduces the reader to methods of extending Nagios Core into a network monitoring solution. The book begins by covering the basic structure of hosts, services, and contacts and then goes on to discuss advanced usage of checks and notifications, and configuring intelligent behaviour with network paths and dependencies. The cookbook emphasizes using Nagios Core as an extensible monitoring framework. By the end of the book, you will learn that Nagios Core is capable of doing much more than pinging a host or to check if websites respond.
Table of Contents (18 chapters)
Nagios Core Administration Cookbook
About the Author
About the Reviewers

Creating new NRPE command definitions securely

In this recipe, we'll learn how to securely create new command definitions for nrpe to run upon request by a monitoring server. We need to do this because even if we have a huge set of plugins installed on our target host running nrpe, the daemon will only run commands defined in its configuration file.

We'll also learn how arguments can be passed to these commands if strictly necessary, and about the potentially negative security consequences of this.

Getting ready

You should have a target host configured for checking in a Nagios Core 3.0 or later monitoring server. The target host should be running the nrpe daemon. You can verify that nrpe is running with pgrep or ps:

# pgrep nrpe
# ps -e | grep [n]rpe
nagios 29964 1 0 21:55 ? 00:00:01 nrpe

We can inspect the list of commands that nrpe is already configured to run by looking for command directives in its configuration file. By default, this file is /usr/local/nagios/etc/nrpe.cfg, and the...