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

Setting allowed client hosts for NRPE

In this recipe, we'll learn how to configure the nrpe daemon to answer requests from a particular IP address, typically the designated Nagios Core server or servers monitoring your network. This means that nrpe will not run plugins or return results for any check_nrpe request made from IP addresses not in this list.

This is an elementary security step in running an NRPE server, as, if your target host has interfaces or routes into untrusted networks, there is a risk of attackers making spurious requests for information about the system, clogging up your disk with logs from excessive check requests, or even possibly exploiting the nrpe daemon or the Nagios Plugins. This should be done in concert with a hardware or software firewall and security policy.

Getting ready

You should have a target host configured for checking in a Nagios Core 4.0 or later monitoring server. The target host should be running the nrpe daemon. You can verify that nrpe is running with...