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

Using check_by_ssh with key authentication instead of NRPE


While all of the previous recipes in this chapter show that NRPE can be very effectively tied down and secured, it may be that we require some means of authentication to a target host in order to run the appropriate Nagios plugins on it. The nrpe daemon does not require any authentication to return information about the host's state; as long as the IP addresses all match and the command is defined for running, it will return information.

If you already use SSH keys for a public key infrastructure in your network, then you may find it preferable to use the check_by_ssh plugin instead, which allows you to use public keys to authenticate with a target host before running any commands. This is only suitable if the target host runs a secure shell daemon.

In this recipe, we'll repeat the setup for the check_load plugin as done in the first recipe in this chapter, Monitoring local services on a remote machine with NRPE, but we'll use the...