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

Monitoring SSH for any host


In this recipe, we'll learn how to check that the SSH daemon on a remote host is responding to requests using the check_ssh plugin and the command of the same name. This will allow us to be notified as soon as there are problems connecting to the SSH service.

Getting ready

You should have a Nagios Core 4.0 or newer server with at least one host configured already. We'll use the example of troy.example.net, a host defined in its own file. You should also understand the basics of how hosts and services relate, which is covered in the recipes in Chapter 1, Understanding Hosts, Services, and Contacts.

It may be a good idea to verify first that the host for which you want to add monitoring is presently running the SSH service that requires checking. This can be done by running the ssh(1) client to make a connection to the host:

$ ssh troy.example.net

We should also check that the plugin itself will return the result required when run against the applicable host as the...