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

Introduction


While Nagios Core is still very useful when configured to monitor only a simple list of hosts and services, it includes some optional directives that allow you to define some structural and functional properties of the monitored network—specifically, how hosts and services interrelate. Describing this structure in the configuration calls for some additional intelligent behavior in the monitoring and notification that Nagios Core performs.

There are two main approaches to working with network structure in Nagios Core:

  • Host parent definitions allow an administrator to define the hierarchy of connectivity to monitored hosts from the "point of view" of the Nagios Core server. An example might be a server with the monitored address in another subnet linked to the Nagios Core server by a router. If the router enters the DOWN state, this triggers Nagios Core's host reachability logic to automatically determine which hosts will become inaccessible and flags these as UNREACHABLE rather...