Book Image

Learning Nagios - Third Edition

By : Wojciech Kocjan, Piotr Beltowski
Book Image

Learning Nagios - Third Edition

By: Wojciech Kocjan, Piotr Beltowski

Overview of this book

Nagios, a powerful and widely used IT monitoring and management software for problem -solving. It detects problems related to your organizations infrastructure and helps in resolving the issue before it impacts the business. Following the success of the previous edition, this book will continue to help you monitor the status of network devices and also notify the system administrators of network problems. Starting with the fundamentals, the book will teach you how to install and configure Nagios for your environment. The book helps you learn how to end downtimes, adding comments and generating reports using the built-in Web interface of Nagios. Moving on, you will be introduced to the third-party web interfaces and applications for checking the status and report specific information. As you progress further in Learning Nagios, you will focus on the standard set of Nagios plugins and also focus on teach you how to efficiently manage large configurations and using templates. Once you are up to speed with this, you will get to know the concept and working of notifications and events in Nagios. The book will then uncover the concept of passive check and shows how to use NRDP (Nagios Remote Data Processor). The focus then shifts to how Nagios checks can be run on remote machines and SNMP (Simple Network Management Protocol) can be used from Nagios. Lastly, the book will demonstrate how to extend Nagios by creating custom check commands, custom ways of notifying users and showing how passive checks and NRDP can be used to integrate your solutions with Nagios. By the end of the book, you will be a competent system administrator who could monitor mid-size businesses or even large scale enterprises.
Table of Contents (19 chapters)
Learning Nagios - Third Edition
About the Authors
About the Reviewer


When creating or extending Nagios configuration to monitor a large number of resources, spend some time planning the layout of your configuration. Some people recommend one file for each single definition, while others recommend storing things in a single file per host. We recommend keeping similar things in the same file and maintaining a directory-based set of files.

In this chapter we have learned the following things:

  • Setting up efficient directory structure and file naming standards

  • Where to put objects depending on the type and hosts it is configured for

  • How to define dependencies so that Nagios can then detect root causes of problems

  • Using templates to ease defining a large number of objects

  • Accessing host, service, or contact-specific information with custom variables

  • What state flapping is and how Nagios detects when flapping occurs

The next chapter describes notifications and events in more detail. It will help us set up an efficient way to let the IT department know about errors...