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

Understanding passive checks

The previous parts of this book often mentioned Nagios performing checks on various software and machines. In such cases, Nagios decides when a check is to be performed, runs the check, and stores the result. These types of checks are called active checks.

Nagios also offers another way to let Nagios know about the status of hosts and services. It is possible to configure Nagios so that it will receive status information sent over a command pipe.

In such cases, other programs can either perform checks or report the current monitoring status by sending the current host or service status to Nagios. These types of checks are called passive checks. Nagios will still handle all notifications, event handlers, and dependencies between hosts and services.

Introducing active and passive checks

Active checks are the most common way to perform checks of services. They have a lot of advantages and some disadvantages. One of the problems is that such checks can take only a few...