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

Monitoring e-mail servers

Making sure that all e-mail-related services are working correctly is something that each hosting company and intranet administrator needs to perform on a daily basis. In order to do this, Nagios can watch these servers and make sure things are working as expected. This can be done by a remote machine to make sure that the services are accessible or can be monitored by the same server that offers these services.

Nagios can make sure that the processes are running and waiting for connections. It is also easy to verify whether a predefined user/password pair is working properly to make sure that a custom authorization system is working properly.

This section describes the commands that check e-mail servers using network connectivity. Plugins that verify specific processes on a server can be used to make sure a particular daemon is up and running as well.

Checking POP3 and IMAP servers

POP3 is a very popular protocol for retrieving e-mail messages from an e-mail client...