Book Image

Cacti Beginner's Guide - Second Edition

Book Image

Cacti Beginner's Guide - Second Edition

Overview of this book

Cacti is a performance measurement tool that provides easy methods and functions for gathering and graphing system data. You can use Cacti to develop a robust event management system that can alert on just about anything you would like it to. But to do that, you need to gain a solid understanding of the basics of Cacti, its plugin architecture, and automation concepts. Cacti Beginner's Guide will introduce you to the wide variety of features of Cacti and will guide you on how to use them for maximum effectiveness. Advanced topics such as the plugin architecture and Cacti automation using the command-line interface will help you build a professional performance measurement system. Designed as a beginner's guide, the book starts off with the basics of installing and using Cacti, and also covers the advanced topics that will show you how to customize and extend the core Cacti functionalities. The book offers essential tutorials for creating advanced graphs and using plugins to create enterprise-class reports to show your customers and colleagues. From data templates to input methods and plugin installation to creating your own customized plugins, this book provides you with a rich selection of step-by-step instructions to reach your goals. It covers all you need to know to implement professional performance measurement techniques with Cacti and ways to fully customize Cacti to fit your needs. You will also learn how to migrate Cacti to new servers. Lastly you will also be introduced to the latest feature of building a scalable remote poller environment. By the end of the book, you will be able to implement and extend Cacti to monitor, display, and report the performance of your network exactly the way you want.
Table of Contents (24 chapters)
Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
15
Online Resources

Linux monitoring


Let's look into the SNMP configuration in more detail.

Linux SNMP setup

The net-snmp package is providing the required snmp daemon. During the installation of Cacti in Chapter 1, Installing Cacti you have installed this package already on your Cacti system.

Time for action - enabling SNMP on a Linux server

Let's look into configuring the SNMP access on your Cacti server:

  1. Install net-snmpd if you have not done so already:
yum install -y net-snmp
  1. Now, edit the /etc/snmpd/snmpd.conf file:
vi /etc/snmpd/snmpd.conf
  1. Look for the following lines showing the default values on a CentOS 7 system:
  1. As this will provide access to a limited part of the SNMP tree, you will have to change the view lines to the following:
  1. Now, restart the snmp daemon and make sure to enable it on system start:
systemctl enable snmpdsystemctl start snmpd
What just happened?

You have installed and configured the snmpd daemon of a Linux system. By enabling and starting it, you will now be able to poll information from this...