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

The RRD files


As you learned earlier, RRD files are system-dependent. This means that you cannot simply copy RRD files to a new system: you will have to convert them first. Luckily, this can be done using the XML dump function of the rrdtool.

Time for action - dumping and loading an RRD file

Let's test the process of dumping an RRD file and re-creating it using the resulting XML file from the dump.

  1. Log on to your Cacti system.
  2. Change to the tmp directory.
  3. Copy any of the RRD files. In this example, you will use the hdd_used file for the local Linux machine:
cp /var/www/html/cacti/rra/local_linux_machine_hdd_used_16.rrd /tmp
  1. Now, dump the data from the RRD file to a new XML file:
rrdtool dump local_linux_machine_hdd_used_16.rrd > local_linux_machine_hdd_used_16.xml
  1. The resulting file is a plain-text XML file that can be looked at using the more command. Use the following command to display the XML file as seen in the following screenshot:
more local_linux_machine_hdd_used_16.xml
  1. Now, remove the original...