James Loope - Managing Infrastructure with Puppet
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Copyright 2011 James Loope
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This book is for anyone using or considering Puppet as a systems automation tool. Readers of this book should be familiar with Linux systems administration and basic Ruby. Ill cover the basics of using Puppet manifests for configuration management and techniques for executing and managing those configurations with MCollective and Facter. Ill often make suggestions that assume you are managing a virtualized infrastructure, but virtualization is not necessary to reap the benefits of this software.
This book is focused on Puppet 2.6.1 with Facter 1.5.6, and the MCollective version used is 1.0.1. Because of the very active development of all of these products, concepts and examples may not apply to earlier versions.
The following typographical conventions are used in this book:
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Puppet is a configuration management framework with an object-oriented twist. It provides a declarative language syntax and an abstraction layer that allow you to write heavily reusable and understandable configuration definitions. In this chapter, Ill cover the basics of the Puppet programs, the language syntax, and some simple class and resource definitions.
A Puppet deployment comes with a couple of pieces of software. For the most part, these can be installed from your chosen Linux distributions package manager. Alternatively, you can use the packages or source provided by Puppet Labs at http://www.puppetlabs.com/misc/download-options/. In my examples, Ive used Ubuntu Linux 11.04, but the packages are very similar in each distro. There are generally two packages: the Puppet package itself, which comes with Facter, and the Puppet Master server. For the purposes of this chapter, the Puppet and Facter package will suffice. When installed, it will include an init script to start an agent daemon at boot, which will look for a Puppet Master. For simplicitys sake, we will test manifests from the command line using the puppet apply command to begin:
Ubuntu:
apt-get install puppetFedora:
yum install puppetMac OS X:
port install puppet
Puppet helps you organize and execute configuration plans on servers. This is enabled through a resource abstraction layer that allows you to address the different configurable components of your system as generic objects. In the Puppet view, a server is a collection of resource objects that have a set of particular attributes that describe how that object looks.
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