Loope - Managing Infrastructure with Puppet
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Get started with Puppet, and learn how this popular configuration management framework helps you automate your servers. This concise introduction shows you how to use Puppets tools and templates to organize and execute configuration plans on Linux, Unix, and Windows servers. Through code samples and real-world examples, youll learn how to manage pools of servers and virtual instances, and how to administer access control. If youre new to Puppet, but familiar with systems administration and Ruby language basics, this book is the ideal way to start using this open source framework.
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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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This book is here to help you get your job done. In general, you may use the code in this book in your programs and documentation. You do not need to contact us for permission unless youre reproducing a significant portion of the code. For example, writing a program that uses several chunks of code from this book does not require permission. Selling or distributing a CD-ROM of examples from OReilly books does require permission. Answering a question by citing this book and quoting example code does not require permission. Incorporating a significant amount of example code from this book into your products documentation does require permission.
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Added .
Added a section on Resource Chaining in .
Minor updates for newer Puppet versions.
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:
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