Book Image

Extending Puppet - Second Edition

By : Alessandro Franceschi, Jaime Soriano Pastor
Book Image

Extending Puppet - Second Edition

By: Alessandro Franceschi, Jaime Soriano Pastor

Overview of this book

Puppet has changed the way we manage our systems, but Puppet itself is changing and evolving, and so are the ways we are using it. To tackle our IT infrastructure challenges and avoid common errors when designing our architectures, an up-to-date, practical, and focused view of the current and future Puppet evolution is what we need. With Puppet, you define the state of your IT infrastructure, and it automatically enforces the desired state. This book will be your guide to designing and deploying your Puppet architecture. It will help you utilize Puppet to manage your IT infrastructure. Get to grips with Hiera and learn how to install and configure it, before learning best practices for writing reusable and maintainable code. You will also be able to explore the latest features of Puppet 4, before executing, testing, and deploying Puppet across your systems. As you progress, Extending Puppet takes you through higher abstraction modules, along with tips for effective code workflow management. Finally, you will learn how to develop plugins for Puppet - as well as some useful techniques that can help you to avoid common errors and overcome everyday challenges.
Table of Contents (19 chapters)
Extending Puppet Second Edition
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Preface
Index

Chapter 1. Puppet Essentials

There are moments in our professional life when we meet technologies that trigger an inner wow effect. We realize there's something special in them and we start to wonder how they can be useful for our current needs and, eventually, wider projects. Puppet, for me, has been one of these turning point technologies. I have reason to think that we might share a similar feeling.

If you are new to Puppet, you are probably starting from the wrong place, there are better fitting titles around to grasp its basic concepts.

This book won't indulge too much on the fundamentals, but don't despair, this chapter might help for a quick start. It provides the basic Puppet background needed to understand the rest of the contents and may also offer valuable information to more experienced users.

We are going to review the following topics:

  • The Puppet ecosystem, its components, history, and the basic concepts behind configuration management

  • How to install and configure Puppet commands and paths, to understand where things are placed

  • The core components and concepts; terms such as manifests, resources, nodes, and classes will become familiar

  • The main language elements—variables, references, resources defaults, ordering, conditionals, comparison operators, virtual and exported resources

  • How Puppet stores the changes it makes and how to revert them

The contents of this chapter are quite dense, so take your time to review and assimilate them if they sound new or look too complex; the path towards Puppet awareness is never too easy.