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
About the Authors
About the Reviewer

Reserved names and allowed characters

As with every language, Puppet DSL has some restrictions on the names we can give to its elements and the allowed characters.

As a general rule, for names of resources, variables, parameters, classes, and modules we can use only lowercase letters, numbers, and the underscore (_). Usage of hyphens (-) should be avoided (in some cases it is forbidden; in others it depends on Puppet's version).

We can use uppercase letters in variables names (but not at their beginning) and any character for resources' titles.

Names are case sensitive, and there are some reserved words that cannot be used as names for resources, classes, or defines or as unquoted word strings in the code, such as:

and, case, class, default, define, else, elsif, false, if, in, import, inherits, node, or, true, undef, unless, main, settings, $string.

A fully updated list of reserved words can be found here: