Book Image

Puppet 5 Essentials - Third Edition

By : Martin Alfke, Felix Frank
Book Image

Puppet 5 Essentials - Third Edition

By: Martin Alfke, Felix Frank

Overview of this book

Puppet is a configuration management tool that allows you to automate all your IT configurations, giving you control over what you do to each Puppet Agent in a network, and when and how you do it. In this age of digital delivery and ubiquitous Internet presence, it's becoming increasingly important to implement scaleable and portable solutions, not only in terms of software, but also the system that runs it. This book gets you started quickly with Puppet and its tools in the right way. It highlights improvements in Puppet and provides solutions for upgrading. It starts with a quick introduction to Puppet in order to quickly get your IT automation platform in place. Then you learn about the Puppet Agent and its installation and configuration along with Puppet Server and its scaling options. The book adopts an innovative structure and approach, and Puppet is explained with flexible use cases that empower you to manage complex infrastructures easily. Finally, the book will take readers through Puppet and its companion tools such as Facter, Hiera, and R10k and how to make use of tool chains.
Table of Contents (10 chapters)

Ordering and events among classes

Puppet's classes bear little or no similarity to classes that you find in object-oriented programming languages such as Java or Ruby. There are no methods or attributes. There are no distinct instances of any class. You cannot create interfaces or abstract base classes.

One of the few shared characteristics is the encapsulation aspect. Just like classes from OOP, Puppet's classes hide implementation details. To get Puppet to start managing a subsystem, you just need to include the appropriate class.

Passing events between classes and defined types

By sorting all resources into classes, you make it unnecessary (for your co-workers or other collaborators) to know about each single...