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)

Puppet Roles and Profiles

Now that we have a complete overview of the Puppet DSL and its concepts, it is time to look at how to build implementations based on Puppet that reflect your infrastructure settings and requirements.

In the early days of Puppet, it was common practice to add resources and variables to a node classification. This mostly led to duplicate code and made refactoring almost impossible. This pattern mostly reflected the usual admin work, which was done by configuring individual systems.

To avoid difficult to manage and hard to maintain code, a community around Puppet modules emerged. This community took care to implement technical parts of a system into Puppet modules. Modules have the benefit of being reusable by parameters and get bug-fixes and new implementations faster due to shared efforts.

As we now have a large set of modules available, we must rethink...