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)


Hiera is a tool that stores and retrieves data in a hierarchical fashion. Each retrieval uses a distinct data source from each hierarchy layer and traverses your hierarchy from the most to the least specific level. The hierarchy is defined by the user as an array in a YAML file.

Puppet has Hiera support built in, and you can use it to separate data from code. From manifests, you will mainly perform lookups through the hiera function. In most cases, the respective entries will rely on fact values.

Another common way to employ Hiera through Puppet is to name the Hiera keys in the <class-name>::<parameter-name> format. When including a parameterized class, Puppet will look for such keys in Hiera. If the manifest does not supply a parameter value, Puppet automatically binds the value from Hiera to the respective parameter.

Manifests that boast large numbers of...