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)

Building hierarchical data structures

In the previous section, we reduced the data problem to a simple need for key-value pairs that are specific to each node under Puppet management. Puppet and its manifests then serve as the engine that generates actual configuration from these minimalistic bits of information.

A simplistic approach to this problem is an ini style configuration file that has a section for each node that sets values for all configurable keys. Shared values will be declared in one or more general sections:


Rails applications customarily do something similar and store their configuration in a YAML format. The user can define different environments, such as production, staging, and testing. The values that are defined per environment override the global...