Book Image

Puppet 5 Essentials - Third Edition

By : Felix Frank
Book Image

Puppet 5 Essentials - Third Edition

By: 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)

Combining Classes, Configuration Files, and Extensions into Modules

In the previous chapter, you learned about the tools that create modularized and reusable Puppet code in the form of classes and defined types. We discussed that almost all Puppet resources should be separated into appropriate classes, except if they logically need to be part of a defined type. This is almost enough syntax to build manifests for an entire fleet of agent nodes; each selecting the appropriate composite classes, which in turn include further required classes, with all the classes recursively instantiating the defined types.

What has not been discussed up until now is the organization of the manifests in the filesystem. It is obviously undesirable to stuff all of your code into one large site.pp file. The answer to this problem is provided by modules and will be explained in this chapter.

Besides...