Book Image

Puppet 4.10 Beginner's Guide - Second Edition

By : John Arundel
Book Image

Puppet 4.10 Beginner's Guide - Second Edition

By: John Arundel

Overview of this book

Puppet 4.10 Beginner’s Guide, Second Edition, gets you up and running with the very latest features of Puppet 4.10, including Docker containers, Hiera data, and Amazon AWS cloud orchestration. Go from beginner to confident Puppet user with a series of clear, practical examples to help you manage every aspect of your server setup. Whether you’re a developer, a system administrator, or you are simply curious about Puppet, you’ll learn Puppet skills that you can put into practice right away. With practical steps giving you the key concepts you need, this book teaches you how to install packages and config files, create users, set up scheduled jobs, provision cloud instances, build containers, and so much more. Every example in this book deals with something real and practical that you’re likely to need in your work, and you’ll see the complete Puppet code that makes it happen, along with step-by-step instructions for what to type and what output you’ll see. All the examples are available in a GitHub repo for you to download and adapt for your own server setup.
Table of Contents (20 chapters)
Puppet 4.10 Beginner's Guide Second Edition
About the Author
About the Reviewer
Customer Feedback

Provisioning AWS resources from Hiera data

There's nothing wrong with managing AWS resources directly in code as we've done in the previous examples, but we can do just a little bit better.

In Chapter 6, Managing data with Hiera, we saw how to create Puppet resources directly from Hiera data. In that example (Building resources from Hiera hashes), we stored all the users for our infrastructure in a Hiera hash called users, and then used the each keyword to iterate over that hash, creating a user resource for each user. Here's the example code again (hiera_users2.pp):

lookup('users').each | String $username, Hash $attrs | {
  user { $username:
    * => $attrs,

The magic * character (the attribute splat operator) tells Puppet to use the contents of the $attrs hash as the attributes of the resource.

The advantage of describing resources as Hiera data is that when we come to add a new user or change the details for an existing user, we don't need to touch the Puppet code at all. Everything...