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

Using templates in your manifests

Since the end result of a template is a file, you won't be surprised that we use Puppet's file resource to work with templates. In fact, we use an attribute of the file resource that you've seen before—the content attribute.

Referencing template files

Recall from Chapter 2, Creating your first manifests, that you can use the content attribute to set a file's contents to a literal string:

file { '/tmp/hello.txt':
  content => "hello, world\n",

And, of course, you can interpolate the value of Puppet expressions into that string:

file { "/usr/local/bin/${task}":
  content => "echo I am ${task}\n",
  mode    => '0755',

So far, so familiar, but we can take one further step and replace the literal string with a call to the epp() function (file_epp.pp):

file { '/usr/local/bin/backup':
  content => epp(''),
  mode    => '0755',

Puppet will compile the template file referenced by, replacing any tags with the value of their...