Book Image

Puppet 5 Beginner's Guide - Third Edition

By : John Arundel
Book Image

Puppet 5 Beginner's Guide - Third Edition

By: John Arundel

Overview of this book

Puppet 5 Beginner’s Guide, Third Edition gets you up and running with the very latest features of Puppet 5, 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.

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Table of Contents (21 chapters)
Puppet 5 Beginner's Guide Third Edition
Puppet 5 Beginner's Guide Third Edition
Credits
Credits
About the Author
About the Author
Acknowledgments
Acknowledgments
About the Reviewer
About the Reviewer
www.PacktPub.com
www.PacktPub.com
Customer Feedback
Customer Feedback
Preface
Preface
Free Chapter
1
Getting started with Puppet
Getting started with Puppet
Why do we need Puppet anyway?
Configuration management tools
What is Puppet?
Getting ready for Puppet
Summary
2
Creating your first manifests
Creating your first manifests
Hello, Puppet – your first Puppet manifest
Managing packages
Services
Summary
3
Managing your Puppet code with Git
Managing your Puppet code with Git
What is version control?
Creating a Git repo
Distributing Puppet manifests
Fetching and applying changes automatically
Summary
4
Understanding Puppet resources
Understanding Puppet resources
Files
Packages
Services
Users
Cron resources
Exec resources
Summary
5
Variables, expressions, and facts
Variables, expressions, and facts
Introducing variables
Introducing expressions
Finding out facts
Iterating over arrays
Summary
6
Managing data with Hiera
Managing data with Hiera
Why Hiera?
Setting up Hiera
Adding Hiera data to your Puppet repo
Querying Hiera
Types of Hiera data
Interpolation in Hiera data
The hierarchy
Creating resources with Hiera data
Managing secret data
Summary
7
Mastering modules
Mastering modules
Using Puppet Forge modules
Using modules in your manifests
Exploring the standard library
Writing your own modules
Summary
8
Classes, roles, and profiles
Classes, roles, and profiles
Classes
Parameter data types
Defined resource types
Managing classes with Hiera
Roles and profiles
Summary
9
Managing files with templates
Managing files with templates
What are templates?
Using templates in your manifests
Iteration in templates
Summary
10
Controlling containers
Controlling containers
Understanding containers
Deployment with Docker
Managing Docker with Puppet
Managing Docker images
Building dynamic containers
Persistent storage for containers
Networking and orchestration
Running Puppet inside containers
Summary
11
Orchestrating cloud resources
Orchestrating cloud resources
Introducing the cloud
Setting up an Amazon AWS account
Getting ready to use puppetlabs/aws
Creating EC2 instances with Puppet
Managing custom VPCs and subnets
Provisioning AWS resources from Hiera data
Summary
12
Putting it all together
Putting it all together
Getting the demo repo
Understanding the demo repo
The bootstrap process
Adapting the repo for your own use
Bootstrapping a new node
Summary
The beginning
Index
Index

Hello, Puppet – your first Puppet manifest

The first example program in any programming language, by tradition, prints hello, world. Although we can do that easily in Puppet, let's do something a little more ambitious, and have Puppet create a file on the server containing that text.

On your Vagrant box, run the following command:

sudo puppet apply /examples/file_hello.pp
Notice: Compiled catalog for ubuntu-xenial in environment production in 0.07 seconds
Notice: /Stage[main]/Main/File[/tmp/hello.txt]/ensure: defined content as '{md5}22c3683b094136c3398391ae71b20f04'
Notice: Applied catalog in 0.01 seconds

We can ignore the output from Puppet for the moment, but if all has gone well, we should be able to run the following command:

cat /tmp/hello.txt
hello, world

Understanding the code

Let's look at the example code to see what's going on (run cat /example/file_hello.pp, or open the file in a text editor):

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

The code...

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