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
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
Index

Preface

There are many bad ways to write a technical book. One simply rehashes the official documentation. Another walks the reader through a large and complex example, which doesn't necessarily do anything useful, except showing how clever the author is. Yet another exhaustively sets out every available feature of the technology, and every possible way you can use them, without much guidance as to which features you'll really use, or which are best avoided.

Like you, I read a lot of technical books as part of my job. I don't need a paraphrase of the documentation: I can read it online. I also don't want huge blocks of code for something that I don't need to do. And I certainly don't want an uncritical exposition of every single feature.

What I do want is for the author to give me a cogent and readable explanation of how the tool works, in enough detail that I can get started using it straight away, but not so much detail that I get bogged down. I want to learn about features in the order in which I'm likely to use them, and I want to be able to start building something that runs and delivers business value from the very first chapters.

That's what you can expect from this book. Whether you're a developer, a system administrator, or merely Puppet-curious, you're going to learn Puppet skills you can put into practice right away. Without going into lots of theory or background detail, I'll show you how to install packages and config files, create users, set up scheduled jobs, provision cloud instances, build containers, and so on. Every example deals with something real and practical that you're likely to need in your work, and you'll see the complete Puppet code to make 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.

After each exercise, I'll explain in detail what each line of code does and how it works, so that you can adapt it to your own purposes, and feel confident that you understand everything that's happened. By the end of the book, you will have all the skills you need to do real, useful, everyday work with Puppet, and there's a complete demo Puppet repository you can use to get your infrastructure up and running with minimum effort.

So let's get started.

What this book covers

Chapter 1, Getting started with Puppet, introduces Puppet and gets you up and running with the Vagrant virtual machine that accompanies this book.

Chapter 2, Creating your first manifests, shows you how Puppet works, and how to write code to manage packages, files, and services.

Chapter 3, Managing your Puppet code with Git, introduces the Git version control tool, shows you how to create a repository to store your code, and how to distribute it to your Puppet-managed nodes.

Chapter 4, Understanding Puppet resources, goes into more detail about the package, file, and service resources, as well as introducing resources to manage users, SSH keys, scheduled jobs, and commands.

Chapter 5, Variables, expressions, and facts, introduces Puppet's variables, data types, expressions, and conditional statements, shows you how to get data about the node using Facter, and how to create your own custom facts.

Chapter 6, Managing data with Hiera, explains Puppet's key-value database and how to use it to store and retrieve data, including secrets, and how to create Puppet resources from Hiera data.

Chapter 7, Mastering modules, teaches you how to install ready-to-use modules from the Puppet Forge using the r10k tool, introduces you to four key modules including the standard library, and shows you how to build your own modules.

Chapter 8, Classes, roles, and profiles, introduces you to classes and defined resource types, and shows you the best way to organize your Puppet code using roles and profiles.

Chapter 9, Managing files with templates, shows you how to build complex configuration files with dynamic data using Puppet's EPP template mechanism.

Chapter 10, Controlling containers, introduces Puppet's powerful new support for Docker containers, and shows you how to download, build, and run containers using Puppet resources.

Chapter 11, Orchestrating cloud resources, explains how you can use Puppet to provision cloud servers on Amazon AWS, and introduces a fully-automated cloud infrastructure based on Hiera data.

Chapter 12, Putting it all together, takes you through a complete example Puppet infrastructure that you can download and modify for your own projects, using ideas from all the previous chapter.

What you need for this book

You'll need a reasonably modern computer system and access to the Internet. You won't need to be a UNIX expert or an experienced sysadmin; I'll assume you can install software, run commands, and edit files, but otherwise I'll explain everything you need as we go.

Who this book is for

The main audience for this book are those who are new to Puppet, including system administrators and developers who are looking to manage computer server systems for configuration management. No prior programming or system administration experience is assumed. However, if you have used Puppet before, you'll get a thorough grounding in all the latest features and modules, and I hope you'll still find plenty of new things to learn.

Conventions

In this book, you will find a number of styles of text that distinguish between different kinds of information. Here are some examples of these styles, and an explanation of their meaning.

Code words in text are shown as follows: "Puppet can manage files on a node using the file resource"

A block of code is set as follows:

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

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

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

Any command-line input or output is written as follows:

sudo puppet apply /vagrant/examples/file_hello.pp
Notice: Compiled catalog for localhost in environment production in 0.07 seconds

New terms and important words are shown in bold. Words that you see on the screen, in menus or dialog boxes for example, appear in the text like this: "In the AWS console, select VPC from the Services menu".

Note

Warnings or important notes appear in a box like this.

Tip

Tips and tricks appear like this.

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