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Puppet 5 Beginner???s Guide - Third Edition

By : John Arundel

4.5 (13)

Puppet 5 Beginner???s Guide

4.5 (13)

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.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Getting started with Puppet

1. 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

2. Creating your first manifests

Hello, Puppet – your first Puppet manifest

Managing packages

Services

Summary

3. Managing your Puppet code with Git

3. 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

4. Understanding Puppet resources

Files

Packages

Services

Users

Cron resources

Exec resources

Summary

5. Variables, expressions, and facts

5. Variables, expressions, and facts

Introducing variables

Introducing expressions

Finding out facts

Iterating over arrays

Summary

6. Managing data with Hiera

6. 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

7. 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

8. Classes, roles, and profiles

Classes

Parameter data types

Defined resource types

Managing classes with Hiera

Roles and profiles

Summary

9. Managing files with templates

9. Managing files with templates

What are templates?

Using templates in your manifests

Iteration in templates

Summary

10. Controlling containers

10. 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

11. 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

12. 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

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Introducing variables

A variable in Puppet is simply a way of giving a name to a particular value, which we could then use wherever we would use the literal value (variable_string.pp):

$php_package = 'php7.0-cli'

package { $php_package:
  ensure => installed,
}

The dollar sign ($) tells Puppet that what follows is a variable name. Variable names must begin with a lowercase letter or an underscore, though the rest of the name can also contain uppercase letters or numbers.

A variable can contain different types of data; one such type is a String (like php7.0-cli), but Puppet variables can also contain Number or Boolean values (true or false). Here are a few examples (variable_simple.pp):

$my_name = 'Zaphod Beeblebrox'
$answer = 42
$scheduled_for_demolition = true

Using Booleans

Strings and numbers are straightforward, but Puppet also has a special data type to represent true or false values, which we call Boolean values, after the logician George Boole. We have already...

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