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

Parameter data types

You should always specify types for your class parameters, as it makes it easier to catch errors where the wrong parameters or values are being supplied to the class. If you're using a String parameter, for example, if possible, make it an Enum parameter with an exact list of the values your class accepts. If you can't restrict it to a set of allowed values, specify a minimum length with String[x]. (If you need to specify a maximum length too, the syntax is String[min, max].)

Available data types

So far in this chapter, we've encountered the data types String, Enum, and Boolean. Here are the others:

  • Integer (whole numbers)

  • Float (floating-point numbers, which have optional decimal fractions)

  • Numeric (matches either integers or floats)

  • Array

  • Hash

  • Regexp

  • Undef (matches a variable or parameter which hasn't been assigned a value)

There are also abstract data types, which are more general:

  • Optional (matches a value which may be undefined or not supplied)

  • Pattern (matches...