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Puppet 4.10 Beginner's Guide

Puppet 4.10 Beginner's Guide - Second Edition

By : John Arundel
4.5 (4)
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Puppet 4.10 Beginner's Guide

Puppet 4.10 Beginner's Guide

4.5 (4)
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 (14 chapters)
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13
Index

Introducing expressions

Variables are not the only things in Puppet that have a value. Expressions also have a value. The simplest expressions are just literal values:

42
true
'Oh no, not again.'

You can combine numeric values with arithmetic operators, such as +, -, *, and /, to create arithmetic expressions, which have a numeric value, and you can use these to have Puppet do calculations (expression_numeric.pp):

$value = (17 * 8) + (12 / 4) - 1
notice($value)

The most useful expressions, though, are those which evaluate to true or false, known as Boolean expressions. The following is a set of examples of Boolean expressions, all of which evaluate to true (expression_boolean.pp):

notice(9 < 10)
notice(11 > 10)
notice(10 >= 10)
notice(10 <= 10)
notice('foo' == 'foo')
notice('foo' in 'foobar')
notice('foo' in ['foo', 'bar'])
notice('foo' in { 'foo' => 'bar' })
notice(&apos...
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