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Puppet Cookbook - Third Edition

Puppet Cookbook - Third Edition

By : Thomas Uphill, John Arundel
5 (2)
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Puppet Cookbook - Third Edition

Puppet Cookbook - Third Edition

5 (2)
By: Thomas Uphill, John Arundel

Overview of this book

This book is for anyone who builds and administers servers, especially in a web operations context. It requires some experience of Linux systems administration, including familiarity with the command line, file system, and text editing. No programming experience is required.
Table of Contents (12 chapters)
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11
Index

Using ERB templates


While you can deploy config files easily with Puppet as simple text files, templates are much more powerful. A template file can do calculations, execute Ruby code, or reference the values of variables from your Puppet manifests. Anywhere you might deploy a text file using Puppet, you can use a template instead.

In the simplest case, a template can just be a static text file. More usefully, you can insert variables into it using the ERB (embedded Ruby) syntax. For example:

  <%= @name %>, this is a very large drink.

If the template is used in a context where the variable $name contains Zaphod Beeblebrox, the template will evaluate to:

  Zaphod Beeblebrox, this is a very large drink.

This simple technique is very useful to generate lots of files that only differ in the values of one or two variables, for example, virtual hosts, and for inserting values into a script such as database names and passwords.

How to do it…

In this example, we'll use an ERB template to insert...

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