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Puppet 3 Cookbook

You're reading from   Puppet 3 Cookbook An essential book if you have responsibility for servers. Real-world examples and code will give you Puppet expertise, allowing more control over servers, cloud computing, and desktops. A time-saving, career-enhancing tutorial

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Product type Paperback
Published in Aug 2013
Publisher Packt
ISBN-13 9781782169765
Length 274 pages
Edition 2nd Edition
Languages
Tools
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Author (1):
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John Arundel John Arundel
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John Arundel
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Table of Contents (16) Chapters Close

Puppet 3 Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
1. Puppet Infrastructure 2. Puppet Language and Style FREE CHAPTER 3. Writing Better Manifests 4. Working with Files and Packages 5. Users and Virtual Resources 6. Applications 7. Servers and Cloud Infrastructure 8. External Tools and the Puppet Ecosystem 9. Monitoring, Reporting, and Troubleshooting Index

Using host resources


It's not always practical or convenient to use DNS to map your machine names to IP addresses, especially in cloud infrastructures where those addresses may be changing all the time. However, if you use entries in the /etc/hosts file instead, you then have the problem of how to distribute these entries to all machines and keep them up to date.

Here's a better way to do it; Puppet's host resource type controls a single /etc/hosts entry, and you can use this to map a hostname to an IP address easily across your whole network. For example, if all your machines need to know the address of the main database server, you can manage it with a host resource.

How to do it…

Follow these steps to create an example host resource:

  1. Modify your manifests/nodes.pp file as follows:

    node 'cookbook' {
      host { 'bitfieldconsulting.com':
        ensure => present,
        ip     => '109.74.195.241',
        target => '/etc/hosts',
      }
    }
  2. Run Puppet:

    ubuntu@cookbook:~/puppet$ papply
    Notice: /Stage[main...
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