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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

Efficiently distributing cron jobs


When you have many servers executing the same cron job, it's usually a good idea not to run them all at the same time. If the jobs all access a common server (for example, when running backups), it may put too much load on that server, and even if they don't, all the servers will be busy at the same time, which may affect their capacity to provide other services.

As usual, Puppet can help; this time using the inline_template function to calculate a unique time for each job.

How to do it…

Here's how to have Puppet schedule the same job at a different time for each machine:

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

    node 'cookbook' {
      cron { 'run-backup':
        ensure  => present,
        command => '/usr/local/bin/backup',
        hour    => inline_template('<%= @hostname.sum % 24 %>'),
        minute  => '00',
      }
    }
  2. Run Puppet:

    ubuntu@cookbook:~/puppet$ papply
    Notice: /Stage[main]//Node[cookbook]/Cron[run-backup]/ensure: created
    Notice: Finished catalog...
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