Puppet: a (very) brief introduction

Presented to @CodeCumbria
2013-04-24

Transcript

1. Puppet:
   a (very) brief introduction
   Presented to @CodeCumbria
   2013-04-24
   

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2. http://schwuk.com
   @schwuk
   

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3. Once upon a time...
   ...there was server.
   It was a good little server.
   It only had one application to serve,
   and a nice sysadmin who cared for it.
   He'd configured it from bare metal,
   had hand-crafted each config file,
   and installed every package by hand.
   

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4. http://www.flickr.com/photos/bionicteaching/
   

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5. An unhappy ending
   That nice sysadmin got a job at Google...
   ...and that one application made the front
   page of Hacker News.
   The server broke.
   

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6. PANIC
   

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7. An unhappy ending beginning
   This time they could do it right.
   

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8. Configuration Management
   ...it does exactly what is says on the tin.
   

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9. What is Puppet?
   Configuration Management of course!
   ...and much more...
   ● Provisioning
   ● Configuration
   ● Automation
   ● Deployment
   

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10. How does work?
    Create a configuration
    Apply it to a server
    Rinse, repeat
    

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11. How does it work?
    Standalone
    A local manifest is
    manually applied to
    the local server
    Locally
    :)
    Client/Server
    The client sends it's
    information to the
    server
    The server sends back
    the configuration
    The client applies it
    

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12. (The official version)
    

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13. Don't get carried away
    Stick to standalone mode until you've got your
    head around the concepts
    

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14. Time to learn some new terms
    Resource Manifest
    

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15. Resource
    Describes a "thing"
    There are many types of things...
    user, group, file, package, service...
    http://docs.puppetlabs.
    com/references/latest/type.html
    

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16. Example resource
    user { 'dave':
    ensure => present,
    uid => '507',
    gid => 'admin',
    shell => '/bin/zsh',
    home => '/home/dave',
    managehome => true,
    }
    

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17. Querying resources
    $ puppet resource user dave
    

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18. Manifests
    Describe many "things" i.e. resources
    Use a .pp file extension
    Can be nested
    Can be combined
    

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19. Example manifest
    # ~/example.pp
    file {'testfile':
    path => '/tmp/testfile',
    ensure => present,
    mode => 0640,
    content => "I'm a test file.",
    }
    

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20. Applying manifests
    $ puppet apply example.pp
    

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21. Applying manifests
    $ puppet apply example.pp
    notice: /Stage[main]//File[testfile]/ensure: created
    $ cat /tmp/testfile
    I'm a test file.
    $ ls -lah /tmp/testfile
    -rw-r----- 1 root root 16 Feb 23 13:15 /tmp/testfile
    

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22. A real world example
    [REDACTED]
    (Not really, just too complex for a single slide)
    

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23. The tip of the iceberg
    Go forth and experiment!
    http://docs.puppetlabs.com/learning/
    http://docs.puppetlabs.com/
    

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24. Questions?
    @schwuk
    

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