Puppet users - Jul 2011 - Override resource in nested class structure

Hello everybody

I have a set of nested classes and the deepest class looks after a
file resource.  I want all my nodes to be of the parent class type
except one of them needs a special copy of the same file resource.
How do I override the file resource for that specific node without
copying the entire class hierarchy for just that one node?  Example:

class { ''a'':
  include b
  ...
}

class { ''b'':
  include c
  ...
}

class { ''c'':
  file { ''foo'':
    ensure => file,
    source => ''puppet:///modules/...'',
  }
}

node default {
  include a
}

node ''specialnode'' {
  include a
  # OVERRIDE FILE RESOURCE ''foo'' HERE!!
}

I want ''specialnode'' to have it''s own file
''foo'' resource which
differs from the one in class ''c''.

Thank you!

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Here''s one way.  It''s ugly, but it works.

-- 
vagn


#! /usr/bin/puppet apply

# Hello everybody
#
# I have a set of nested classes and the deepest class looks after a
# file resource.  I want all my nodes to be of the parent class type
# except one of them needs a special copy of the same file resource.
# How do I override the file resource for that specific node without
# copying the entire class hierarchy for just that one node?  Example:

$default = "/tmp/foo"

define a($filename = "$default") {
   b { "b from a": filename => "$filename" }
   #...
}

define b($filename = "$default") {
   c { "c from b": filename => "$filename" }
   #...
}

define c($filename = "$default") {
   file { "$filename":
     ensure => file,
     content => "filename: $filename\n",
   }
   notice("title = $title, filename = $filename\n")
}

node default {
   a { "a from default": }
}

node ''specialnode'' {
   a { "a from specialnode": filename => "/tmp/baz" }
}

# I want ''specialnode'' to have it''s own file
''foo'' resource which
# differs from the one in class ''c''.
#
# Thank you!



On 07/01/2011 03:48 AM, Chris de Villiers wrote:
> Hello everybody
>
> I have a set of nested classes and the deepest class looks after a
> file resource.  I want all my nodes to be of the parent class type
> except one of them needs a special copy of the same file resource.
> How do I override the file resource for that specific node without
> copying the entire class hierarchy for just that one node?  Example:
>
> class { ''a'':
>    include b
>    ...
> }
>
> class { ''b'':
>    include c
>    ...
> }
>
> class { ''c'':
>    file { ''foo'':
>      ensure =>  file,
>      source =>  ''puppet:///modules/...'',
>    }
> }
>
> node default {
>    include a
> }
>
> node ''specialnode'' {
>    include a
>    # OVERRIDE FILE RESOURCE ''foo'' HERE!!
> }
>
> I want ''specialnode'' to have it''s own file
''foo'' resource which
> differs from the one in class ''c''.
>
> Thank you!
>
>    
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