[Puppet Users] Re: question about override parameter in node define

[Rahul Khengare]

hi ch Huang, 
   Here in this case you have to use parameterised class concept. Refer 
http://docs.puppetlabs.com/guides/parameterized_classes.html for 
parameterised classes concept.
You can restructure your manifests to solve your issue.

Refer following manifests,

*init.pp file*
here we pass the *master* parameter to class and inherits params class.
class hadoop (
   $master = $hadoop::params::master,
 ) inherits hadoop::params {

    file { "/tmp/conftest":
        ensure  => 'file',
        content => "${master}",
    }
}

*node.pp*
node 'default' {
    class {"hadoop":
      # pass the master parameter to hadoop class it will override the 
value present in the params file,
      # if we are not passing the master parameter then it take default 
value present in the params.pp file
         master => 'mymaster',
    }
}
node 'bm' inherits 'default' {       
}
 
*params.pp*
class hadoop::params {
      $master = $::hostname ? {
        default => 'HM',
      }
}

Hope this would help.


Thanks and Regards,
Rahul Khengare,
NTT DATA OSS Center, Pune, India.


On Tuesday, September 24, 2013 11:51:29 AM UTC+5:30, ch huang wrote:
>
> i expect the file /tmp/conftest content will be "mymaster" not default 
> "HM" on node bm ,but fail,anyone can help?
>  
> here my init.pp
>  
> class hadoop {
>         require hadoop::params
>          file { "/tmp/conftest":
>                 ensure  => 'file',
>                 content => "$hadoop::params::master",
>         }
> }
> here my node.pp
>  
> node 'default' {
>         include hadoop
> }
> node 'bm' inherits 'default' {
>         $hadoop::params::master = 'mymaster'
> }
>  
> here is my params.pp
>  
> class hadoop::params {
>            $master = $::hostname ? {
>                 default => 'HM',
>         }
> }
>
>

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