Puppet users - May 2011 - Variable scoping / best practice

Hey there,

I have the following class that defines an array:

class iptables::hyperion {
  system_ips [
    ''ip'',
    ''ip'',
    ''ip'',
    ...
  ]
}

To use this variable in a template, I''m setting it to a
''local''
variable in the node definition:

node ''mynode'' inherits basenode {
  include iptables::hyperion
  $system_ips = $iptables::hyperion::system_ips

  class { iptables:
    fragments => [ ''hyperion.erb'']
  }
}

I can then access and use $system_ips in a template for that node (in
this case, ''hyperion.erb''). Does this fit a common pattern? I
know
that in a template you can use
''scope.lookupvar(''var'')''. Should I be
using said function in the template to access
$iptables::hyperion::system_ips, instead of reassigning it in the node
definition?

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On 05/12/2011 05:59 PM, Luke Baker wrote:
> Hey there,
> 
> I have the following class that defines an array:
> 
> class iptables::hyperion {
>   system_ips [
>     ''ip'',
>     ''ip'',
>     ''ip'',
>     ...
>   ]
> }
> 
> To use this variable in a template, I''m setting it to a
''local''
> variable in the node definition:
> 
> node ''mynode'' inherits basenode {
>   include iptables::hyperion
>   $system_ips = $iptables::hyperion::system_ips
> 
>   class { iptables:
>     fragments => [ ''hyperion.erb'']
>   }
> }
> 
> I can then access and use $system_ips in a template for that node (in
> this case, ''hyperion.erb''). Does this fit a common
pattern? I know
> that in a template you can use
''scope.lookupvar(''var'')''. Should I be
> using said function in the template to access
> $iptables::hyperion::system_ips, instead of reassigning it in the node
> definition?
> 
Hi,

I try and wrap almost all templates in defines and make all variables
used by the template parameteres of those defines.

I don''t need to care about scoping, I can sanely define default values
outside the template and I can document the set of required variables
( = mandatory parameters) easily.

Cheers,
Felix

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