Puppet users - May 2008 - Variable node name

Consider the following construct:

$frontends = [ "frontend0.mycompany.com",
"frontend1.mycompany.com" ]

node $frontends {
  ...
}

It seems that Puppet really wants a literal, not a variable, after the
node keyword. Incidentally, it doesn''t work with a single string such
as $frontend = "..." either. Is this behavior by design? It seems like
an attractive code structure, particularly with a setup like this:

$fe = [ "frontend0", "frontend1"...]
$be = [ "backend0", "backend1"...]

node $fe {
  configuration_to_talk_to_backends($be)
}

node $be {
  configuration_of_firewall_to_allow_frontends($fe)
}

If I can''t use a variable node name, then it seems I have to list my
machine names twice.

(Apologies to the bug-report lawyers who will complain that I haven''t
pasted working code in or a stacktrace. I have no excuse.)
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Mike schrieb:
> Consider the following construct:
> 
> $frontends = [ "frontend0.mycompany.com",
"frontend1.mycompany.com" ]
> 
> node $frontends {
>   ...
> }
> 
> It seems that Puppet really wants a literal, not a variable, after the
> node keyword. Incidentally, it doesn''t work with a single string
such
> as $frontend = "..." either. Is this behavior by design? 
I''d say "due to design", since node statements and variables
are
evaluated at different times.

 > It seems like
> an attractive code structure, particularly with a setup like this:
> 
> $fe = [ "frontend0", "frontend1"...]
> $be = [ "backend0", "backend1"...]
> 
> node $fe {
>   configuration_to_talk_to_backends($be)
> }
> 
> node $be {
>   configuration_of_firewall_to_allow_frontends($fe)
> }
> 
> If I can''t use a variable node name, then it seems I have to list
my
> machine names twice.
You can always use ExternalNodeClassification[1] to achieve some of what 
you want outside of your manifest.

The $certname or $hostname should provide another piece of the puzzle 
you need.

And finally you can use ExportedResources[2] to "send" resources from 
one host(group) to another host(group).


Regards, DavidS


[1] http://reductivelabs.com/trac/puppet/wiki/ExternalNodeClassification
[2] http://reductivelabs.com/trac/puppet/wiki/ExportedResources

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