On Tuesday, June 26, 2012 6:13:21 AM UTC-7, jcbollinger wrote:
> I sympathize and agree in principle with the view that it should be
> possible to re-declare the same parameterized class provided the parameters
> are all the same. Nevertheless, that has never been possible with Puppet
> 2.x's parameterized class declaration syntax. At the time that syntax and
> its rules were designed, the prevailing view at Puppetlabs was apparently
> that the resulting constraints were acceptable. It's one of the reasons I
> find parameterized classes *un*acceptable, but I can't call it a bug per
> se.
>
> I have been told that this will be better in Puppet 3, but I have not
> checked whether that's so.
>
>
It's better! It turns out the solution to class parameter conflicts is to
get the parameter values from somewhere outside the manifests. That way,
the decisions about what the values should be are already finished by the
time the catalog is being compiled, and you can just use "include" on
parameterized classes as many times as you want.
Our implementation is to get class parameters from Hiera. If a class has
parameters, using include on it it will automatically trigger a standard
Hiera lookup of those parameters. It'll be roughly equivalent to doing:
class {'myclass':
param1 => hiera('myclass::param1'),
param2 => hiera('myclass::param2'),
}
You can still use the class {'my_class':} style if you want to (with all
the same limitations as today), but since "include" will work now and Hiera
isn't very complicated, we figure most people can forget about it.
Anyway, as you can see, that changes the mental model a bit -- the hiera
yaml files become sort of a cascading configuration file for all of your
Puppet classes, and class parameters are like settings.
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