On Dec 24, 2008, at 2:55 AM, Peter Meier wrote:
>
> Hi
>
>> So the way I have implemented it is that we have a basenode node
>> with the
>> common elements that all nodes get. The basenode is then inherited
>> by each
>> of the specific nodes, therefore you get something like:
>>
>> import "foo"
>> import "httpd"
>>
>> node basenode {
>> include foo
>> }
>>
>> node webnode inherits basenode {
>> include httpd
>> }
>>
>> node www1.example.com inherits webnode {}
>> node www2.example.com inherits webnode {}
>>
>>
>> Does that make sense?
>
>
> yeah that will work. However sooner or later you will get one
> problem here:
>
> if you use in the class httpd a variable which should be defined in
> the
> node and you will define this variable in the definition of
> www1.example.com, this variable will always be empty, as the class
> gets
> evaluated before the variable is set in the subnode of the webnode.
I understand this is just the way puppet works, but it's very
counterintuitive. If puppet wasn't a declarative language, it would
make perfect sense. Shouldn't puppet gather all variables and set
their values before evaluating resources? I haven't delved in to the
code to see if this is possible or not.
>
>
> So something like that, will give you problems:
>
> node webnode inherits basenode {
> include httpd
> }
>
> node www1.example.com inherits webnode {
> # i'm used in the class httpd
> $httpd_server_name = $fqdn
> }
>
> this is how inheritance works for nodes and which "confuses" a lot of
> people. Therefore imho the best thing is to do inheritance in a
> bunch of
> config-classes and using nodes only to set variables and include the
> config class in every node _after_ setting all the variables. Or
> switching over to external nodes, which will give you a lot more
> flexibility than the site.pp file.
>
> cheers pete
>
> >
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