Puppet users - Sep 2012 - Mixing up classes?

Hi.

What is the best way to mix classes?

For example, I have a class apache, which sets up web server, and have
class cobbler which needs to add few files to /etc/httpd/conf.d.

What''s the best way to do this? Include apache class in cobbler class?
Where can I find examples?

Or, if I use postgresql class to manage PgSQL, how can add a database
from some class that needs to create PgSQL database?


ty.


Ps. I can elaborate more if question is not clear enough...

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On Friday, September 7, 2012 8:02:50 AM UTC-5, Jakov Sosic
wrote:
>
> Hi. 
>
> What is the best way to mix classes? 
>
> For example, I have a class apache, which sets up web server, and have 
> class cobbler which needs to add few files to /etc/httpd/conf.d. 
>
> What''s the best way to do this? Include apache class in cobbler
class?
>

That is what I would do, provided that class ''apache'' is not
parametrized.
I.e.:

class cobbler {
  include ''apache''
  # ...
}

Unfortunately, that approach doesn''t work well if class
''apache'' is
parametrized.  If class ''apache'' is parametrized, or if for
some reason you
don''t want to make the module containing your cobbler class explicitly 
dependent on the module containing class ''apache'', then you
can declare the
dependency externally via Puppet''s chaining operators:

class { ''apache'':
  # some parameters
}

include ''cobbler''

Class[''apache''] -> Class[''cobbler'']

You can also set up finer-grained relationships between classes and 
individual resources, or between pairs of resources, using the
''before'' and
''requires'' metaparameters, including across class and even
module
boundaries, but that kind of deep coupling can present a maintenance 
problem.


John

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