Picking a pattern apart?

[Matthew Barr]

NOTE: of course, I just wrote this whole thing, and I think  using a hiera lookup in the parameter might be about the same.  That's at the end of this.    I'd still like to know if it breaks scope or the renderer...   

However, it might be an option for overriding params.pp settings,  without having to do the inherit pattern on the other classes in a module?

  of course, when we get hiera 2, that'll make life much easier.

------------------------

I just needed to do something a bit strange with hiera & 2 modules.

I know it works, since I just ran it.. but I'm not sure it's a good idea...  or  if it's just luck.

(Assume puppet 3.x)

Problem:  

db_url & amqp_url are both set  the same across all machines in a specific environment, but different per environment:  dev, stage, prod.

Perfect, you'd put this info into Hiera.  No problem.  

Automatic lookups-    This also gives the option of overriding a value from hiera in the node scope..

So:   

webserver::db_url: mysql://dev-url

webserver ::amqp_url: amqp://dev-url

+ 

class webserver( $db_url, $amqp_url)

{  blah

}

-----

node 'Web' {

  include webserver

}

node 'WebTest' {

  class {'webserver':

     db_url=> 'mysql://testbox'

  }

}

----

But what happens when you want to use it with a second class?  And they need the exact same data? You clearly don't want to replicate the keys in Hiera!

- The worker  class is screwed :)    

class worker ($db_url, $amqp_url)

{ other blah }

The obvious thought is to put the data into a common key in hiera:

 - I'd also like to preserve the option of overriding a specific parameter, like for testing with vagrant etc.

Here's the way I thought of: 

---

centralconfig::db_url: mysql://dev-url

centralconfig ::amqp_url: amqp://dev-url

----

class webserver {  

 require centralconfig

 $db_url = $centralconfig::db_url

 $amqp_url =  $centralconfig::amqp_url

blah

}

-------

node 'Web' {

  include webserver

}

node 'worker' {

  include worker

}

node 'webtest' {

  class {'centralconfig':

     db_url=> 'mysql://testbox'

  }

  include webserver

}

----

Now, if this is bad... 

You could convert the automatic lookups to be actual hiera_lookup calls.

class webserver( 

  $db_url = hiera('centralconfig::db_url') 

  $amqp_url = hiera('centralconfig::db_url') 

 ){  

blah

} 

And.. this might be the easiest, cleanest option..

[Dan Bode]

Hi Matthew,

FWIW, I ran into the same issue, and wound up creating an abstraction layer on top of my hiera lookups to do this:

It does a lot more than what you are asking for, but I thought it was worth mentioning since it was written to solve the same problem.

      https://github.com/bodepd/scenario_node_terminus/blob/master/README.md#data-mappings

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