[Puppet Users] Hiera Automatic Parameter Lookup Question

On Apr 18, 2013, at 4:15 PM, Alaric wrote:

This may be a dumb question, but here goes


So I'm running on Puppet 3.1.1 on RHEL5, and i've been using Hiera since 2.5/2.6 ish and it's been great!! I was reading up on Automatic Parameter Lookups and would love to use it for my modules. But I can't seem to ever get Hiera/Puppet to load the value i've set in my yaml files. I feel like I must be missing something.


I've worked my way through the docs, and am just not sure what I'm missing. I decided to use the 2.7 example, just to see what it did and noticed that this

$puppetservertest = hiera('puppet::puppetservertest', 'test'),


Doesn't work,

but this

$puppetservertest = hiera('puppetservertest', 'test'),

Does!

I'm working on my puppet module, so I was expecting the lookup to grab the variable from my puppet.yaml file (which it does in the second example)

My test puppet.yaml file is pretty simple, it looks like this


# Parameters for Puppet Class
---
puppetservertest: - 'puppet.example.com'


If anyone can shed some light on this it would be awesome!

Thanks

-a

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On Thursday, April 18, 2013 3:42:32 PM UTC-5, blalor wrote:
When you use the hiera() function, you ate by definition not doing
automatic param lookup. :-) whatever you put in for the first argument is
the key that will be looked up via hiera verbatim. If you leave the class
parameter without a default and instantiate it without a value, puppet will
prefix the name of the class to the param name with double colons and use
that as the lookup key in hiera.

On Apr 19, 2013, at 9:34 AM, jcbollinger wrote:

Moreover, I wanted to point out that, contrary to Brian's implication, automated class parameter binding is independent of whether parameters have explicit default values. If you do not bind a parameter's value via a class's declaration (and you shouldn't) then Puppet attempts to look up a value for it via hiera, regardless of whether an explicit default value is declared by the class. Only if the hiera lookup fails is an explicit default used.

On Friday, April 19, 2013 8:49:14 AM UTC-5, blalor wrote:
On Apr 19, 2013, at 9:34 AM, jcbollinger wrote:

Moreover, I wanted to point out that, contrary to Brian's implication,
automated class parameter binding is independent of whether parameters have
explicit default values. If you do not bind a parameter's value via a
class's declaration (and you shouldn't) then Puppet attempts to look up a
value for it via hiera, regardless of whether an explicit default value is
declared by the class. Only if the hiera lookup fails is an explicit
default used.


That's kind of cool.

class foo (
$bar => hiera('baz', 'bap'),
) { }

So $bar will be set to "bap" only if foo::bar and baz are not found in
Hiera, in that order?