Yes, it is that simple.
The other way of doing (some people prefer this way actually) is to put
your variables inside the actual class (not as parameters of the class),
for example:
class foo {
$my_parameter = hiera('foo::my_parameter', 'default_value')
$another_parameter = hiera('foo::another_parameter', 'some default value')
<...>
}
As you can see I didn't use any class parameters, I just put my variable
inside the class and used hiera() funciton to fetch the values from hiera
data. There are couple of things to understand here:
1. syntax of hiera() is: hiera('parameter_to_look_for',
'default_value_if_not_found')
2. the "parameter_to_look_for" can be anything you like, but the best
practice is to keep it consistent, so for example you have a class 'foo'
and a variable 'myvar' inside the class, then you should have it as
'foo::myvar' in hiera data files.
Hope this helps.
--
Vaidas
On Tuesday, 4 December 2012 00:00:21 UTC, Pete wrote:
>
> On 3 December 2012 22:38, Vaidas Jablonskis <jablo...@gmail.com<javascript:>
> > wrote:
>
>> Hi Pete,
>>
>> It depends on what version of puppet you use. If you use 3.x, then it has
>> hiera built-in. So it's very simple to write classes which are compatible
>> with v2.7 or v3.x versions.
>>
>
> I am testing on 3.
>
> I normally write something like this:
>>
>> class foo(
>> $parameter = undef,
>> ) {...}
>>
>
> Ah nice.
> That's pretty logical.
> I didn't think of doing that.
>
> What that means is that puppet will automatically call
>> hiera('foo::parameter') and tries to find a value for $parameter in the
>> hierarchy if it cannot find it, then the value of $parameter will be equal
>> to undef.
>>
>
> Ah I wasn't aware I could define vars like that in Hiera.
> Is it as simple putting this in one of my data files?
>
> foo::parameter: value
>
>
> Pete
>
>
>
>>
>> On Monday, 3 December 2012 03:42:08 UTC, Pete wrote:
>>>
>>> Hi everyone,
>>>
>>> I currently have a giant file with default variables I use in a lot of
>>> my modules and I override those at the node level if I need to.
>>> I thought I would give porting that data into a hiera setup.
>>>
>>> I worked out how to specify my data sources and started to make a go at
>>> moving some of my variables in the default data file.
>>>
>>> I thought heira would be smart and set a variable to undef if it
>>> couldn't find it but that doesn't seem to be the case. (unless I missed
>>> something in the rather sparse documentation)
>>> Is there a way of telling it to do this?
>>>
>>> I was also trying to work out how I automagically get my parametized
>>> classed to pull in vars from hiera. (The docs on that don't tell me much
>>> either.)
>>> Can anyone tall me how that works? Or do I have to use the hiera
>>> functions which isn't automagical in my book.
>>>
>>> My current variables are set with a default value in my main file and
>>> then I override those at the node level if I need to (so kind of the same
>>> way hiera does it anyway)
>>>
>>> So given all of that I can't see any reason to switch to using heira
>>> because my current setup works as-is (my variable file is getting pretty
>>> huge anyway but that isn't going to change with heira if it won't set a var
>>> to undef).
>>>
>>> What are the benefits or using an external source for variables instead
>>> of sticking them in my node definitions (which seems like it would be
>>> faster because it doesn't have to use an external source)?
>>>
>>> Thanks in advance.
>>> Pete.
>>>
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