Mixing hiera and site.pp

[Alexander Dacre]

Hi,

I'm going through an initial deployment of Puppet and was looking to use hiera as much as possible, but it seems that many existing modules do not have hiera support.

The question I have is, is it 'OK' to have some bits of configuration for a node defined in hiera, and others in site.pp?

Thanks,

A

[Matthew Burgess]

Hi Alexander,

If you use the roles and profiles design pattern [0] then as suggested
at [1], your profile class could look up the required parameters from
hiera, do any validation required on it, then pass that data in as
standard class parameters.

Regards,

Matt.

[0] http://www.craigdunn.org/2012/05/239/
[1] http://garylarizza.com/blog/2014/02/17/puppet-workflow-part-2/

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[jcbollinger]

What do you mean about existing modules not having Hiera support?  Modules do not need special support for Hiera because every parameterized class's parameters can be provided via Hiera.  This is Puppet's automatic data binding feature, and it is by far the most common way that Hiera is used.  It is the only way that parameterized classes' parameters should be assigned from outside their modules.

It is also possible for DSL code to perform explicit data lookups, in which case a module might document specific Hiera keys (different from those corresponding to class parameters) by which module users can provide data.  This is not much done any more, however.


John

[Tony Thayer]

I work around this by creating wrapper classes that pull in my hiera data.

example:

class my_apache_config_module (

  $this_hostname = hiera('this_hostname')

){

  apache::vhost { $this_hostname:

    blah => "blah blah"