params.pp vs Hiera

[Sergiu Cornea]

Hello guys,

I was wondering if someone can explain the difference between using the params.pp file and Hiera, as in my opinion they achieve the same thing using different methods.

For example, in the params.pp file you declare all or almost all the variables that are going to be used in your module and then call then in each manifest that you are using them and by using Hiera you declare the variables as you go in your manifest and set them using the Hiera file for that node.

Thank you,

Regards,

Sergiu

[Dan White]

Your observation is on target. 

Now consider a module that has to support multiple operating systems, multiple locations, et cetera, ad infinitum. You can either have a whopping huge params.pp file that contains all the logic and possibilities, or you set up Hiera to pick and choose for you, completely outside of your module and, IMNSHO, much easier to maintain.

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[Martin Alfke]

As a module developer I want to provide a module which will do sane defaults without forcing users to hiera.
Module developer (at the moment) put OS and application defaults into params.pp.
As a user you might want to override these defaults and specify them either as a parameter or via hiera.

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[Rich Burroughs]

I recommend this post on Gary Larizza's blog:

http://garylarizza.com/blog/2013/12/08/when-to-hiera/


Rich

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