Create a hiera.yaml config file

The Hiera config file is called hiera.yaml. Each environment should have its own hiera.yaml file.

1. In the main directory of one of your environments, create a new file called hiera.yaml. Paste the following contents into it:

   # <ENVIRONMENT>/hiera.yaml
   ---
   version: 5
   
   hierarchy:
     - name: "Per-node data"                   # Human-readable name.
       path: "nodes/%{trusted.certname}.yaml"  # File path, relative to datadir.
                                      # ^^^ IMPORTANT: include the file extension!
   
     - name: "Per-OS defaults"
       path: "os/%{facts.os.family}.yaml"
   
     - name: "Common data"
       path: "common.yaml"