gistfile1.txt

[root@yomamma puppet]# hiera -d foreman::foreman_url -c hiera.yaml fqdn=yomamma.dedi.example.com
DEBUG: Tue Jul 30 16:15:39 +0100 2013: Hiera YAML backend starting
DEBUG: Tue Jul 30 16:15:39 +0100 2013: Looking up foreman::foreman_url in YAML backend
DEBUG: Tue Jul 30 16:15:39 +0100 2013: Looking for data source common
nil
[root@yomamma puppet]# cat hiera.yaml
---
:backends:
 - yaml
:yaml:
 :datadir: /etc/puppet/hieradata
:hierarchy:
 - "fqdn/%{::fqdn}"
 - "common"