dynamic node definition with hiera. not sure if this will work as intended.

puppet_example_classification.txt

/etc/puppet/hiera.yaml:

---
:backends:
  - yaml
:yaml:
  :datadir: /etc/puppet/hieradata
:hierarchy:
  - %{::clientcert}
  - %{::role}
  - common 


/etc/puppet/manifests/site.pp:

node default {
  $role = hiera("role")
  include $role
}

/etc/puppet/hieradata/web1.example.com.yaml:

---
role: roles::www


/etc/puppet/hieradata/db3.example.com.yaml:

---
role: roles::postgresql