*** Bug 1396351 has been marked as a duplicate of this bug. ***

*** Bug 1368037 has been marked as a duplicate of this bug. ***

*** Bug 1408571 has been marked as a duplicate of this bug. ***

Keeping in OSP12 since this is best practices / documentation only (of course supported by QE) but no code is involved - no risk on disrupting product delivery.

*** Bug 1462084 has been marked as a duplicate of this bug. ***

See https://blueprints.launchpad.net/tripleo/+spec/rhsm-integ-ansible where I think this blueprint would help to achieve this RFE.

There is an ansible module already existing for these needs: http://docs.ansible.com/ansible/latest/redhat_subscription_module.html we can just document the proceedure and publish some examples for now and build something around it in future releases

I think I just got this working on OSP10 and without needing to hack into rhel-registration.
rhel-registration is just a pre-config hook. It means it is usually called from your env file in this manner:
​
resource_registry:
 ​[...]
  OS::TripleO::NodeExtraConfig:                 all-pre-config.yaml
​
..which, in turn, points to something like this:
​​
resources:
  RhelRegistrationPreConfig:
    type: all-pre-config/rhel-registration.yaml
    properties:
        server: {get_param: server}

So, in order to override -some- parameters for some node Roles, I split the pre-config hooks this way:
​
resource_registry:
​[...]​
  OS::TripleO::ControllerExtraConfigPre:        controller-pre-config.yaml
  OS::TripleO::ComputeExtraConfigPre:           compute-pre-config.yaml
  OS::TripleO::CephStorageExtraConfigPre:       ​​ceph-pre-config.yaml
  OS::TripleO::NodeExtraConfig:                 all-pre-config.yaml
​

Each of these sub-files looks like this (here, the ceph pre-config file, ​ceph-pre-config.yaml ):
​
$ cat ceph-pre-config.yaml
heat_template_version: 2014-10-16
description: 'Extra Pre-Deployment Config, Ceph'
parameters:
  server:
    type: string
  rhel_reg_repos:
    type: string

resources:
  RhelRegistrationPreConfig:
    type: ​​all-pre-config/​​rhel-registration.yaml
    properties:
        server: {get_param: server}
        ​​rhel_reg_repos: "rhel-7-server-rpms,rhel-7-server-supplementary-rpms,rhel-7-server-optional-rpms,rhel-7-server-extras-rpms,rhel-7-server-openstack-10-rpms,rhel-7-server-openstack-10-tools-rpms,rhel-7-server-openstack-10-optools-rpms,rhel-7-server-openstack-10-devtools-rpms,rhel-7-server-rhceph-2-osd-rpms,rhel-7-server-rhceph-2-mon-rpms,rhel-7-server-rhceph-2-tools-rpms,rhel-7-server-satellite-tools-6.2-rpms"

outputs:
  deploy_stdout:
    value:
      list_join:
      - ''
      - - {get_attr: [RhelRegistrationPreConfig, deploy_stdout]}
​

Here, the '​rhel_reg_repos' parameter is role-dependent and the deployment will re-use the rest of the global parameters found in ​all-pre-config/rhel-registration.yaml before calling the actual script (rhel-registration).
Note, that I used '​rhel_reg_repos' in this example but really any parameter found in ​rhel-registration.yaml [1] can be overridden in this fashion.
Works for me (tm), tested on OSP10z6:

*** Bug 1456957 has been marked as a duplicate of this bug. ***

Feature test consistently passing downstream CI since puddle 2018-10-17.2

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2019:0045