5.2. Ceph containers for Red Hat OpenStack Platform with Ceph Storage
A Ceph container is required to configure OpenStack Platform to use Ceph, even with an external Ceph cluster. To be compatible with Red Hat Enterprise Linux 8, Red Hat OpenStack Platform (RHOSP) 15 requires Red Hat Ceph Storage 4. The Ceph Storage 4 container is hosted at registry.redhat.io, a registry that requires authentication.
You can use the heat environment parameter
ContainerImageRegistryCredentials to authenticate at
registry.redhat.io. For more information, see Container image preparation parameters.