The best solution is to create a nova class or a generic libvirt-secret to store ceph key for both nova/cinder ceph-user and use that uuid in cinder::backend::rbd::rbd_secret_uuid
The best solution is to create a nova class or a generic libvirt-secret to store ceph key for both nova/cinder ceph-user and use that uuid in cinder: :backend: :rbd::rbd_ secret_ uuid