tripleo-heat-templates/environments/services/undercloud-cinder.yaml

resource_registry:
  OS::TripleO::Services::UndercloudCinderApi: ../../docker/services/cinder-api.yaml
  OS::TripleO::Services::UndercloudCinderScheduler: ../../docker/services/cinder-scheduler.yaml
  OS::TripleO::Services::UndercloudCinderVolume: ../../docker/services/cinder-volume.yaml