glusterfs/client/volume/keystone.yml

parameters:
  _param:
    keystone_glusterfs_service_host: ${_param:glusterfs_service_host}
  glusterfs:
    client:
      volumes:
        keystone-keys:
          path: /var/lib/keystone/fernet-keys
          server: ${_param:keystone_glusterfs_service_host}
          user: keystone
          group: keystone