Comment 2 for bug 1646147

There are some instructions on how to configure the OpenStack deployment with an external Ceph cluster at http://tripleo.org/advanced_deployment/ceph_external.html

That needs to be done in addition to the inclusion of manila-cephfsnative-config.yaml and for Manila to work, the client.manila user needs to be created on the external Ceph cluster, or Manila needs to be configured to use client.openstack if the Ceph admin gave to that user the needed privileges.