cinder/files/backend/_ceph.conf

[{{ backend_name }}]
host={{ backend.get('host', grains.host) }}
volume_backend_name={{ backend_name }}
volume_driver = cinder.volume.drivers.rbd.RBDDriver
#
# Options defined in cinder.volume.drivers.rbd
#
# The RADOS pool where rbd volumes are stored (string value)
#rbd_pool=volumes
rbd_pool={{ backend.pool }}

# The RADOS client name for accessing rbd volumes - only set
# when using cephx authentication (string value)
#rbd_user=cinder
rbd_user={{ backend.user }}

# Path to the ceph configuration file (string value)
#rbd_ceph_conf=
rbd_ceph_conf={{ backend.get('rbd_ceph_conf','/etc/ceph/ceph.conf') }}

# Flatten volumes created from snapshots to remove dependency
# from volume to snapshot (boolean value)
#rbd_flatten_volume_from_snapshot=false
rbd_flatten_volume_from_snapshot={{ backend.get('flatten_volume_from_snapshot', False)|lower }}

# The libvirt uuid of the secret for the rbd_user volumes
# (string value)
#rbd_secret_uuid=da74ccb7-aa59-1721-a172-0006b1aa4e3e
rbd_secret_uuid={{ backend.secret_uuid }}

# Directory where temporary image files are stored when the
# volume driver does not write them directly to the volume.
# (string value)
#volume_tmp_dir=<None>

# Maximum number of nested volume clones that are taken before
# a flatten occurs. Set to 0 to disable cloning. (integer
# value)
#rbd_max_clone_depth=5

# Volumes will be chunked into objects of this size (in
# megabytes). (integer value)
#rbd_store_chunk_size=4

# Timeout value (in seconds) used when connecting to ceph
# cluster. If value < 0, no timeout is set and default
# librados value is used. (integer value)
#rados_connect_timeout=-1

# Report to clients of Cinder that the backend supports discard (aka.
# trim/unmap). This will not actually change the behavior of the backend or the
# client directly, it will only notify that it can be used. (boolean value)
#report_discard_supported = false
report_discard_supported={{ backend.get('report_discard_supported', False)|lower }}