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diff --git a/src/ceph/doc/man/8/rbd-nbd.rst b/src/ceph/doc/man/8/rbd-nbd.rst
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+:orphan:
+
+=========================================
+ rbd-nbd -- map rbd images to nbd device
+=========================================
+
+.. program:: rbd-nbd
+
+Synopsis
+========
+
+| **rbd-nbd** [-c conf] [--read-only] [--device *nbd device*] [--nbds_max *limit*] [--max_part *limit*] [--exclusive] map *image-spec* | *snap-spec*
+| **rbd-nbd** unmap *nbd device*
+| **rbd-nbd** list-mapped
+
+Description
+===========
+
+**rbd-nbd** is a client for RADOS block device (rbd) images like rbd kernel module.
+It will map a rbd image to a nbd (Network Block Device) device, allowing access it
+as regular local block device.
+
+Options
+=======
+
+.. option:: -c ceph.conf
+
+   Use *ceph.conf* configuration file instead of the default
+   ``/etc/ceph/ceph.conf`` to determine monitor addresses during startup.
+
+.. option:: --read-only
+
+   Map read-only.
+
+.. option:: --nbds_max *limit*
+
+   Override the parameter of NBD kernel module when modprobe, used to
+   limit the count of nbd device.
+
+.. option:: --max_part *limit*
+
+    Override for module param nbds_max.
+
+.. option:: --exclusive
+
+   Forbid writes by other clients.
+
+Image and snap specs
+====================
+
+| *image-spec* is [*pool-name*]/*image-name*
+| *snap-spec*  is [*pool-name*]/*image-name*\ @\ *snap-name*
+
+The default for *pool-name* is "rbd".  If an image name contains a slash
+character ('/'), *pool-name* is required.
+
+Availability
+============
+
+**rbd-nbd** is part of Ceph, a massively scalable, open-source, distributed storage system. Please refer to
+the Ceph documentation at http://ceph.com/docs for more information.
+
+
+See also
+========
+
+:doc:`rbd <rbd>`\(8)