doc: fix example command on creating ceph user

Signed-off-by: Yuan Zhou <yuan.zhou@intel.com>

diff --git a/doc/rbd/rbd-persistent-cache.rst b/doc/rbd/rbd-persistent-cache.rst
index d9121668dbb18716c371ae89878bdae27a64dcee..d4cecf5b6b5b9110c7786c638c89af942cdf5411 100644 (file)
--- a/doc/rbd/rbd-persistent-cache.rst
+++ b/doc/rbd/rbd-persistent-cache.rst
@@ -89,7 +89,7 @@ The ``ceph-immutable-object-cache`` daemon is available within the optional
 To `create a Ceph user`_, with ``ceph`` specify the ``auth get-or-create``
 command, user name, monitor caps, and OSD caps::
 
-  ceph auth get-or-create client.ceph-immutable-object-cache.{unique id} mon r osd 'profile rbd-read-only'
+  ceph auth get-or-create client.ceph-immutable-object-cache.{unique id} mon 'allow r' osd 'profile rbd-read-only'
 
 The ``ceph-immutable-object-cache`` daemon can be managed by ``systemd`` by specifying the user
 ID as the daemon instance::