username::
-RBD user Id. Optional, only needed if Ceph is not running on the PVE cluster.
+RBD user ID. Optional, only needed if Ceph is not running on the PVE cluster.
+Note that only the user ID should be used. The "client." type prefix must be
+left out.
krbd::
-Access rbd through krbd kernel module. This is required if you want to
-use the storage for containers.
+Enforce access to rados block devices through the krbd kernel module. Optional.
+
+NOTE: Containers will use `krbd` independent of the option value.
.Configuration Example for a external Ceph cluster (`/etc/pve/storage.cfg`)
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