Otherwise client.admin will be privilege-less and the admin can't
access the cluster.
When creating a new monitor cluster, the keyring should also contain a ``client.admin`` key that can be used
to administer the system::
- ceph-authtool /path/to/keyring --gen-key -n client.admin
+ ceph-authtool /path/to/keyring --gen-key -n client.admin --set-uid=0 --cap mon 'allow *' --cap osd 'allow *' --cap mds 'allow'
The resulting keyring is fed to ``ceph-mon --mkfs`` with the ``--keyring <keyring>`` command-line argument.