ceph-mds -i mds.0 -d
2013-07-03 13:50:53.308945 7f632c1a8780  0 ceph version 0.61.4 (1669132fcfc27d0c0b5e5bb93ade59d147e23404), process ceph-mds, pid 22730
starting mds.mds.0 at :/0
2013-07-03 13:50:53.316198 7f632c1a8780 -1 monclient(hunting): ERROR: missing keyring, cannot use cephx for authentication
2013-07-03 13:50:53.318880 7f632c1a8780 -1 mds.-1.0 ERROR: failed to authenticate: (95) Operation not supported
2013-07-03 13:50:53.318954 7f632c1a8780  1 mds.-1.0 suicide.  wanted down:dne, now up:boot
2013-07-03 13:50:53.319192 7f632c1a8780  0 stopped.