[root@hulk ~]#
Last login: Tue Jul 19 19:15:50 2016 from 192.168.0.84
[root@hulk ~]# rbd map bar --name client.admin -m 192.168.127.12 -k /etc/ceph/ceph.client.admin.keyring
/dev/rbd0
[root@hulk ~]# rbd ls
bar
[root@hulk ~]# rbd shomapped
rbd: error parsing command 'shomapped'; -h or --help for usage
[root@hulk ~]# rbd showmapped
id pool image snap device
0  rbd  bar   -    /dev/rbd0
[root@hulk ~]# mkfs.ext4 -m0 /dev/rbd0
mke2fs 1.41.12 (17-May-2010)
Discarding device blocks:          0/4026531840