root@node2:~# service ceph start mon
=== mon.a ===
Starting Ceph mon.a on node2...
[12078]: (33) Numerical argument out of domain
failed: 'ulimit -n 8192;  /usr/bin/ceph-mon -i a --pid-file /var/run/ceph/mon.a.pid -c /etc/ceph/ceph.conf '
Starting ceph-create-keys on node2...