Manual bootstrap of a Ceph MON on Ubuntu 14.04

A Ceph MON can be created and run manually for test purposes on Ubuntu-14.04 with:

$ sudo apt-get install ceph
$ cat > /etc/ceph/ceph.conf <<EOF
fsid = $(uuidgen)
mon_host =
auth_cluster_required = none
auth_service_required = none
auth_client_required = none
filestore_xattr_use_omap = true
$ sudo ceph-mon --cluster ceph --mkfs -i a --keyring /dev/null
ceph-mon: mon.noname-a is local, renaming to mon.a
ceph-mon: set fsid to 80562a76-f13e-4b1e-8fd1-de8f774f2683
ceph-mon: created monfs at /var/lib/ceph/mon/ceph-a for mon.a
$ sudo ceph-mon -i a

the cluster is not healthy because it has no OSD but it is available:

    cluster 1b5ef3ac-be8c-4658-8568-bd090b534b19
     health HEALTH_ERR 192 pgs stuck inactive; 192 pgs stuck unclean; no osds
     monmap e1: 1 mons at {a=}, election epoch 2, quorum 0 a
     osdmap e1: 0 osds: 0 up, 0 in
      pgmap v2: 192 pgs, 3 pools, 0 bytes data, 0 objects
            0 kB used, 0 kB / 0 kB avail
                 192 creating