OSD on Debian Jessie : No cluster conf found

• Reference Tracker

The problem is in the ceph-disk code.
ceph-disk prepare has a following log on the destination node

# ceph-disk -v prepare /dev/vdb
command: Running command: 
/usr/bin/ceph-osd --cluster=None --show-config-value=fsid

The value of cluster is None and that is incorrect. It must be ceph.

# /usr/bin/ceph-osd --cluster=None --show-config-value=fsid
00000000-0000-0000-0000-000000000000

# /usr/bin/ceph-osd --cluster=ceph --show-config-value=fsid
68eabcd3-a4fd-4c80-9e9c-56577d841234

The code change involved the following in /usr/sbin/ceph-disk:

prepare_parser.add_argument(
    '--cluster
    metavar='NAME', default='ceph', # added the parameter `default`
    help='cluster name to assign this disk to',
  )

• diff output

<         metavar='NAME',
---
>         metavar='NAME', default='ceph',

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