From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: qemu-nbd: Failed to bind socket: No such file or directory
Date: Thu, 26 Mar 2015 22:24:12 +0100
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=E7=99=BD=E3=81=84=E7=86=8A=EF=BC=A0=E7=9B=B8=E6=92=B2=E9=81=93 <guix-devel=
_gnu.org@sumou.com> skribis:

> Using qemu, I'm trying to mount a qcow2 image to manipulate its
> files. I insmoded the nbd kernel module. The block devices exist:
>
> ~$ ls -l /dev/nbd*
> brw-rw---- 1 root disk 43,  0 Mar 24 18:09 /dev/nbd0
> brw-rw---- 1 root disk 43,  1 Mar 24 18:09 /dev/nbd1
> brw-rw---- 1 root disk 43, 10 Mar 24 18:09 /dev/nbd10
> brw-rw---- 1 root disk 43, 11 Mar 24 18:09 /dev/nbd11
> brw-rw---- 1 root disk 43, 12 Mar 24 18:09 /dev/nbd12
> brw-rw---- 1 root disk 43, 13 Mar 24 18:09 /dev/nbd13
> brw-rw---- 1 root disk 43, 14 Mar 24 18:09 /dev/nbd14
> brw-rw---- 1 root disk 43, 15 Mar 24 18:09 /dev/nbd15
> brw-rw---- 1 root disk 43,  2 Mar 24 18:09 /dev/nbd2
> brw-rw---- 1 root disk 43,  3 Mar 24 18:09 /dev/nbd3
> brw-rw---- 1 root disk 43,  4 Mar 24 18:09 /dev/nbd4
> brw-rw---- 1 root disk 43,  5 Mar 24 18:09 /dev/nbd5
> brw-rw---- 1 root disk 43,  6 Mar 24 18:09 /dev/nbd6
> brw-rw---- 1 root disk 43,  7 Mar 24 18:09 /dev/nbd7
> brw-rw---- 1 root disk 43,  8 Mar 24 18:09 /dev/nbd8
> brw-rw---- 1 root disk 43,  9 Mar 24 18:09 /dev/nbd9
>
> But:
>
> ~$ sudo qemu-nbd -c /dev/nbd0 disk.qcow2
> Failed to bind socket: No such file or directory

I have no idea, but I would recommend running:

  sudo strace -o log qemu-nbd -c /dev/nbd0 disk.qcow2

and then find out the socket name in =E2=80=98log=E2=80=99 above =E2=80=9CF=
ailed to bind
socket=E2=80=9D.

HTH,
Ludo=E2=80=99.