I ran this loop for some 100 iterations without failure:
sudo sh -exc 'while true; do qemu-nbd --snapshot --connect /dev/nbd0
/srv/vm/adt-vivid-i386-cloud.img; sleep 0.5; [ -e /dev/nbd0p1 ]; mount
/dev/nbd0p1 /mnt; [ -d /mnt/root ]; umount /mnt; qemu-nbd --disconnect
/dev/nbd0; sleep 0.5; [ ! -e /
** Changed in: qemu (Ubuntu)
Importance: Undecided => High
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Title:
vivid: systemd breaks qemu-nbd mounting
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Hmm, maybe something else was going on. In an isolated test script, I
haven't reproduced the disconnect problem again yet.
I attached the script I'm using in case anyone else what's to give it
ago.
** Attachment added: "qemu-nbd-test.py"
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/143
Hmm, and one more thing: qemu-nbd --disconnect (at least sometimes)
doesn't seem to be working when booting with systemd:
$ ls /dev/nbd0*
/dev/nbd0 /dev/nbd0p1 /dev/nbd0p2 /dev/nbd0p5
$ sudo qemu-nbd --disconnect /dev/nbd0
/dev/nbd0 disconnected
$ echo $?
0
$ ls /dev/nbd0*
/dev/nbd0 /dev/nbd0p
Hmmm, there may still be an issue, as I didn't encounter this yesterday
when doing my task multiple times after booting with Upstart.
I'm mounting these qcow2 disk images in order to export a tarball of the
filesystem. First three tarballs exported swimmingly, but the fourth
time it seemed to hang
@didrocks - yup, it's working now! Thank you!
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Title:
vivid: systemd breaks qemu-nbd mounting
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Fix confirmed after upgrading :)
Thanks for the quick response!
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Title:
vivid: systemd breaks qemu-nbd mounting
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@Jason: I have uploaded yesterday 219-4ubuntu10 which may fix your issue
(cherry-picking a race upstream), can you try to upgrade and tell me if
this fixes it for you?
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** Summary changed:
- vivid: mounting with qemu-nbd fails
+ vivid: systemd breaks qemu-nbd mounting
** Description changed:
On Trusty and Utopic, this works:
$ sudo modprobe nbd
$ sudo qemu-nbd --snapshot -c /dev/nbd0 my.qcow2
$ sudo mount /dev/nbd0p1 /mnt
$ sudo umount /mnt
Bu
