[libvirt-users] Efficient live disk backup with active blockcommit : Failed 'block-commit': Could not reopen file: Permission denied

[Keyur Bhalerao]

Thanks Kashyap for replying.

QEMU has permissions to the directory which is having images. I will look
into the AppArmor issue and find out more about this.
Also as per suggestion from the link i have uncommented the user and group
from the qemu.conf file - https://github.com/jedi4ever/veewee/issues/996

By checking more on the AppArmor and sVirt issue  , i have modified the
qemu.conf for security_driver="none". The result for this is no permission
error but another error which can be related to QEMU 2.3.0

virsh # blockcommit vm-01 vda --verbose --pivot --active
Block Commit: [100 %]error: failed to pivot job for disk vda
error: internal error: unable to execute QEMU command 'block-job-complete':
The active block job for device 'drive-virtio-disk0' cannot be completed

Searched more for this type of error and found -

https://bugs.launchpad.net/qemu/+bug/1455475

Looks like bug in QEMU 2.3.0 . Checking now with QEMU 2.1 for the same.

Let me know if anything to more look for.




Thanks,
Keyur Bhalerao


On Tue, Dec 8, 2015 at 5:18 AM, Kashyap Chamarthy <kchamart at redhat.com>
wrote:

> On Mon, Dec 07, 2015 at 12:52:34PM -0800, Keyur Bhalerao wrote:
>
> [. . .]
>
>  ubuntu at keyurubuntu:~$ virsh blockcommit vm-01 vda --active --verbose
> --pivot
> > error: internal error: unable to execute QEMU command 'block-commit':
> Could
> > not reopen file: Permission denied
>
> Fairly obvious suggestions, ensure permissions are set so that QEMU has
> permissions to the dir that contains images.
>
> Or it could be an AppArmor issue.
>
> Also, check your logs:
>
>     /var/log/libvirt/qemu/$VM.log
>     /var/log/libvirt/libvirtd.log  (assuming you have debug logging
>     enabled)
>
> > I am not sure why this is getting as permission denied. I have tried
> > couple of times reinstalling and creating new VMs . Every time when i
> > have tried to block-commit getting landed into  same error.
> >
> > Is there any troubleshooting or solution to this issue. Stuck on this
> > issue for last 2 days.  Quick help much appreciated.
> >
> > Thanks, Keyur Bhalerao
> >
> > Reference used -
> > http://wiki.libvirt.org/page/Live-disk-backup-with-active-blockcommit
> > -
> > http://kashyapc.com/2012/09/14/externaland-live-snapshots-with-libvirt/
>
> --
> /kashyap
>
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