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Hi,

In my previous mail I have indicated the link to website of Kashyap that provides the sequence for cold snapshot and not live snapshot.

Could you try the sequence specified in comment ‘Kashyap Chamarthy (kashyapc)<https://launchpad.net/~kashyapc> wrote on 2014-06-27’ in [1] ?
Libvirt API equivalent of virsh managedsave is not something that is used in live snapshot according to that (I haven’t checked source code myself)

BR,
Konstantin
[1] https://bugs.launchpad.net/nova/+bug/1334398


From: Michael Stang [mailto:michael.stang at dhbw-mannheim.de]
Sent: Thursday, August 25, 2016 8:48 AM
To: Volenbovskyi Kostiantyn, INI-ON-FIT-CXD-ELC <Kostiantyn.Volenbovskyi at swisscom.com>; Saverio Proto <zioproto at gmail.com>
Cc: openstack-operators at lists.openstack.org
Subject: RE: [Openstack-operators] Mitaka live snapshot of instances not working

Hi Konstantin, hi Saverio

thank you for your answers.

I checked the version, these are

libvirt 1.3.1-1ubuntu10.1~cloud0
qemu  1:2.5+dfsg-5ubuntu10.2~cloud0

at our installation, system is Ubuntu 14.04.


I tried also the following from [2]

Command:

nova image-create test "snap_of_test" --poll
Result: Server snapshotting... 25% completeERROR (NotFound): Image not found. (HTTP 404)


Then I started trying step by step as in [2] but failed at the first step already:

Command:

virsh managedsave instance-00000367

Result:

error: Failed to save domain instance-00000367 state
error: internal error: unable to execute QEMU command 'migrate': Migration disabled: failed to allocate shared memory



I also checked on the compute nodes the directories:

/var/lib/libvirt/qemu/save/
/var/lib/nova/instances/snapshots/

there is 257G free space and the instance only has 1GB root disk, so I think its not missing space.



So is this maybe a problem with qemu? How can i enable 'migrate' and why is it disabled?



Thank you for your help.



Kind regards,
Michael







> Kostiantyn.Volenbovskyi at swisscom.com<mailto:Kostiantyn.Volenbovskyi at swisscom.com> hat am 24. August 2016 um 14:51 geschrieben:
>
>
> Hi,
> extract from [1] ((side note: I couldn't find that in config reference for Mitaka) is:
> "disable_libvirt_livesnapshot = True
> (BoolOpt) When using libvirt 1.2.2 live snapshots fail intermittently under load. This config option provides a mechanism to enable live snapshot while this is resolved. See https://bugs.launchpad.net/nova/+bug/1334398"
>
> I am not sure if Nova behaves like that in case you have disable_libvirt_livesnapshot=True (default in Liberty and Mitaka apparently...)
> In case it is not about that, then I would try to do it manually using something like [2] as guideline to see if it succeeds using Libvirt/QEMU without Nova.
>
> BR,
> Konstantin
> [1] http://docs.openstack.org/liberty/config-reference/content/list-of-compute-config-options.html
> [2] https://kashyapc.com/2013/03/11/openstack-nova-image-create-under-the-hood/
>
>
>
>
>
> From: Michael Stang [mailto:michael.stang at dhbw-mannheim.de]
> Sent: Wednesday, August 24, 2016 9:55 AM
> To: openstack-operators <openstack-operators at lists.openstack.org<mailto:openstack-operators at lists.openstack.org>>
> Subject: [Openstack-operators] Mitaka live snapshot of instances not working
>
> Hi all,
>
> we have a problem in our new mitaka installation, it seems that it is not possible to do a snapshot of a running instance (normal instance without an attached volume). When with try to do a snapshot we get a success message, but the snapshot is only showed shortly in the imagelist with status deleted. I we shutoff the instance and then do a snapshot it is working without problems.
>
> When we use a cinder volume as root disk instead an ephermal root disk a volume snapshot could be made without problem in running state of the instance.
>
> The same behaviour we have on an other installation of mitaka from our colleagues.
>
> Is this behaviour normal in Mitaka or ist this maybe a bug? Because in Juno we could do snapshots from running instances  without problems.
>
>
> Regards,
> Michael
>
>
>
> Michael Stang
> Laboringenieur, Dipl. Inf. (FH)
>
> Duale Hochschule Baden-Württemberg Mannheim
> Baden-Wuerttemberg Cooperative State University Mannheim
> ZeMath Zentrum für mathematisch-naturwissenschaftliches Basiswissen
> Fachbereich Informatik, Fakultät Technik
> Coblitzallee 1-9
> 68163 Mannheim
>
>
> michael.stang at dhbw-mannheim.de<mailto:michael.stang at dhbw-mannheim.de>
> http://www.dhbw-mannheim.de
>
>
>
>
Viele Grüße

Michael Stang
Laboringenieur, Dipl. Inf. (FH)

Duale Hochschule Baden-Württemberg Mannheim
Baden-Wuerttemberg Cooperative State University Mannheim
ZeMath Zentrum für mathematisch-naturwissenschaftliches Basiswissen
Fachbereich Informatik, Fakultät Technik
Coblitzallee 1-9
68163 Mannheim

Tel.: +49 (0)621 4105 - 1367
michael.stang at dhbw-mannheim.de<mailto:michael.stang at dhbw-mannheim.de>
http://www.dhbw-mannheim.de



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