[Gluster-users] gluster and kvm livemigration

[Paul Boven]

Hi Bernhard,

Indeed I see the same behaviour:
When a guest is running, it is owned by libvirt:kvm on both servers.
When a guest is stopped, it is owned by root:root on both servers.
In a failed migration, the ownership changes to root:root.

I'm not convinced though that it is a simple unix permission problem, 
because after a failed migration, the guest.raw image is completely 
unreadable on the destination machine, even for root (permission 
denied), whereas I can still read it fine (e.g. dd or md5sum) on the 
originating server.

Regards, Paul Boven.

On 01/23/2014 08:10 PM, BGM wrote:
> Hi Paul,
> thnx, nice report,
> u file(d) the bug?
> can u do a
> watch tree - pfungiA <path to ur vm images pool>
> on both hosts
> some vm running, some stopped.
> start a machine
> trigger the migration
> at some point, the ownership of the vmimage.file flips from
> libvirtd (running machnie) to root (normal permission, but only when stopped).
> If the ownership/permission flips that way,
> libvirtd on the reciving side
> can't write that file ...
> does group/acl permission flip likewise?
> Regards
> Bernhard
>
> On 23.01.2014, at 16:49, Paul Boven <boven at jive.nl> wrote:
>
>> Hi Bernhard,
>>
>> I'm having exactly the same problem on Ubuntu 13.04 with the 3.4.1 packages from semiosis. It worked fine with glusterfs-3.4.0.
>>
>> We've been trying to debug this on the list, but haven't found the smoking gun yet.
>>
>> Please have a look at the URL below, and see if it matches what you are experiencing?
>>
>> http://epboven.home.xs4all.nl/gluster-migrate.html
>>
>> Regards, Paul Boven.
>>
>> On 01/23/2014 04:27 PM, Bernhard Glomm wrote:
>>>
>>> I had/have problems with live-migrating a virtual machine on a 2sided
>>> replica volume.
>>>
>>> I run ubuntu 13.04 and gluster 3.4.2 from semiosis
>>>
>>>
>>> with network.remote-dio to enable I can use "cache mode = none" as
>>> performance option for the virtual disks,
>>>
>>> so live migration works without "--unsafe"
>>>
>>> I'm triggering the migration now through the "Virtual Machine Manager" as an
>>>
>>> unprivileged user which is group member of libvirtd.
>>>
>>>
>>> After migration the disks become read-only because
>>>
>>> on migration the disk files changes ownership from
>>>
>>> libvirt-qemu to root
>>>
>>>
>>> What am I missing?
>>>
>>>
>>> TIA
>>>
>>>
>>> Bernhard
>>>
>>>
>>>
>>> _______________________________________________
>>> Gluster-users mailing list
>>> Gluster-users at gluster.org
>>> http://supercolony.gluster.org/mailman/listinfo/gluster-users
>>
>>
>> --
>> Paul Boven <boven at jive.nl> +31 (0)521-596547
>> Unix/Linux/Networking specialist
>> Joint Institute for VLBI in Europe - www.jive.nl
>> VLBI - It's a fringe science
>> _______________________________________________
>> Gluster-users mailing list
>> Gluster-users at gluster.org
>> http://supercolony.gluster.org/mailman/listinfo/gluster-users


-- 
Paul Boven <boven at jive.nl> +31 (0)521-596547
Unix/Linux/Networking specialist
Joint Institute for VLBI in Europe - www.jive.nl
VLBI - It's a fringe science