VM terminates when doing a live migration

VM terminates when doing a live migration

[Daniel Bareiro]

Hi all!

I'm doing some testing with KVM Live Migration. SS01 (VMHost) has Debian
GNU/Linux 6.0.1 and Defiant (VMHost) has Debian GNU/Linux 5.0.8. Defiant
has Linux 2.6.32-15~bpo50+1 and 0.12.5+dfsg-3~bpo50+2, and SS01 has
Linux 2.6.32-31 and 0.12.5+dfsg-5+squeeze1. Both instalation are 32-bit,
but the kernel in SS01 is amd64 and the kernel in Defiant is 686.

Migration from Defiant to SS01 is completed successfully, but when
trying to migrate a VM from SS01 to Defiant, the VM terminates
(segfault?). This is due to the difference in the kernel of each VMHost?


Thanks in advance for your replies.

Regards,
Daniel

[1] http://www.linux-kvm.org/page/Migration
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Re: VM terminates when doing a live migration

[Michael Stroucken]

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On Sat, 21 May 2011, Daniel Bareiro wrote:

>
> Hi all!
>
> I'm doing some testing with KVM Live Migration. SS01 (VMHost) has Debian
> GNU/Linux 6.0.1 and Defiant (VMHost) has Debian GNU/Linux 5.0.8. Defiant
> has Linux 2.6.32-15~bpo50+1 and 0.12.5+dfsg-3~bpo50+2, and SS01 has
> Linux 2.6.32-31 and 0.12.5+dfsg-5+squeeze1. Both instalation are 32-bit,
> but the kernel in SS01 is amd64 and the kernel in Defiant is 686.
>
> Migration from Defiant to SS01 is completed successfully, but when
> trying to migrate a VM from SS01 to Defiant, the VM terminates
> (segfault?). This is due to the difference in the kernel of each VMHost?

Can you try saving the vms state to a file on ss01 and restoring it on 
defiant?

Do migrations between ss01 and another amd64 box work?

Greetings,
Michael.
--
Michael Stroucken
Pr Research Programmer
Carnegie Mellon University
"画虎画皮难画骨。 知人知面难知心。"

Re: VM terminates when doing a live migration

[Daniel Bareiro]

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Hi, Michael.

On Saturday, 21 May 2011 23:39:27 -0400,
Michael Stroucken wrote:

>> I'm doing some testing with KVM Live Migration. SS01 (VMHost) has
>> Debian GNU/Linux 6.0.1 and Defiant (VMHost) has Debian GNU/Linux
>> 5.0.8. Defiant has Linux 2.6.32-15~bpo50+1 and 0.12.5+dfsg-3~bpo50+2,
>> and SS01 has Linux 2.6.32-31 and 0.12.5+dfsg-5+squeeze1. Both
>> instalation are 32-bit, but the kernel in SS01 is amd64 and the
>> kernel in Defiant is 686.
>>
>> Migration from Defiant to SS01 is completed successfully, but when
>> trying to migrate a VM from SS01 to Defiant, the VM terminates
>> (segfault?). This is due to the difference in the kernel of each
>> VMHost?

> Can you try saving the vms state to a file on ss01 and restoring it on  
> defiant?

I tried following your suggestion but same thing happens:

ss01:~# kvm -m 256 -boot d -net nic,vlan=0,macaddr=52:54:67:92:9d:63 \
 -net tap -daemonize -vnc :15 -k es -localtime -cdrom \
 /mnt/systemrescuecd-x86-2.0.1.iso -monitor telnet:localhost:4055,server,nowait

ss01:~# telnet localhost 4055
Trying ::1...
Connected to localhost.
Escape character is '^]'.
QEMU 0.12.5 monitor - type 'help' for more information
(qemu) stop
(qemu) migrate_set_speed 4095m
(qemu) migrate "exec:gzip -c > STATEFILE.gz"
Connection closed by foreign host.

ss01:~# ps ax|grep systemrescuecd
26564 pts/0    S+     0:00 grep systemrescuecd


It appears that the 'migrate' command causes termination of the virtual
machine to these parameters as well.

> Do migrations between ss01 and another amd64 box work?

I have not tried a migration where both source and destination have the
same characteristics (i386 installation and amd64 kernel).


Thanks for your reply.

Regards,
Daniel
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