[Openstack] Benefits for moving live migration/resize/code migration/provision to conductor

Lau Jay jay.lau.513 at gmail.com
Sat Jun 1 15:18:59 UTC 2013


Hi Michael and other Stackers,

Sorry one more question, for provision VM instance, there is no interaction
between compute nodes, why also move provision logic to conductor?

Thanks,
Jay


2013/6/1 Lau Jay <jay.lau.513 at gmail.com>

> Thanks Michael for the answer, just want to dig more.
>
> From your answer, it seems that we do not want libvirt on one node opens
> up a connection to the other, but from the Gerrit code diff, I did not
> notice any change on nova compute, but only move the logic of live
> migraiton/resize/code migration from scheduler to conductor, and conductor
> still call nova compute directly and once the request cast to nova compute,
> libvirt on one node still opens up a connection to the another, so what is
> the difference?
>
> Thanks,
> Jay
>
>
>
> 2013/6/1 Michael Still <mikal at stillhq.com>
>
>> IIRC the discussion from the summit, there was concern about compute
>> nodes talking directly to each other. The way live migration works in
>> libvirt is that the libvirt on one node opens up a connection to the
>> other and then streams the instance across. If this is bounced off a
>> conductor, then it makes firewall rules much easier to construct.
>>
>> Cheers,
>> Michael
>>
>> On Sat, Jun 1, 2013 at 2:53 PM, Lau Jay <jay.lau.513 at gmail.com> wrote:
>> > Hi Stackers,
>> >
>> > I noticed that there are some blueprints trying to move the logic of
>> live
>> > migration/resize/code migration/provision from nova scheduler to nova
>> > conductor, but the blueprint did not describe clearly the benefits of
>> doing
>> > so, can some experts give some explanation on this?
>> >
>> > I know the original design for nova conductor is for a non-db nova
>> compute,
>> > but what's the reason of moving scheduling logic to nova conductor?
>> >
>> > Thanks,
>> >
>> > Jay
>> >
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>>
>
>
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