[Openstack][nova] server groups

Ignazio Cassano ignaziocassano at gmail.com
Wed Apr 6 07:05:10 UTC 2022

We've 2 cases, those VMs are in the same group, one fails when migration is
launched, the other working well, you can see output of nova live migration
and spec on DB

not working:


Il Mer 6 Apr 2022, 06:53 Laurent Dumont <laurentfdumont at gmail.com> ha

> I cannot easily reproduce, but what does Nova complain about with the live
> migration? Any chance you can run it with DEBUG?
> On Wed, Apr 6, 2022 at 12:34 AM Ignazio Cassano <ignaziocassano at gmail.com>
> wrote:
>> Thanks Laurent. Sometimes the trick works and instances can migrate. We
>> do not understand what is wrong when instances fail to migrate.
>> We are usung soft-anti-affinity policy.
>> The spec field we inserted in both cases seeems the same.
>> Ignazio.
>> Il Mer 6 Apr 2022, 01:03 Laurent Dumont <laurentfdumont at gmail.com> ha
>> scritto:
>>> I'm trying to find where else this was discussed, but afaik, this was
>>> never supported.
>>> I am not sure if someone was able to "hack" it's way to a working setup.
>>> It's a bit of a shame because it makes server-groups really not flexible :(
>>> On Tue, Apr 5, 2022 at 3:04 PM Ignazio Cassano <ignaziocassano at gmail.com>
>>> wrote:
>>>> Hello, we noted that instances can be inserted in server groups only at
>>>> instance creation step but we need to insert in a server group some old
>>>> instances.
>>>> We tried to modify database nova_api server group tables but we noted
>>>> that we must modify spec in  request_specs table . For us is not clear how
>>>> to modify the spec value.
>>>> We tried to investigate looking at instances inserted in a server group
>>>> at creation step and we got issues in instance live migration.
>>>> Please, anyone could provide any utility to do it or any template ?
>>>> Thanks
>>>> Ignazio
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