[Openstack][nova] server groups

Laurent Dumont laurentfdumont at gmail.com
Wed Apr 6 21:25:36 UTC 2022


Can you detail the fields you changed? I had a look in the DB for the
request_specs and it's a big old JSON blurb.

What fields did you change?

On Wed, Apr 6, 2022, 12:15 PM Ignazio Cassano <ignaziocassano at gmail.com>

> We solved our issue: the spec field in request_specs table was wrong. Non
> live migration works fine
> Ignazio
> Il Mer 6 Apr 2022, 09:05 Ignazio Cassano <ignaziocassano at gmail.com> ha
> scritto:
>> 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:
>> https://paste.openstack.org/show/b4QfkVHkUpIC97E3aWAx/
>> working:
>> https://paste.openstack.org/show/busPt39bkfUzQthk1Tcf/
>> Ignazio
>> Il Mer 6 Apr 2022, 06:53 Laurent Dumont <laurentfdumont at gmail.com> ha
>> scritto:
>>> 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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