[nova][ops] What should the compute service delete behavior be wrt resource providers with allocations?

Thomas Goirand zigo at debian.org
Thu Jun 13 21:03:58 UTC 2019

On 6/13/19 7:40 PM, Matt Riedemann wrote:
> On 6/12/2019 5:50 PM, Thomas Goirand wrote:
>>> 1. Don't delete the compute service if we can't cleanup all resource
>>> providers - make sure to not orphan any providers. Manual cleanup may be
>>> necessary by the operator.
>> I'd say that this option is ok-ish*IF*  the operators are given good
>> enough directives saying what to do. It would really suck if we just get
>> an error, and don't know what resource cleanup is needed. But if the
>> error is:
>> Cannot delete nova-compute on host mycloud-compute-5.
>> Instances still running:
>> 623051e7-4e0d-4b06-b977-1d9a73e6e6e1
>> f8483448-39b5-4981-a731-5f4eeb28592c
>> Currently live-migrating:
>> 49a12659-9dc6-4b07-b38b-e0bf2a69820a
>> Not confirmed migration/resize:
>> cc3d4311-e252-4922-bf04-dedc31b3a425
> I don't think we'll realistically generate a report like this for an
> error response in the API. While we could figure this out, for the
> baremetal case we could have hundreds of instances still managed by that
> compute service host which is a lot of data to generate for an error
> response.
> I guess it could be a warning dumped into the API logs but it could
> still be a lot of data to crunch and log.

In such case, in the error message, just suggest what to do to fix the

I once worked in a company that made me change every error message so
that each of them contained hints on what to do to fix the problem.
Since, I often suggest it.


Thomas Goirand (zigo)

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