[openstack-dev] [nova] Host maintenance notification

Chris Friesen chris.friesen at windriver.com
Mon Apr 6 18:18:51 UTC 2015

On 04/06/2015 08:52 AM, Jay Pipes wrote:
> On 04/05/2015 11:21 PM, Chris Friesen wrote:
>> On 04/05/2015 09:17 PM, Jay Pipes wrote:
>>> On 03/30/2015 03:16 AM, Balázs Gibizer wrote:
>>>> Hi,
>>>> I have the following scenario. I have an application consisting of
>>>> multiple VMs on different compute hosts. The admin puts one of the
>>>> hosts into maintenance mode (nova-manage service disable ...) because
>>>> there will  be some maintenance activity on that host in the near
>>>> future. Is there a way to  get a notification from Nova when a host
>>>> is put into maintenance mode? If it is not the case today would the
>>>> nova community support such an addition to Nova?
>>>> As a subsequent question is there a way for an external system to
>>>> listen to such a notification published on the message bus?
>>> Hi Gibi!
>>> I don't believe there is a notification currently sent when a service is
>>> disabled. I agree this would be a good (and pretty easy) addition to
>>> Nova.
>>> Please feel free to add a blueprint in Launchpad. I don't see this as
>>> needing a
>>> full spec, really. It shouldn't be more than a few lines of code to
>>> send a new
>>> notification message.
>> Wouldn't a new notification message count as an API change?  Or are we
>> saying that it's such a small API change that any discussion can happen
>> in the blueprint?
>> (I'm trying to figure out how this relates to
>> "http://docs.openstack.org/developer/nova/devref/kilo.blueprints.html"
>> which says that any API change requires a spec.)
> Hmm, good point. I think this is kinda borderline whether it's an API change,
> but probably best to be safe and submit a small spec. Thanks, Chris.

Sorry for making more work for you Gibi. :)


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