[openstack-dev] [Nova] [RFC] ResourceProviderTags - Manage Capabilities with ResourceProvider
Andrew Laski
andrew at lascii.com
Mon Aug 1 13:18:55 UTC 2016
On Mon, Aug 1, 2016, at 08:08 AM, Jay Pipes wrote:
> On 07/31/2016 10:03 PM, Alex Xu wrote:
> > 2016-07-28 22:31 GMT+08:00 Jay Pipes <jaypipes at gmail.com
> > <mailto:jaypipes at gmail.com>>:
> >
> > On 07/20/2016 11:25 PM, Alex Xu wrote:
> >
> > One more for end users: Capabilities Discovery API, it should be
> > 'GET
> > /resource_providers/tags'. Or a proxy API from nova to the placement
> > API....?
> >
> >
> > I would imagine that it should be a `GET
> > /resource-providers/{uuid}/capabilities` call on the placement API,
> > only visible to cloud administrators.
> >
> > When the end-user request a capability which doesn't support by the
> > cloud, the end-user needs to wait for a moment after sent boot request
> > due to we use async call in nova, then he get an instance with error
> > status. The error info is no valid host. If this is the only way for
> > user to discover the capabilities in the cloud, that sounds bad. So we
> > need an API for the end-user to discover the Capabilities which are
> > supported in the cloud, the end-user can query this API before send boot
> > request.
>
> Ah, yes, totally agreed. I'm not sure if that is something that we'd
> want to put as a normal-end-user-callable API endpoint in the placement
> API, but certainly we could do something like this in the placement API:
>
> GET /capabilities
>
> Would return a list of capability strings representing the distinct set
> of capabilities that any resource provider in the system exposed. It
> would not give the user any counts of resource providers that expose the
> capabilities, nor would it provide any information regarding which
> resource providers had any available inventory for a consumer to use.
This is what I had imagined based on the midcycle discussion of this
topic. Just information about what is possible to request, and no
information about what is available.
>
> Nova could then either have a proxy API call that would add the normal
> end-user interface to that information or completely hide it from end
> users via the existing flavors interface?
Please no more proxy APIs :)
>
> Thoughts?
>
> Best,
> -jay
>
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