[openstack-dev] [Openstack-operators] [ironic] [nova] [tripleo] Deprecation of Nova's integration with Ironic Capabilities and ComputeCapabilitiesFilter

Mark Goddard mark at stackhpc.com
Tue Oct 2 16:17:30 UTC 2018

On Tue, 2 Oct 2018 at 17:10, Jim Rollenhagen <jim at jimrollenhagen.com> wrote:

> On Tue, Oct 2, 2018 at 11:40 AM Eric Fried <openstack at fried.cc> wrote:
>> > What Eric is proposing (and Julia and I seem to be in favor of), is
>> > nearly the same as your proposal. The single difference is that these
>> > config templates or deploy templates or whatever could *also* require
>> > certain traits, and the scheduler would use that information to pick a
>> > node. While this does put some scheduling information into the config
>> > template, it also means that we can remove some of the flavor explosion
>> > *and* mostly separate scheduling from configuration.
>> >
>> > So, you'd have a list of traits on a flavor:
>> >
>> >
>> > And you would also have a list of traits in the deploy template:
>> >
>> > {"traits": {"required": ["STORAGE_HARDWARE_RAID"]}, "config": <RAID
>> blob>}
>> >
>> > This allows for making flavors that are reasonably flexible (instead of
>> > two flavors that do VMX and IPSEC acceleration, one of which does RAID).
>> > It also allows users to specify a desired configuration without also
>> > needing to know how to correctly choose a flavor that can handle that
>> > configuration.
>> >
>> > I think it makes a lot of sense, doesn't impose more work on users, and
>> > can reduce the number of flavors operators need to manage.
>> >
>> > Does that make sense?
>> This is in fact exactly what Jay proposed. And both Julia and I are in
>> favor of it as an ideal long-term solution. Where Julia and I deviated
>> from Jay's point of view was in our desire to use "the hack" in the
>> short term so we can satisfy the majority of use cases right away
>> without having to wait for that ideal solution to materialize.
> Ah, good point, I had missed that initially. Thanks. Let's do that.
> So if we all agree Jay's proposal is the right thing to do, is there any
> reason to start working on a short-term hack instead of putting those
> efforts into the better solution? I don't see why we couldn't get that done
> in one cycle, if we're all in agreement on it.

I'm still unclear on the ironic side of this. I can see that config of some
sort is stored in glance, and referenced upon nova server creation. Somehow
this would be synced to ironic by the nova virt driver during node
provisioning. The part that's missing in my mind is how to map from a
config in glance to a set of actions performed by ironic. Does the config
in glance reference a deploy template, or a set of ironic deploy steps? Or
does ironic (or OpenStack) define some config schema that it supports, and
use it to generate a set of deploy steps?

> // jim
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