Hi Yathi,
Le 08/10/2013 05:10, Yathiraj Udupi (yudupi) a écrit :
Hi,
Based on the discussions we have had in the past few scheduler
sub-team meetings, I am sharing a document that proposes an
updated Instance Group Model and API extension model.
This is a work-in-progress draft version, but sharing it for early
feedback.
https://docs.google.com/document/d/17OIiBoIavih-1y4zzK0oXyI66529f-7JTCVj-BcXURA/edit?usp=sharing
This model support generic instance types, where an instance can
represent a virtual node of any resource type. But in the context of
Nova, an instance refers to the VM instance.
This builds on the existing proposal for Instance Group Extension as
documented here in this blueprint:
https://blueprints.launchpad.net/nova/+spec/instance-group-api-extension
Thanks,
Yathi.
Well, I actually read the design document, and I'm strongly interested
in jumping to the project.
We started a few months ago a Stackforge project, called Climate [0],
aiming to reserve both physical and virtual resources. Initially, the
project came from a blueprint targeting only physical reservations [1],
and then Mirantis folks joined us having a new usecase for virtual
reservations (potentially implementing deferred starts, as said above).
Basically, the physical host reservation is not about deferred starts of
instances, it's about grouping for a single tenant a list of hosts, in
other words a whole host allocation (see [2]).
We'll provide to end-users a Reservation API allowing to define policies
for selecting hosts based on their capabilities [3] and then create host
aggregates (or "Pclouds" if we implement [2]). Actually, we could define
some policies in the Climate host aggregate for affinity and
network-proximity policies, so that any VM to boot from one of these
hosts would be applied these host aggregate policies.
As you maybe see, there are some concerns which are close in between
your BP [4] and our vision of Climate. What are your thoughts about it ?
[0] : https://github.com/stackforge/climate
[1] :
https://wiki.openstack.org/wiki/Blueprint-nova-planned-resource-reservation-api
[2] : https://wiki.openstack.org/wiki/WholeHostAllocation
[3] :
https://docs.google.com/document/d/1U36k5wk0sOUyLl-4Cz8tmk8RQFQGWKO9dVhb87ZxPC8/edit#heading=h.ujapi6o0un65
[4] :
https://blueprints.launchpad.net/nova/+spec/instance-group-api-extension
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