On 11/16/2017 12:06 AM, Ramu, MohanX wrote:
Hi All,
I have a use case that I need to apply some filter (Custom traits)
while Placement API fetch the resource providers for launching instance.
So that I can have list of resource provided which meets my
condition/filter/validation. The validation is nothing but trust about
the Host(compute node) where I am going to launch the instances.
The below link says that it is possible, don’t have idea how to
implement/test this scenario.
https://specs.openstack.org/openstack/nova-specs/specs/ocata/implemented/resource-providers-scheduler-db-filters.html
we would rather make a HTTP call to the placement API on a specific REST
resource with a request that would return the list of resource
providers’ UUIDs that would match requested resources and traits
criterias based on the original RequestSpec object.
Unfortunately, you're going to need to wait for this to be possible with
the placement API. We're making progress here, but it's not complete yet.
You won't be using a custom filter (or any filter at all in the
nova-scheduler). Rather, you'll simply have the required trait in the
image or flavor and nova-scheduler will ask placement API for all
providers that have the required traits and requested resource amounts.
We're probably 3-4 weeks away from having this code merged.
Best,
-jay
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