[Feature] Add a Filter plugin to ensure that non-GPU pods are not sch…

[Zeel-Patel]

…eduled on GPU nodes

This plugin is widely being used at Uber and thought can be useful for open source community.

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What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

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Does this PR introduce a user-facing change?

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✅ Deploy Preview for kubernetes-sigs-scheduler-plugins canceled.

Name	Link
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[PiotrProkop]

I think we should move both of those values so they can be changed via configuration file. Some clusters may also have more than one gpu resource on the node, so it would be great if we could provide a list of gpu resources.

[googs1025]

+1, Using configuration files is better than hard-coding. Maybe we don't need to limit ourselves to GPU resources, can we extend it to different resources?

[PiotrProkop]

Overall I think this could be a generic plugin that filters out pod not requesting some specific resource from nodes advertising those resources with except for device-plugin of dra-plugin(in the future).

[googs1025]

/ok-to-test

[k8s-ci-robot]

@Zeel-Patel: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-scheduler-plugins-verify	e90d648	link	true	/test pull-scheduler-plugins-verify

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[googs1025]

Can we have a KEP document?

[Zeel-Patel]

Sure, let me write a KEP doc first

[googs1025]

/kind feature

[Zeel-Patel]

Overall I think this could be a generic plugin that filters out pod not requesting some specific resource from nodes advertising those resources with except for device-plugin of dra-plugin(in the future).

@PiotrProkop sure, can you provide more info on what you mean by
except fordevice-pluginofdra-plugin(in the future).

[PiotrProkop]

Overall I think this could be a generic plugin that filters out pod not requesting some specific resource from nodes advertising those resources with except for device-plugin of dra-plugin(in the future).

@PiotrProkop sure, can you provide more info on what you mean by except fordevice-pluginofdra-plugin(in the future).

Same idea what this func does:

func containsNvidiaDevicePluginImage(containerList []v1.Container) bool {
	for _, containerItem := range containerList {
		if strings.Contains(containerItem.Image, devicePluginContainerImage) {
			return true
		}
	}
	return false
}

make this filter plugin not fail device-plugins that provides given resource for other pods :)

[ffromani]

/cc

+1 for having a design document/KEP
I'm interested in this topic

[ffromani]

Overall I think this could be a generic plugin that filters out pod not requesting some specific resource from nodes advertising those resources with except for device-plugin of dra-plugin(in the future).

strong agree. It seems there is a easy (and safe?) generalization path for this filter plugin. We can have allowlist/denylist in the plugin.
But I wonder if the same functionality can be achieved using existing scheduling tools. On top of my head: taints/tolerations? What extra value a filter plugin will bring?

[Zeel-Patel]

@PiotrProkop @googs1025 @zwpaper @ffromani
#812

Here is the PR with the KEP doc