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k8s.io/kubernetes / pkg / scheduler / framework / plugins / volumezone

package volumezone

v1.18.5
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Published: Jun 26, 2020 | License: Apache-2.0 | Module: k8s.io/kubernetes

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Constants

const (
	// Name is the name of the plugin used in the plugin registry and configurations.
	Name = "VolumeZone"

	// ErrReasonConflict is used for NoVolumeZoneConflict predicate error.
	ErrReasonConflict = "node(s) had no available volume zone"
)

func New

func New(_ *runtime.Unknown, handle framework.FrameworkHandle) (framework.Plugin, error)

New initializes a new plugin and returns it.

type VolumeZone

type VolumeZone struct {
	// contains filtered or unexported fields
}

VolumeZone is a plugin that checks volume zone.

func (*VolumeZone) Filter

func (pl *VolumeZone) Filter(ctx context.Context, _ *framework.CycleState, pod *v1.Pod, nodeInfo *nodeinfo.NodeInfo) *framework.Status

Filter invoked at the filter extension point.

It evaluates if a pod can fit due to the volumes it requests, given that some volumes may have zone scheduling constraints. The requirement is that any volume zone-labels must match the equivalent zone-labels on the node. It is OK for the node to have more zone-label constraints (for example, a hypothetical replicated volume might allow region-wide access)

Currently this is only supported with PersistentVolumeClaims, and looks to the labels only on the bound PersistentVolume.

Working with volumes declared inline in the pod specification (i.e. not using a PersistentVolume) is likely to be harder, as it would require determining the zone of a volume during scheduling, and that is likely to require calling out to the cloud provider. It seems that we are moving away from inline volume declarations anyway.

func (*VolumeZone) Name

func (pl *VolumeZone) Name() string

Name returns name of the plugin. It is used in logs, etc.

Documentation was rendered with GOOS=linux and GOARCH=amd64.

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