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https://github.com/optim-enterprises-bv/kubernetes.git
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90 lines
3.3 KiB
Go
90 lines
3.3 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package nodename
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import (
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"context"
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v1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/kubernetes/pkg/scheduler/framework"
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"k8s.io/kubernetes/pkg/scheduler/framework/plugins/feature"
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"k8s.io/kubernetes/pkg/scheduler/framework/plugins/names"
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)
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// NodeName is a plugin that checks if a pod spec node name matches the current node.
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type NodeName struct {
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enableSchedulingQueueHint bool
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}
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var _ framework.FilterPlugin = &NodeName{}
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var _ framework.EnqueueExtensions = &NodeName{}
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const (
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// Name is the name of the plugin used in the plugin registry and configurations.
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Name = names.NodeName
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// ErrReason returned when node name doesn't match.
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ErrReason = "node(s) didn't match the requested node name"
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)
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// EventsToRegister returns the possible events that may make a Pod
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// failed by this plugin schedulable.
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func (pl *NodeName) EventsToRegister(_ context.Context) ([]framework.ClusterEventWithHint, error) {
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// A note about UpdateNodeTaint/UpdateNodeLabel event:
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// Ideally, it's supposed to register only Add because any Node update event will never change the result from this plugin.
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// But, we may miss Node/Add event due to preCheck, and we decided to register UpdateNodeTaint | UpdateNodeLabel for all plugins registering Node/Add.
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// See: https://github.com/kubernetes/kubernetes/issues/109437
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nodeActionType := framework.Add | framework.UpdateNodeTaint | framework.UpdateNodeLabel
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if pl.enableSchedulingQueueHint {
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// preCheck is not used when QHint is enabled, and hence Update event isn't necessary.
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nodeActionType = framework.Add
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}
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return []framework.ClusterEventWithHint{
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// We don't need the QueueingHintFn here because the scheduling of Pods will be always retried with backoff when this Event happens.
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// (the same as Queue)
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{Event: framework.ClusterEvent{Resource: framework.Node, ActionType: nodeActionType}},
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}, nil
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}
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// Name returns name of the plugin. It is used in logs, etc.
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func (pl *NodeName) Name() string {
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return Name
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}
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// Filter invoked at the filter extension point.
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func (pl *NodeName) Filter(ctx context.Context, _ *framework.CycleState, pod *v1.Pod, nodeInfo *framework.NodeInfo) *framework.Status {
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if !Fits(pod, nodeInfo) {
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return framework.NewStatus(framework.UnschedulableAndUnresolvable, ErrReason)
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}
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return nil
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}
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// Fits actually checks if the pod fits the node.
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func Fits(pod *v1.Pod, nodeInfo *framework.NodeInfo) bool {
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return len(pod.Spec.NodeName) == 0 || pod.Spec.NodeName == nodeInfo.Node().Name
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}
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// New initializes a new plugin and returns it.
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func New(_ context.Context, _ runtime.Object, _ framework.Handle, fts feature.Features) (framework.Plugin, error) {
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return &NodeName{
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enableSchedulingQueueHint: fts.EnableSchedulingQueueHint,
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}, nil
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}
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