138 lines
4.4 KiB
Go
138 lines
4.4 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 nodelabel
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import (
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"context"
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"fmt"
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v1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/kubernetes/pkg/scheduler/apis/config"
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"k8s.io/kubernetes/pkg/scheduler/apis/config/validation"
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framework "k8s.io/kubernetes/pkg/scheduler/framework/v1alpha1"
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)
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// Name of this plugin.
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const Name = "NodeLabel"
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const (
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// ErrReasonPresenceViolated is used for CheckNodeLabelPresence predicate error.
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ErrReasonPresenceViolated = "node(s) didn't have the requested labels"
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)
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// New initializes a new plugin and returns it.
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func New(plArgs runtime.Object, handle framework.FrameworkHandle) (framework.Plugin, error) {
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args, err := getArgs(plArgs)
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if err != nil {
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return nil, err
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}
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if err := validation.ValidateNodeLabelArgs(args); err != nil {
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return nil, err
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}
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return &NodeLabel{
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handle: handle,
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args: args,
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}, nil
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}
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func getArgs(obj runtime.Object) (config.NodeLabelArgs, error) {
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ptr, ok := obj.(*config.NodeLabelArgs)
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if !ok {
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return config.NodeLabelArgs{}, fmt.Errorf("want args to be of type NodeLabelArgs, got %T", obj)
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}
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return *ptr, nil
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}
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// NodeLabel checks whether a pod can fit based on the node labels which match a filter that it requests.
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type NodeLabel struct {
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handle framework.FrameworkHandle
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args config.NodeLabelArgs
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}
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var _ framework.FilterPlugin = &NodeLabel{}
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var _ framework.ScorePlugin = &NodeLabel{}
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// Name returns name of the plugin. It is used in logs, etc.
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func (pl *NodeLabel) 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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// It checks whether all of the specified labels exists on a node or not, regardless of their value
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//
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// Consider the cases where the nodes are placed in regions/zones/racks and these are identified by labels
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// In some cases, it is required that only nodes that are part of ANY of the defined regions/zones/racks be selected
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//
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// Alternately, eliminating nodes that have a certain label, regardless of value, is also useful
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// A node may have a label with "retiring" as key and the date as the value
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// and it may be desirable to avoid scheduling new pods on this node.
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func (pl *NodeLabel) Filter(ctx context.Context, _ *framework.CycleState, pod *v1.Pod, nodeInfo *framework.NodeInfo) *framework.Status {
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node := nodeInfo.Node()
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if node == nil {
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return framework.NewStatus(framework.Error, "node not found")
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}
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nodeLabels := labels.Set(node.Labels)
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check := func(labels []string, presence bool) bool {
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for _, label := range labels {
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exists := nodeLabels.Has(label)
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if (exists && !presence) || (!exists && presence) {
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return false
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}
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}
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return true
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}
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if check(pl.args.PresentLabels, true) && check(pl.args.AbsentLabels, false) {
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return nil
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}
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return framework.NewStatus(framework.UnschedulableAndUnresolvable, ErrReasonPresenceViolated)
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}
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// Score invoked at the score extension point.
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func (pl *NodeLabel) Score(ctx context.Context, state *framework.CycleState, pod *v1.Pod, nodeName string) (int64, *framework.Status) {
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nodeInfo, err := pl.handle.SnapshotSharedLister().NodeInfos().Get(nodeName)
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if err != nil || nodeInfo.Node() == nil {
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return 0, framework.NewStatus(framework.Error, fmt.Sprintf("getting node %q from Snapshot: %v, node is nil: %v", nodeName, err, nodeInfo.Node() == nil))
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}
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node := nodeInfo.Node()
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score := int64(0)
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for _, label := range pl.args.PresentLabelsPreference {
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if labels.Set(node.Labels).Has(label) {
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score += framework.MaxNodeScore
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}
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}
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for _, label := range pl.args.AbsentLabelsPreference {
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if !labels.Set(node.Labels).Has(label) {
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score += framework.MaxNodeScore
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}
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}
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// Take average score for each label to ensure the score doesn't exceed MaxNodeScore.
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score /= int64(len(pl.args.PresentLabelsPreference) + len(pl.args.AbsentLabelsPreference))
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return score, nil
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}
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// ScoreExtensions of the Score plugin.
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func (pl *NodeLabel) ScoreExtensions() framework.ScoreExtensions {
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return nil
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}
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