119 lines
4.5 KiB
Go
119 lines
4.5 KiB
Go
/*
|
|
Copyright 2019 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package nodelabel
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
|
|
v1 "k8s.io/api/core/v1"
|
|
"k8s.io/apimachinery/pkg/runtime"
|
|
"k8s.io/kubernetes/pkg/scheduler/algorithm/predicates"
|
|
"k8s.io/kubernetes/pkg/scheduler/algorithm/priorities"
|
|
"k8s.io/kubernetes/pkg/scheduler/framework/plugins/migration"
|
|
framework "k8s.io/kubernetes/pkg/scheduler/framework/v1alpha1"
|
|
"k8s.io/kubernetes/pkg/scheduler/nodeinfo"
|
|
)
|
|
|
|
// Name of this plugin.
|
|
const Name = "NodeLabel"
|
|
|
|
// Args holds the args that are used to configure the plugin.
|
|
type Args struct {
|
|
// PresentLabels should be present for the node to be considered a fit for hosting the pod
|
|
PresentLabels []string `json:"presentLabels,omitempty"`
|
|
// AbsentLabels should be absent for the node to be considered a fit for hosting the pod
|
|
AbsentLabels []string `json:"absentLabels,omitempty"`
|
|
// Nodes that have labels in the list will get a higher score.
|
|
PresentLabelsPreference []string `json:"presentLabelsPreference,omitempty"`
|
|
// Nodes that don't have labels in the list will get a higher score.
|
|
AbsentLabelsPreference []string `json:"absentLabelsPreference,omitempty"`
|
|
}
|
|
|
|
// validateArgs validates that presentLabels and absentLabels do not conflict.
|
|
func validateNoConflict(presentLabels []string, absentLabels []string) error {
|
|
m := make(map[string]struct{}, len(presentLabels))
|
|
for _, l := range presentLabels {
|
|
m[l] = struct{}{}
|
|
}
|
|
for _, l := range absentLabels {
|
|
if _, ok := m[l]; ok {
|
|
return fmt.Errorf("detecting at least one label (e.g., %q) that exist in both the present(%+v) and absent(%+v) label list", l, presentLabels, absentLabels)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// New initializes a new plugin and returns it.
|
|
func New(plArgs *runtime.Unknown, handle framework.FrameworkHandle) (framework.Plugin, error) {
|
|
args := &Args{}
|
|
if err := framework.DecodeInto(plArgs, args); err != nil {
|
|
return nil, err
|
|
}
|
|
if err := validateNoConflict(args.PresentLabels, args.AbsentLabels); err != nil {
|
|
return nil, err
|
|
}
|
|
if err := validateNoConflict(args.PresentLabelsPreference, args.AbsentLabelsPreference); err != nil {
|
|
return nil, err
|
|
}
|
|
// Note that the reduce function is always nil therefore it's ignored.
|
|
prioritize, _ := priorities.NewNodeLabelPriority(args.PresentLabelsPreference, args.AbsentLabelsPreference)
|
|
return &NodeLabel{
|
|
handle: handle,
|
|
predicate: predicates.NewNodeLabelPredicate(args.PresentLabels, args.AbsentLabels),
|
|
prioritize: prioritize,
|
|
}, nil
|
|
}
|
|
|
|
// NodeLabel checks whether a pod can fit based on the node labels which match a filter that it requests.
|
|
type NodeLabel struct {
|
|
handle framework.FrameworkHandle
|
|
predicate predicates.FitPredicate
|
|
prioritize priorities.PriorityMapFunction
|
|
}
|
|
|
|
var _ framework.FilterPlugin = &NodeLabel{}
|
|
var _ framework.ScorePlugin = &NodeLabel{}
|
|
|
|
// Name returns name of the plugin. It is used in logs, etc.
|
|
func (pl *NodeLabel) Name() string {
|
|
return Name
|
|
}
|
|
|
|
// Filter invoked at the filter extension point.
|
|
func (pl *NodeLabel) Filter(ctx context.Context, _ *framework.CycleState, pod *v1.Pod, nodeInfo *nodeinfo.NodeInfo) *framework.Status {
|
|
// Note that NodeLabelPredicate doesn't use predicate metadata, hence passing nil here.
|
|
_, reasons, err := pl.predicate(pod, nil, nodeInfo)
|
|
return migration.PredicateResultToFrameworkStatus(reasons, err)
|
|
}
|
|
|
|
// Score invoked at the score extension point.
|
|
func (pl *NodeLabel) Score(ctx context.Context, state *framework.CycleState, pod *v1.Pod, nodeName string) (int64, *framework.Status) {
|
|
nodeInfo, err := pl.handle.SnapshotSharedLister().NodeInfos().Get(nodeName)
|
|
if err != nil {
|
|
return 0, framework.NewStatus(framework.Error, fmt.Sprintf("getting node %q from Snapshot: %v", nodeName, err))
|
|
}
|
|
// Note that node label priority function doesn't use metadata, hence passing nil here.
|
|
s, err := pl.prioritize(pod, nil, nodeInfo)
|
|
return s.Score, migration.ErrorToFrameworkStatus(err)
|
|
}
|
|
|
|
// ScoreExtensions of the Score plugin.
|
|
func (pl *NodeLabel) ScoreExtensions() framework.ScoreExtensions {
|
|
return nil
|
|
}
|