71 lines
2.5 KiB
Go
71 lines
2.5 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 nodeunschedulable
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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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v1helper "k8s.io/kubernetes/pkg/apis/core/v1/helper"
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framework "k8s.io/kubernetes/pkg/scheduler/framework/v1alpha1"
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)
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// NodeUnschedulable is a plugin that priorities nodes according to the node annotation
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// "scheduler.alpha.kubernetes.io/preferAvoidPods".
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type NodeUnschedulable struct {
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}
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var _ framework.FilterPlugin = &NodeUnschedulable{}
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// Name is the name of the plugin used in the plugin registry and configurations.
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const Name = "NodeUnschedulable"
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const (
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// ErrReasonUnknownCondition is used for NodeUnknownCondition predicate error.
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ErrReasonUnknownCondition = "node(s) had unknown conditions"
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// ErrReasonUnschedulable is used for NodeUnschedulable predicate error.
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ErrReasonUnschedulable = "node(s) were unschedulable"
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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 *NodeUnschedulable) 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 *NodeUnschedulable) Filter(ctx context.Context, _ *framework.CycleState, pod *v1.Pod, nodeInfo *framework.NodeInfo) *framework.Status {
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if nodeInfo == nil || nodeInfo.Node() == nil {
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return framework.NewStatus(framework.UnschedulableAndUnresolvable, ErrReasonUnknownCondition)
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}
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// If pod tolerate unschedulable taint, it's also tolerate `node.Spec.Unschedulable`.
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podToleratesUnschedulable := v1helper.TolerationsTolerateTaint(pod.Spec.Tolerations, &v1.Taint{
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Key: v1.TaintNodeUnschedulable,
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Effect: v1.TaintEffectNoSchedule,
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})
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// TODO (k82cn): deprecates `node.Spec.Unschedulable` in 1.13.
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if nodeInfo.Node().Spec.Unschedulable && !podToleratesUnschedulable {
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return framework.NewStatus(framework.UnschedulableAndUnresolvable, ErrReasonUnschedulable)
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}
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return nil
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}
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// New initializes a new plugin and returns it.
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func New(_ runtime.Object, _ framework.FrameworkHandle) (framework.Plugin, error) {
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return &NodeUnschedulable{}, nil
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}
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