107 lines
3.3 KiB
Go
107 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 volumebinding
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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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framework "k8s.io/kubernetes/pkg/scheduler/framework/v1alpha1"
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schedulernodeinfo "k8s.io/kubernetes/pkg/scheduler/nodeinfo"
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"k8s.io/kubernetes/pkg/scheduler/volumebinder"
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)
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// VolumeBinding is a plugin that binds pod volumes in scheduling.
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type VolumeBinding struct {
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binder *volumebinder.VolumeBinder
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}
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var _ framework.FilterPlugin = &VolumeBinding{}
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// Name is the name of the plugin used in Registry and configurations.
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const Name = "VolumeBinding"
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const (
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// ErrReasonBindConflict is used for VolumeBindingNoMatch predicate error.
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ErrReasonBindConflict = "node(s) didn't find available persistent volumes to bind"
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// ErrReasonNodeConflict is used for VolumeNodeAffinityConflict predicate error.
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ErrReasonNodeConflict = "node(s) had volume node affinity conflict"
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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 *VolumeBinding) Name() string {
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return Name
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}
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func podHasPVCs(pod *v1.Pod) bool {
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for _, vol := range pod.Spec.Volumes {
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if vol.PersistentVolumeClaim != nil {
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return true
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}
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}
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return false
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}
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// Filter invoked at the filter extension point.
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// It evaluates if a pod can fit due to the volumes it requests,
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// for both bound and unbound PVCs.
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//
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// For PVCs that are bound, then it checks that the corresponding PV's node affinity is
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// satisfied by the given node.
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//
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// For PVCs that are unbound, it tries to find available PVs that can satisfy the PVC requirements
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// and that the PV node affinity is satisfied by the given node.
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//
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// The predicate returns true if all bound PVCs have compatible PVs with the node, and if all unbound
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// PVCs can be matched with an available and node-compatible PV.
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func (pl *VolumeBinding) Filter(ctx context.Context, cs *framework.CycleState, pod *v1.Pod, nodeInfo *schedulernodeinfo.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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// If pod does not request any PVC, we don't need to do anything.
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if !podHasPVCs(pod) {
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return nil
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}
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unboundSatisfied, boundSatisfied, err := pl.binder.Binder.FindPodVolumes(pod, node)
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if err != nil {
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return framework.NewStatus(framework.Error, err.Error())
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}
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if !boundSatisfied || !unboundSatisfied {
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status := framework.NewStatus(framework.UnschedulableAndUnresolvable)
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if !boundSatisfied {
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status.AppendReason(ErrReasonNodeConflict)
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}
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if !unboundSatisfied {
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status.AppendReason(ErrReasonBindConflict)
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}
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return status
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}
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return nil
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}
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// New initializes a new plugin with volume binder and returns it.
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func New(_ *runtime.Unknown, fh framework.FrameworkHandle) (framework.Plugin, error) {
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return &VolumeBinding{
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binder: fh.VolumeBinder(),
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}, nil
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}
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