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https://github.com/k3s-io/kubernetes.git
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117 lines
3.9 KiB
Go
117 lines
3.9 KiB
Go
/*
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Copyright 2016 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 kubelet
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import (
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"sort"
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"k8s.io/apimachinery/pkg/util/wait"
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"k8s.io/klog/v2"
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kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
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)
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const (
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// The limit on the number of buffered container deletion requests
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// This number is a bit arbitrary and may be adjusted in the future.
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containerDeletorBufferLimit = 50
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)
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type containerStatusbyCreatedList []*kubecontainer.Status
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type podContainerDeletor struct {
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worker chan<- kubecontainer.ContainerID
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containersToKeep int
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}
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func (a containerStatusbyCreatedList) Len() int { return len(a) }
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func (a containerStatusbyCreatedList) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
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func (a containerStatusbyCreatedList) Less(i, j int) bool {
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return a[i].CreatedAt.After(a[j].CreatedAt)
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}
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func newPodContainerDeletor(runtime kubecontainer.Runtime, containersToKeep int) *podContainerDeletor {
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buffer := make(chan kubecontainer.ContainerID, containerDeletorBufferLimit)
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go wait.Until(func() {
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for {
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id := <-buffer
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if err := runtime.DeleteContainer(id); err != nil {
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klog.InfoS("DeleteContainer returned error", "containerID", id, "err", err)
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}
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}
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}, 0, wait.NeverStop)
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return &podContainerDeletor{
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worker: buffer,
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containersToKeep: containersToKeep,
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}
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}
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// getContainersToDeleteInPod returns the exited containers in a pod whose name matches the name inferred from filterContainerId (if not empty), ordered by the creation time from the latest to the earliest.
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// If filterContainerID is empty, all dead containers in the pod are returned.
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func getContainersToDeleteInPod(filterContainerID string, podStatus *kubecontainer.PodStatus, containersToKeep int) containerStatusbyCreatedList {
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matchedContainer := func(filterContainerId string, podStatus *kubecontainer.PodStatus) *kubecontainer.Status {
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if filterContainerId == "" {
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return nil
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}
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for _, containerStatus := range podStatus.ContainerStatuses {
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if containerStatus.ID.ID == filterContainerId {
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return containerStatus
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}
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}
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return nil
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}(filterContainerID, podStatus)
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if filterContainerID != "" && matchedContainer == nil {
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klog.InfoS("Container not found in pod's containers", "containerID", filterContainerID)
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return containerStatusbyCreatedList{}
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}
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// Find the exited containers whose name matches the name of the container with id being filterContainerId
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var candidates containerStatusbyCreatedList
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for _, containerStatus := range podStatus.ContainerStatuses {
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if containerStatus.State != kubecontainer.ContainerStateExited {
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continue
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}
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if matchedContainer == nil || matchedContainer.Name == containerStatus.Name {
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candidates = append(candidates, containerStatus)
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}
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}
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if len(candidates) <= containersToKeep {
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return containerStatusbyCreatedList{}
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}
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sort.Sort(candidates)
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return candidates[containersToKeep:]
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}
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// deleteContainersInPod issues container deletion requests for containers selected by getContainersToDeleteInPod.
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func (p *podContainerDeletor) deleteContainersInPod(filterContainerID string, podStatus *kubecontainer.PodStatus, removeAll bool) {
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containersToKeep := p.containersToKeep
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if removeAll {
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containersToKeep = 0
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filterContainerID = ""
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}
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for _, candidate := range getContainersToDeleteInPod(filterContainerID, podStatus, containersToKeep) {
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select {
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case p.worker <- candidate.ID:
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default:
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klog.InfoS("Failed to issue the request to remove container", "containerID", candidate.ID)
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}
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}
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}
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