mirror of https://github.com/k3s-io/k3s
105 lines
3.6 KiB
Go
105 lines
3.6 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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"github.com/golang/glog"
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kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
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"k8s.io/kubernetes/pkg/util/wait"
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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.ContainerStatus
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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 { return a[i].CreatedAt.After(a[j].CreatedAt) }
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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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select {
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case id := <-buffer:
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runtime.DeleteContainer(id)
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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 exitedContainerID, ordered by the creation time from the latest to the earliest.
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func (p *podContainerDeletor) getContainersToDeleteInPod(exitedContainerID string, podStatus *kubecontainer.PodStatus) containerStatusbyCreatedList {
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var matchedContainer *kubecontainer.ContainerStatus
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var exitedContainers []*kubecontainer.ContainerStatus
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// Find all exited containers in the pod
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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 containerStatus.ID.ID == exitedContainerID {
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matchedContainer = containerStatus
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}
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exitedContainers = append(exitedContainers, containerStatus)
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}
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if matchedContainer == nil {
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glog.Warningf("Container %q not found in pod's exited containers", exitedContainerID)
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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 exitedContainerID
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var candidates containerStatusbyCreatedList
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for _, containerStatus := range exitedContainers {
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if 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) <= p.containersToKeep {
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return containerStatusbyCreatedList{}
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}
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sort.Sort(candidates)
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return candidates[p.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(exitedContainerID string, podStatus *kubecontainer.PodStatus) {
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for _, candidate := range p.getContainersToDeleteInPod(exitedContainerID, podStatus) {
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select {
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case p.worker <- candidate.ID:
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default:
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glog.Warningf("Failed to issue the request to remove container %v", candidate.ID)
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}
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}
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}
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