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