k8s CreateAndInitKUbelet

birthcry()

----集创建好kubelete后，发出的第一条event消息到所有watcher,告诉watcher Starting kubelet

kl.recorder.Eventf(kl.nodeRef, v1.EventTypeNormal, events.StartingKubelet, "Starting kubelet.")

------然后启动垃圾手机清理程序

k.StartGarbageCollection()

(1) kl.containerGC.GarbageCollect()清理docker,删除超时和无用的docker

(2)imageManager.GarbageCollect()清理存储空间，满足小于设置的阈值。根据时间戳阈值来判断是否删除镜像。

err := im.runtime.RemoveImage(container.ImageSpec{Image: image.id})
if err != nil {
   deletionErrors = append(deletionErrors, err)
   continue
}
delete(im.imageRecords, image.id)
spaceFreed += image.size