Failed to get system container stats、failed to get cgroup stats

Failed to get system container stats for “/system.slice/docker.service”: failed to get cgroup stats for “/system.slice/docker.service”: failed to get cgroup stats for “/system.slice/docker.service”: failed to get container info for “/system.slice/docker.service”: unknown container “/system.slice/docker.service”

参考：Stackoverflow

这个问题大概就是因为 kubelet 在 docker 之前就启动了。