环境变量：
/var/lib/kubelet/kubeadm-flags.env
KUBELET_KUBEADM_ARGS="--cgroup-driver=systemd --network-plugin=cni --pod-infra-container-image=registry.aliyuncs.com/google_containers/pause:3.2"
kubelet
原文：https://www.cnblogs.com/timlong/p/13359523.html
