kubectl get nodes
systemctl daemon-reload
systemctl restart docker
systemctl enable kubelet && systemctl start kubelet

kubeadm reset

sudo docker pull calico/cni:v3.9.2
sudo docker pull calico/cni:v3.9.2

cat <<EOF >  /etc/docker/daemon.json
{
  "registry-mirrors": ["https://uy35zvn6.mirror.aliyuncs.com",
                    "https://b9pmyelo.mirror.aliyuncs.com",
                        "https://ustc-edu-cn.mirror.aliyuncs.com/",
                        "https://ccr.ccs.tencentyun.com/",
                        "https://docker.m.daocloud.io/"],
  "exec-opts": ["native.cgroupdriver=systemd"]
}
EOF