1、 kubelet 启动 报 unable to load bootstrap kubeconfig: stat /etc/kubernetes/bootstrap-kubelet.conf: no such file or directory" ，原因是kubelet.conf的证书权限有问题
2、处理方法
拷贝 admin.conf 到 kubelet.conf ，再重新启动kubelet服务
cp -a /etc/kubernetes/admin.conf /etc/kubernetes/kubelet.conf
systemctl daemon-reload && systemctl restart kubelet
