現象：
[root@master cluster]# kubeadm init --config=kubeadm.yml --experimental-upload-certs|tee kubeadm=init.log unknown flag: --experimental-upload-certs To see the stack trace of this error execute with --v=5 or higher
之前版本為v1.4.0時該命令正常執行
解決辦法: 將–experimental-upload-certs 替換為 --upload-certs
kubeadm init --config=kubeadm.yml --upload-certs | tee kubeadm-init.log
