问题集：
问题：unable to get URL "https://dl.k8s.io/release/stable-1.11.txt": Get https://storage.googleapis.com/kubernetes-release/release/stable-1.11.txt: dial tcp 216.58.220.208:443: connect: connection refused
回答：--kubernetes-version 最好指定版本，否则会请求 https://storage.googleapis.com/kubernetes-release/release/stable-1.9.txt ，如果没"翻""墙"，就超时报错