k8s镜像源

registry.k8s.io:

mirrors.sjtug.sjtu.edu.cn/registry.k8s.io 
registry-k8s-io.mirrors.sjtug.sjtu.edu.cn

mirrors.sjtug.sjtu.edu.cn/k8s.gcr.io 
k8s-gcr-io.mirrors.sjtug.sjtu.edu.cn

registry.cn-hangzhou.aliyuncs.com/google_containers