linux登陆阿里云镜像仓库报错：Error response from daemon: Get https

最近在学习docker，注册了阿里云镜像仓库。在阿里云主机上登陆好好的，但在win上安装的虚拟机（CentOS7）上却一直无法登陆，报错如下：
Error response from daemon: Get https://registry.cn-shenzhen.... net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)

网上参考了很多文章，最后看到一篇，说把dns改为8.8.8.8，试了试，果然疗效显著：

vim /etc/resolv.conf