阿里云的ubuntu服务器，装了Docker，想要在里面pull一个网站的镜像，但是出现网络问题，不能下载

错误提示有：

1Get https://registry-1.docker.io/v1/repositories/library/owncloud/tags/latest: dial tcp: lookup registry-1.docker.io on 10.242.197.247:53: read udp 10.242.197.247:53: i/o timeout

12Network timed out while trying to connect to https://index.docker.io/v1/repositories/library/owncloud/images. You may want to check your internet connection or if you are behind a proxy.试过vpn和ss，没有用，有谁教一下该怎么弄？