docker pull时经常拉不下来： 

>docker pull gitlab/gitlab-ce:latest 

Error response from daemon: Get "https://registry-1.docker.io/v2/": unable to connect to 162.125.32.13:443. Do you need an HTTP proxy?

这是因为国外的docker.io无法直接访问，这时可以找代理网站，

在这里可以找到可用的代理网站： 

https://docker-mirror.liu12.com/

例如

在docker镜像前面加上代理网址就可以拉下来了： 
 

docker pull docker.m.daocloud.io/gitlab/gitlab-ce:latest
latest: Pulling from gitlab/gitlab-ce
32f112e3802c: Pull complete
9a74e3a79a1e: Pull complete
69139108ee6c: Pull complete
1769d6353899: Pull complete
118091a2d3ba: Pull complete
d8cea3cb1ae4: Pull complete
0af57667fc9f: Pull complete
8d74ed511957: Pull complete
088f0e472763: Downloading [=========>                                         ]  311.5MB/1.723GB