docker 拉取不到镜像的问题：拉取超时

 如果每次拉取的时候遇到超时

error pulling image configuration: download failed after attempts=6: dial tcp 31.13.94.10:443: i/o timeout

解决方法如下：

设置国内镜像源：

sudo mkdir -p /etc/docker

然后

sudo gedit /etc/docker/daemon.json
或者
sudo nano /etc/docker/daemon.json
或者
sudo vim /etc/docker/daemon.json

在文件里面写入：

{
"register-mirrors": ["https://ox288s4f.mirror.aliyuncs.com","https://registry.docker-cn.com","http://hub-mirror.c.163.com","https://mirror.ccs.tencentyun.com"]
}

写入之后执行命令

sudo systemctl daemon-reload
sudo systemctl restart docker或者sudo service docker restart

再拉取就快了