阿里云镜像加速
使用阿里云提供的镜像加速方法，首先访问阿里云。直接在浏览器上访问aliyun.com，然后有账号的就直接用支付宝扫描登陆就可以了。如果没有账号就自己注册一个。
登陆成功之后，需要点击用户的控制台。
https://wq8pad8y.mirror.aliyuncs.com
sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF'
{
"registry-mirrors": ["https://wq8pad8y.mirror.aliyuncs.com"]
}
EOF
sudo systemctl daemon-reload
sudo systemctl restart docker
[root@gby ~]# docker pull centos
Using default tag: latest
latest: Pulling from library/centos
a1d0c7532777: Pull complete
Digest: sha256:a27fd8080b517143cbbbab9dfb7c8571c40d67d534bbdee55bd6c473f432b177
Status: Downloaded newer image for centos:latest
docker.io/library/centos:latest
[root@gby ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
hello-world latest feb5d9fea6a5 8 months ago 13.3kB
centos latest 5d0da3dc9764 8 months ago 231MB
