发现镜像失效了，docker pull一直下载不下来，记录一下解决方案

参考https://docs.docker.com/config/daemon/systemd/#httphttps-proxy

1. 新建文件夹

   sudo mkdir -p /etc/systemd/system/docker.service.d

2. 创建文件/etc/systemd/system/docker.service.d/http-proxy.conf

   将文中的http://proxy.example.com:3128 替换为自己的代理，如clash-> http://ip:7890

   [Service]
   Environment="HTTP_PROXY=http://ip:7890"
   Environment="HTTPS_PROXY=http://ip:7890"

3. 刷新重启docker

   sudo systemctl daemon-reload
   sudo systemctl restart docker

4. 测试是否成功

   sudo systemctl show --property=Environment docker