docker pull镜像时报错：
ERROR: error pulling image configuration: Get https://production.cloudflare.docker.com/registry-v2/docker/registry/v2/blobs/sha256/74/748b7f7cd0f6d1508103eac95a5b0579975fea222bdfc26d196a4763d5908923/data?verify=1596786263-Nuk%2FdmzzelgyMdUmZLCGYHD9KaA%3D: Service Unavailable
解决办法：
# sudo vim /etc/resolv.conf
加上圈中的解析后，重启docker就可以成功pull