错误信息:Get https://registry-1.docker.io/v2/: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)

• 原因是Docker默认镜像源是国外的，修改镜像源为国内的;
  解决办法:

1. vim /etc/docker/daemon.json
2. 新增 {“registry-mirrors”:[“http://hub-mirror.c.163.com”] }
   
3. 重启Docker服务，systemctl restart docker.service

问题解决，成功拉去到资源!