vim /lib/systemd/system/docker.service
ExecStart=/usr/bin/dockerd -H fd:// --registry-mirror=https://3hn88wev.mirror.aliyuncs.com
systemctl daemon-reload
systemctl restart docker.service
# 阿里云
sed -i \'s@ExecStart.*@ExecStart=/usr/bin/dockerd --registry-mirror=https://3hn88wev.mirror.aliyuncs.com @g\' /lib/systemd/system/docker.service
# 网易
--registry-mirror=http://hub-mirror.c.163.com
# ustc
--registry-mirror=https://docker.mirrors.ustc.edu.cn
# docker cn
--registry-mirror=https://registry.docker-cn.com
CENTOS: /etc/sysconfig/docker
UBUNTU: /etc/default/docker