this change for china mainland docker users.

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# create docker user config dir
sudo mkdir -p /etc/docker

# touch docker config file
sudo tee /etc/docker/daemon.json <<-'EOF'
{
    "registry-mirrors": [
        "https://1nj0zren.mirror.aliyuncs.com",
        "https://docker.mirrors.ustc.edu.cn",
        "http://f1361db2.m.daocloud.io",
        "https://registry.docker-cn.com"
    ]
}
EOF

# reload and restart docker
sudo systemctl daemon-reload
sudo systemctl restart docker