Error response from daemon: Get https://registry-1.docker.io/v2/

连接Docker Hub失败的问题时，首先确认自己主机可以访问registry-1.docker.io：

ping registry-1.docker.io
curl -v https://registry-1.docker.io/v2/

若不通：检查网络配置， 设置镜像加速  参考 https://cloud.tencent.cn/developer/article/2485043

sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<EOF
{"registry-mirrors": ["https://docker.1ms.run","https://docker.xuanyuan.me"]
}
EOF
sudo systemctl daemon-reload
sudo systemctl restart docker

然后就能顺利拉取镜像啦