允许外部访问docker

$ vim /usr/lib/systemd/system/docker.service
# 添加-H tcp://0.0.0.0:2375 
ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2375 -H fd:// --containerd=/run/containerd/containerd.sock

重新加载配置并重启

systemctl daemon-reload
systemctl restart docker