新建 /etc/systemd/system/docker-tcp.socket 文件

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[Unit]
Description=Docker Socket for the API

[Socket]
# ListenStream=127.0.0.1:2375
ListenStream=2375
BindIPv6Only=both
Service=docker.service

[Install]
WantedBy=sockets.target

重新启动服务

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sudo systemctl daemon-reload
sudo systemctl enable docker-tcp.socket
sudo systemctl stop docker
sudo systemctl start docker-tcp.socket
sudo systemctl start docker

注意：这种方法必须先启动 docker-tcp.socket，再启动 Docker，一定要注意启动顺序！