进入到/lib/systemd/system/docker.service
vim /lib/systemd/system/docker.service找到ExecStart行，修改成下边这样
ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock配置生效
docker daemon-reload重启docker
systemctl restart docker进入到/lib/systemd/system/docker.service
vim /lib/systemd/system/docker.service找到ExecStart行，修改成下边这样
ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock配置生效
docker daemon-reload重启docker
systemctl restart docker