Open Port 2375 for Docker API

Create  daemon.json  file in  /etc/docker : 

 {"hosts": ["tcp://0.0.0.0:2375", "unix:///var/run/docker.sock"]} 

 

 

 Add  /etc/systemd/system/docker.service.d/override.conf 

 [Service]

 ExecStart=

 ExecStart=/usr/bin/dockerd 

 

 

 Reload the systemd daemon: 

 systemctl daemon-reload 

 

 

 Restart docker: 

 systemctl restart docker.service 

 

 firewall 

 

 ufw allow 2375/tcp

ufw reload