Docker: Enable API
From wiki.jacobjohns.com

Enable Docker API
- Edit the docker.service:
sudo systemctl edit docker.service- Add the below above the '### Lines below this comment will be discarded line':
[Service] ExecStart= ExecStart=/usr/bin/dockerd
2. Create /etc/docker/daemon.json with the below:
{
"hosts": ["unix:///var/run/docker.sock", "tcp://<HostIP>:2375"]
}
3.Restart docker: systemctl restart docker
