Docker daemon enable remote access

nano /lib/systemd/system/docker.service

and change

ExecStart=/usr/bin/dockerd -H fd:// -H tcp://0.0.0.0:2375 [...]

and restart docker with:

systemctl daemon-reload
service docker restart

tested on:

Distributor ID: Ubuntu
Description: Ubuntu 17.10
Release: 17.10
Codename: artful
Distributor ID: Ubuntu
Description: Ubuntu 16.04.4 LTS
Release: 16.04
Codename: xenial

Anton Bracke