Run Docker commands without sudo

1. Add the docker group if it doesn’t already exist

$ sudo groupadd docker

2. Add the connected user $USER to the docker group

Optionally change the username to match your preferred user.

$ sudo gpasswd -a $USER docker

IMPORTANT: Log out and log back in so that your group membership is re-evaluated.

3. Restart the docker daemon

$ sudo service docker restart

If you are on Ubuntu 14.04-15.10, use docker.io instead:

$ sudo service docker.io restart

sudo reboot