[docker without sudo]

sudoless-docker.sh

#!/usr/bin/env bash

# 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