***The Docker daemon always runs as the root user.
If you don’t want to preface the docker command with sudo,
create a Unix group called docker and add users to it.
When the Docker daemon starts, it creates a Unix socket
accessible by members of the docker group. ***

### Create the docker group ###

$ sudo groupadd docker

### Add your user to the docker group ###

$ sudo usermod -aG docker $USER

### Log out and log back in so that your group membership is re-evaluated ###
### Verify that you can run docker commands without sudo ###

$ docker run hello-world