Have you seen this error:
docker: Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Post "http://%2Fvar%2Frun%2Fdocker.sock/v1.24/containers/create": dial unix /var/run/docker.sock: connect: permission denied.
See 'docker run --help'.
?
$ sudo groupadd docker
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.
$ sudo service docker restart
If you are on Ubuntu 14.04-15.10, use docker.io
instead:
$ sudo service docker.io restart