root@mypi:~# exit
logout
$ which docker
/usr/bin/docker
$ docker info
Client:
...

Server:
ERROR: permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get "http://%2Fvar%2Frun%2Fdocker.sock/v1.24/info": dial unix /var/run/docker.sock: connect: permission denied
errors pretty printing info
$ whoami
pi
$