Docker not working as intended

The BiBiGrid master 'ubuntu' user on my cluster was not part of the 'docker' group.

Executing docker commands got me "permission denied" errors.

Workers seem to be part of the docker group, I can execute docker run hello-world without sudo.

Executing docker commands on a worker via slurm on the other hand throws a:

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?name=nxf-vcIfko5wKNS5o6fx0ig072dG": dial unix /var/run/docker.sock: connect: permission denied.