Error when starting Docker daemon with user other than root (permission denied)

Question

I want to start the Docker daemon with a user other than root.

I'm trying to start it with docker daemon --host=unix:///var/run/docker.sock --host=tcp://0.0.0.0:2375 --storage-driver=vfs .

Sadly this error occurs:

FATA[0000] Error starting daemon: open /var/run/docker.pid: permission denied

When I look into the directory /var/run/ I can't see any file named docker.pid .

Starting the service as root works without problems.

Answer 1

The Docker daemon must run as root.

Edit: https://docs.docker.com/engine/security/security/#/docker-daemon-attack-surface