Somebody at debian’s thought, it will be very usefull, if adds the
-H fd://
param to the docker daemon default
To remove it, and use the /etc/docker/daemon.json do this below:
vi /lib/systemd/system/docker.service
mod this line:
ExecStart=/usr/bin/dockerd -H fd://
to
ExecStart=/usr/bin/dockerd
than reload the daemon config
systemctl daemon-reload
and reload the service
/etc/init.d/docker restart