Thanks for your rapid response, yes I rebooted my server several times, and restarted the docker service several times as well.
I agree that the driver seems to be working fine, but I do reboot server/docker several times, and even more, I deleted the docker image, uninstall the nvidia driver plugin and do it over again step by step following the instruction. Problem still, unsolved.
May it be a problem of docker service itself? Any idea I can get a clean/total reinstall of docker service?