Comment 7 for bug 1856493

(venv3) root@ss:~/kolla-ansible_setup# journalctl -fu docker
-- Logs begin at Tue 2019-11-26 23:06:42 UTC. --
Dec 16 10:55:57 ss dockerd[5615]: unable to configure the Docker daemon with file /etc/docker/daemon.json: the following directives are specified both as a flag and in the configuration file: log-opts: (from flag: map[max-file:5 max-size:50m], from file: map[max-file:5 max-size:50m])
Dec 16 10:55:57 ss systemd[1]: docker.service: Main process exited, code=exited, status=1/FAILURE
Dec 16 10:55:57 ss systemd[1]: docker.service: Failed with result 'exit-code'.
Dec 16 10:55:57 ss systemd[1]: Failed to start Docker Application Container Engine.
Dec 16 10:55:59 ss systemd[1]: docker.service: Service hold-off time over, scheduling restart.
Dec 16 10:55:59 ss systemd[1]: docker.service: Scheduled restart job, restart counter is at 3.
Dec 16 10:55:59 ss systemd[1]: Stopped Docker Application Container Engine.
Dec 16 10:55:59 ss systemd[1]: docker.service: Start request repeated too quickly.
Dec 16 10:55:59 ss systemd[1]: docker.service: Failed with result 'exit-code'.
Dec 16 10:55:59 ss systemd[1]: Failed to start Docker Application Container Engine.