Always only enable docker.socket and not docker.service. But keep in mind to modify systemd-networkd-wait-online.service

(otherwise you wait 2 minutes for starting docker)

https://unix.stackexchange.com/questions/381448/systemd-networkd-wait-online-failures

sudo systemctl edit systemd-networkd-wait-online.service
# or
sudo SYSTEMD_EDITOR=micro systemctl edit systemd-networkd-wait-online.service

[Service]
ExecStart=
ExecStart=/usr/lib/systemd/systemd-networkd-wait-online --any