# Docker's systemd unit specifies `-H fd://` on ExecStart by default, which conflicts with # setting `hosts` in daemon.json ("specified both as a flag and in the configuration file"). # This override clears ExecStart and re-specifies it with no -H flag, letting daemon.json's # `hosts` list be the only source of truth — the documented fix for this exact conflict. [Service] ExecStart= ExecStart=/usr/bin/dockerd