Docker daemon and Ubuntu 16.04 with systemd

Some changes in Ubuntu distribution could impact to docker daemon settings on boot and one of that regards the options in /etc/default/docker. After many test I realize that, the file is read (the syntax must be correct) but the content is ignored.

After searching in official docs ( https://docs.docker.com/engine/admin/systemd/ ) I realize that systemd recognize only options written in /lib/systemd/system/docker.service file.

Here is the my modified config file:

That’s all!