docs: update configuring docker for systemd

Ubuntu 15.04 and above uses systemd. Add a note
in the docs to point users to the right instructions.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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Sebastiaan van Stijn 2016-01-04 15:26:55 +01:00
parent db738dd77f
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@ -85,6 +85,10 @@ You can start/stop/restart the `docker` daemon using
### Configuring Docker
The instructions below depict configuring Docker on a system that uses `upstart`
as the process manager. As of Ubuntu 15.04, Ubuntu uses `systemd` as its process
manager. For Ubuntu 15.04 and higher, refer to [control and configure Docker with systemd](systemd.md).
You configure the `docker` daemon in the `/etc/default/docker` file on your
system. You do this by specifying values in a `DOCKER_OPTS` variable.