> If you mean a scenario where Docker launches systemd, we don't do that. In my view Docker is just a packaging system; each container's pid 1 is the app we're

> If you mean a scenario where Docker launches systemd, we don't do that. In my view Docker is just a packaging system; each container's pid 1 is the app we're deploying. No, systemd is actually capable of running Docker containers directly (even without Docker). I definitely wouldn't recommend running systemd inside a container unless you're using systemd to launch the container (instead of Docker), since Docker doesn't handle init systems very well, whereas systemd has this built-in. Though you can also go with the one-app-process-per-container approach as well with systemd, which also works.