Debian image – /sbin/init not found

I am trying to start a Debian image with the /sbin/init process for ansible role testing via molecule.

Yes, I am aware, that one should not start /sbin/init in a container unless you really have a use case for doing so. With molecule I can test my ansible roles in a docker container. As such I need /sbin/init running.

When I execute

docker run -it --privileged -v /sys/fs/cgroup:/sys/fs/cgroup:ro debian:9 /sbin/init

docker: Error response from daemon: OCI runtime create failed: container_linux.go:346:
starting container process caused "exec: "/sbin/init": stat /sbin/init: no such file 
or directory": unknown.

However, with debian:8 it works just fine.

docker run -it --privileged -v /sys/fs/cgroup:/sys/fs/cgroup:ro debian:8 /sbin/init

works like a charm.

Has Debian switched to a new boot process? What changed?

Source: StackOverflow