The solution is to use docker run --init to run an init process as PID 1, that will take care of propagating the signals to the other processes, it is safe enough to be used basically always.

If you are using Docker 1.13 or greater, Tini is included in Docker itself. This includes all versions of Docker CE. To enable Tini, just pass the --init flag to docker run.

Good question! This is going to be a bit long, so bear with me