Can't speak for gp, but we're using supervisor inside Docker containers as lightweight init process. In our case the main advantage of Docker containers is ease

Can't speak for gp, but we're using supervisor inside Docker containers as lightweight init process. In our case the main advantage of Docker containers is ease of installation and consistent environment - so we don't always use just one process per container. Systemd on the other hand is just something that is being forced down our throats. :-/