alpine and s6 in a container
s6 is used as an init system to handle signals so that docker stop and
kill -s TERM properly shutdown the container. It is not used to run multiple
processes.
- ENV is propagated correctly
- stdout/stderr is propagated correctly
docker build -t signals .
docker run --name signals signals
docker stop signals
To use this as a template for building an image, edit s6/service/run to call
the command.