The easiest is to use the provider docker-compose file:
docker-compose up
Otherwise, use the containers you need: freqout/streammachine-master and freqout/streammachine-slave
The provided example uses the /live mountpoint, using the live password.
Use something like NiceCast or Airtime to stream to it on port 8000.
Listen to the normal machine's HTTP port (80) (http://localhost/live). Use the rewind buffer to listen to 300 seconds behind: http://localhost/live?offset=300
make streammachine
make streammachine-master
make streammachine-slave