Any persistent storage like database or wallet information would be stored in a volume (dir on host machine) that user defines while calling `docker run jelectrum --volume /home/user/electrumdb:/var/... --volume /home/user/electrumwallet:/var/...`, this isolates data from the application. Aside from that you need to write plaintext dockerfile which is basically a set of shell commands that produces environment ready to operate. Important that then need to be non-prompt commands. You don't need to start from scratch, using `FROM java...` will use build your docker image on top of another one. Good examples here: https://github.com/dockerfile/java At the end you need expose expected ports and start your app, ensure it won't be closed because when that process closes, the docker image will stop.