Files used in Docker demo here: https://youtu.be/MncPj2ZHnD0

Dockerfile

FROM alpine:latest

COPY writer.sh .

CMD ["/writer.sh"]

STEPS.md

Steps to re-create

1. docker build -t volume-tester .
2. mkdir tmpvolume
3. docker run -d -it --name voltest --mount type=bind,source="$(pwd)"/tmpvolume,target=/app --rm volume-tester:latest
4. ls tmpvolume
5. cat tmpvolume/*

Watch Video

Not in video but the container is gone at this point with the --rm flag but data persisted.

NOTE: --mount is preferred syntax in later version of Docker for bind mounts but the following would also work with the --volume or -v flags.

docker run -d -it --name voltest -v "$(pwd)"/tmpvolume:/app --rm volume-tester:latest

writer.sh

#!/bin/sh
cd /app
touch tester.txt
echo "TESTING TESTING" > tester.txt
echo "I EXIST" > /app/proof.txt