# Guided Exercise: Predict What Survives Before You Test It

This is a paper exercise — commit to predictions before working in the Lab.

## Your task

For each scenario, predict whether the data survives a `docker rm -f` followed by recreating a
container with the same name and image:

1. Data written to `/tmp/file.txt` inside a container with no volumes configured.
2. Data written to `/data/file.txt`, where `/data` is mounted from a named volume.
3. Data written to `/data/file.txt` in scenario 2, but this time you ALSO run
   `docker volume rm <the-volume>` before recreating the container.

## A worked shape to check yourself against

1. Lost — no volume, so it lived only in the disposable writable layer.
2. Survives — the volume itself is untouched by the container's destruction, and the new
   container reattaches to the same volume.
3. Lost — the volume itself was explicitly deleted, not just the container. Persistence depends
   on the VOLUME surviving, not just avoiding container destruction.

## Instructor Notes

**Facilitation:** Item 3 is the important trick question — students who've internalized
"volumes always persist" without qualification should be corrected here: the volume itself can
still be deleted deliberately.

**Approximate timing:** 8-10 minutes live discussion; 5 minutes self-paced.