# Containers Are Ephemeral — Docker

Source: https://www.geekswithgeeks.com/en/docker/docker-ephemeral-containers

> Data written inside a container's writable layer disappears when the container is removed.

## Nothing survives docker rm

A container's own filesystem is temporary. If a database writes its files inside the container and you `docker rm` it, that data is **gone forever** — this is by design.

**Quiz:** What happens to data written inside a container's writable layer after `docker rm`?

- [ ] It's automatically backed up
- [x] It's permanently lost
- [ ] It moves to the next container

*Answer:* It's permanently lost. Without a volume or bind mount, data lives only in the container's writable layer and is deleted with it.