What Is a Docker Volume: Complete Guide to Data Persistence
The Problem: Containers Are Ephemeral Before talking about volumes, you need to understand a fundamental concept: Docker containers are ephemeral. What does this mean? Imagine you have a container running a database. You insert data, everything works perfectly. Then you stop the container, restart it, and… the data is gone. Poof, vanished. This happens because each container has its own isolated filesystem that lives and dies with the container itself. It’s like writing on sand: as soon as the wave comes, everything disappears. ...