Docker Volumes Explained: Keep Your Data After Containers Die
In this Docker tutorial, we explain Docker volumes: how to keep data alive even when containers are removed and recreated.
Containers are disposable, but your data is not. By default, files created inside a container belong to that container's temporary filesystem. When the container is removed, that data disappears. Docker volumes solve this by storing data outside the container and mounting it back in when needed.
You will learn what Docker volumes are, why container filesystems are temporary, how to create and mount a named volume, when to use named volumes, when bind mounts make sense, and why important application data should never live only inside a container filesystem.
What you will learn:
Why container filesystems are temporary
What happens to files when a container is removed
What Docker volumes are
How volumes keep data outside containers
How to create a Docker volume
How to mount a volume into a container
How to reuse the same data with a new container
The difference between named volumes and bind mounts
What anonymous volumes are
Why named volumes are best for databases and application state
Why bind mounts are useful during development
The core mental model for Docker data persistence
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