What is the Docker file system and how does it work?

What is the Docker file system and how does it work?

The Docker file system is a layered file system that allows you to create and manage containers. Each container has its own file system, which is built from a series of layers. These layers are created from Docker images, and they can be shared among containers, making it efficient.

Can you explain the concept of layers in the Docker file system?

Sure! In Docker, each layer represents a set of file changes. When you create a new image, it adds a new layer on top of the existing ones. This layering allows for efficient storage and sharing, as multiple images can share the same base layers.

How does the Docker file system handle data persistence?

Docker handles data persistence through volumes and bind mounts. Volumes are stored in a part of the host filesystem managed by Docker, while bind mounts allow you to specify a path on the host to be used in the container. This way, data can persist even if the container is removed.

What are the differences between Union File System and OverlayFS?

Union File System is a general concept for combining multiple file systems, while OverlayFS is a specific implementation used by Docker. OverlayFS allows for efficient layering and is optimized for performance, making it a popular choice for container file systems.