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- Collection of file systems, ROOTFS, APPFS, USERFS.
- One copy of docker image can attach to many containers.
- From one image multiple containers can be created
- File system layered over each other.
- Higher layer wins.
- Each layer is each File system
- Layer 0 should be base image or Root FS
- Once image is attached to container, these layers will be attached to the container as a single layer
- The layers in the image will be in read only format, and to have the changes the thin layer in container should be used and commit that and form a new image