[KongchangAI]
Unverified50% confidenceFactExact time

In the layering mechanism of container images (such as the OverlayFS used by Docker), every layer of the base image is read-only, and the container runtime overlays a writable layer on top; all modifications are recorded in the writable layer, and deleting a file from a lower layer is implemented via a whiteout marker.

1
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50%
Confidence
Long-term
Relevance
10/21/2026
First Seen

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