Docker
Image Layer
An image layer represents a filesystem change used to construct a container image. Layers can be shared between images and cached, while image configuration records additional metadata that is not itself a filesystem layer.
Also known as: Docker layer, container layer
Why it matters
Filesystem changes remain part of image history even after later instructions hide files.
Practical example
Deleting a secret in a later layer does not erase it from an earlier layer.
Related terms
Sources
Definition reviewed .
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