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What does "Docker layer" mean in programming?
Docker layer is one of the most common terms in software development. This guide explains what it means, how it is used in practice, and why it matters, with real examples from the developer world.
Definition
A read-only filesystem change stacked on top of previous layers to form a Docker image. Layers are cached, so unchanged layers are reused on subsequent builds to speed up the process.
Example
"Each RUN instruction in the Dockerfile creates a new Docker layer."
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