What is a Dockerfile?

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A text file containing ordered instructions that Docker reads to automatically build an image layer by layer — Each instruction (FROM, RUN, COPY, etc.) creates a new layer in the image. Docker executes them sequentially, caching unchanged layers to speed up subsequent builds.

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A YAML configuration file that defines multiple services, networks, and volumes for a multi-container application

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A binary manifest embedded inside every Docker image that records metadata about the build environment used

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A shell script that Docker executes inside a running container to install packages and configure the application

What is a Dockerfile?

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