beginner~4h
Dockerfile Instructions & Multi-Stage Builds
A Dockerfile is a declarative, line-by-line recipe for building an image. Each instruction either creates a new layer (FROM, RUN, COPY, ADD) or sets image metadata that doesn't add a filesystem layer
Learning objectives
- Explain what each of the core Dockerfile instructions actually does at build time versus at container-run time.
- Explain precisely what problem multi-stage builds solve, and what happens to a discarded build stage.
- Distinguish CMD from ENTRYPOINT, and predict how they combine when both are present.
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Dockerfile Instructions & Multi-Stage Builds