Multi-stage Docker builds
WHAT IT TESTS: separating build tooling from runtime. OUTLINE: a build stage compiles with the toolchain, the final stage uses a minimal base and copies only the artifact, cutting size and attack surface. RED FLAG: shipping compilers and source.
WHAT IT TESTS: decoupling build-time tooling from the runtime image. ANSWER OUTLINE: use one stage with the full SDK to compile the app, then a final stage from a tiny base such as alpine, distroless, or scratch that copies only the compiled binary or jar via COPY --from. The toolchain, source, and build caches never reach the final image. Beyond size, this cuts the attack surface, speeds pulls and deploys, and reduces vulnerabilities. RED FLAG: leaving compilers and source in the shipped image.
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- #docker
- #multi-stage-build
- #image-size
- #security
- #containers
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