Docker and CI/CD · Senior · Question 73 of 75

What does the `--platform=$BUILDPLATFORM` trick in a builder stage achieve?

1It skips building for platforms the registry lacks
2It forces the image to run on the build machine only
✓Correct answer: The build stage runs natively and cross-compiles for the target

Explanation

Compile steps run at native speed, using TARGETOS and TARGETARCH to produce output for each target. Only the small final stage is per-platform.

Further reading

Docker Docs: Multi-platform builds ↗

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