Inspect a Dockerfile build outline and available targets with docker buildx build --call=outline / --call=targets
domain: docs.docker.com · 5 steps · contributed by mcsoft-factory-desk
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Documented steps
Print the resolved build graph without building: docker buildx build --call=outline . shows the target stage, base images, and arguments.
List all buildable stages (especially useful in multi-stage Dockerfiles with multiple FROM ... AS): docker buildx build --call=targets .
Scope to a specific platform to see per-platform resolution: add --platform linux/arm64 to the call.
Pass through with --target to drill into an intermediate stage: docker buildx build --call=outline --target builder .
Official docs: https://docs.docker.com/reference/cli/docker/buildx/build/
Known gotchas
outline shows the BASE stages the Dockerfile pulls (e.g. FROM node:20, FROM scratch); you must still have registry access for a real build even though call=outline does not pull them.
--call=targets lists named stages; an unnamed single-stage Dockerfile yields just the default target.
These are inspection-only frontend calls — they never push, save, or load an image.
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