fix: arm64 images contain amd64 binaries due to hardcoded TARGETARCH default#117
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novatechflow merged 1 commit intoKafScale:mainfrom Feb 27, 2026
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…uilds All Go-based Dockerfiles declare ARG TARGETARCH=amd64 inside the builder stage. Per docker/buildx#510, explicit defaults on automatic platform args shadow the values that buildx injects via --platform. This causes every platform variant to compile an amd64 binary, regardless of the target platform. The CI workflow correctly passes platforms: linux/amd64,linux/arm64 to docker/build-push-action, but the resulting arm64 image layers contain amd64 Go binaries. Running on arm64 hosts (e.g. AWS Graviton) fails with: exec format error The fix removes the =linux and =amd64 defaults. Buildx sets these args automatically per platform. Without defaults, the injected values are used correctly. Affected images: broker, operator, console, proxy, mcp, e2e-client.
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PaxMachinaOne
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Feb 27, 2026
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Great catch @klaudworks!
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Summary
Just tried to deploy this on an ARM machine and there was a amd64 binary inside the docker image.
Per docker/buildx#510 explicit defaults for Dockerfile
platform args shadow the values that buildx injects via --platform.
This causes every platform variant to compile an amd64 binary,
regardless of the target platform.
Solution
Just don't specify a default.