fix: remove QEMU setup, build linux/amd64 only on rootless Docker runners#51
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fix: remove QEMU setup, build linux/amd64 only on rootless Docker runners#51devops-bda wants to merge 1 commit into
devops-bda wants to merge 1 commit into
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…runners Rootless Docker runs containers in a user namespace where --privileged cannot write to /proc/sys/fs/binfmt_misc (a kernel-level operation). No binfmt version resolves this — it is a hard constraint of rootless Docker. Removes docker/setup-qemu-action and narrows platforms to linux/amd64, which is the native architecture of the self-hosted runners. To re-enable arm64 in future, register QEMU binfmt handlers at the host level once (as root) using: docker run --privileged --rm tonistiigi/binfmt --install all Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Root cause
Rootless Docker (self-hosted runners using
unix:///run/user/<uid>/docker.sock) runs containers inside a user namespace. Even with--privileged, the container cannot write to/proc/sys/fs/binfmt_miscbecause that is a kernel-level operation requiring real root. This is a hard constraint of rootless Docker — no binfmt image version can work around it.Changes
docker/setup-qemu-actionstep entirelyplatformsfromlinux/amd64,linux/arm64tolinux/amd64To re-enable arm64 in future
Register QEMU binfmt handlers at the host level once, as root, outside of Docker:
Or via a systemd one-shot service on the runner host. Once registered at the kernel level, buildx can use them without any in-workflow QEMU setup.
🤖 Generated with Claude Code