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fix: publish buildkitd port to host loopback, endpoint tcp://127.0.0.1

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Second failure mode: act_runner executes job steps in executor
containers running with network=host (despite container.network
config — that only applies to job containers). The buildx CLI
therefore resolves tcp://buildkitd:8375 in the HOST namespace,
where docker DNS names do not resolve.

Fix: publish buildkitd's TCP port to host loopback
(-p 127.0.0.1:8375:8375) and use tcp://127.0.0.1:8375 as the
endpoint. Works from both host-network executors and job
containers; port is not exposed on any external interface.

Validated on oracle: buildx remote Status running,
platforms linux/arm64,v7,v6.
This commit is contained in:
meda
2026-09-01 13:25:02 +02:00
parent 5969123c2e
commit 7c97a428ae
1 changed files with 2 additions and 1 deletions
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action.yml
+2 -1
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@@ -39,6 +39,7 @@ runs:
docker ps -a --format '{{.Names}}' | grep -qx '${{ inputs.container_name }}' || \ docker ps -a --format '{{.Names}}' | grep -qx '${{ inputs.container_name }}' || \
docker run -d --name ${{ inputs.container_name }} --privileged \ docker run -d --name ${{ inputs.container_name }} --privileged \
--network ${{ inputs.network }} \ --network ${{ inputs.network }} \
-p 127.0.0.1:${{ inputs.port }}:${{ inputs.port }} \
--restart unless-stopped \ --restart unless-stopped \
--label com.centurylinklabs.watchtower.monitor-only=${{ inputs.monitor_only }} \ --label com.centurylinklabs.watchtower.monitor-only=${{ inputs.monitor_only }} \
--label dockhand.notify=${{ inputs.dockhand_notify }} \ --label dockhand.notify=${{ inputs.dockhand_notify }} \
@@ -48,7 +49,7 @@ runs:
uses: docker/setup-buildx-action@v4 uses: docker/setup-buildx-action@v4
with: with:
driver: remote driver: remote
endpoint: tcp://${{ inputs.container_name }}:${{ inputs.port }} endpoint: tcp://127.0.0.1:${{ inputs.port }}
- name: Stop BuildKit (idle cleanup) - name: Stop BuildKit (idle cleanup)
if: ${{ inputs.cleanup == 'true' && always() }} if: ${{ inputs.cleanup == 'true' && always() }}