Promote synvya-staging to synvya: serialize build stages + 60m SSH timeout#47
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alejandro-runner merged 3 commits intosynvyafrom Apr 29, 2026
Merged
Promote synvya-staging to synvya: serialize build stages + 60m SSH timeout#47alejandro-runner merged 3 commits intosynvyafrom
alejandro-runner merged 3 commits intosynvyafrom
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The cold build on a t3.medium production host locked the box hard enough that SSH and SSM both became unresponsive. Root cause: BuildKit runs independent stages in parallel by default, so cargo release build (-j 2, ~3 GB RSS) and bun/vite build (NODE_OPTIONS 2 GB) ran simultaneously on a 4 GB instance. Even with 4 GB swap the system thrashed into a kernel lockup. Two changes: 1. Add a no-op `COPY --from=rust-builder /artifacts/keycast /tmp/.rust-builder-done` as the first instruction of web-builder. BuildKit sees the cross-stage dependency and only starts web-builder once rust-builder finishes, so cargo and bun never run concurrently. 2. Bump appleboy/ssh-action `command_timeout` from 30m to 60m across all four deploy/QA steps. A cold cargo + bun build on t3.medium with -j 2 takes ~45-55 min; the previous 30m killed the SSH session mid-build. Once cache mounts are populated by a successful cold build, warm builds return to a few minutes and stay well under the new timeout. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
When ec2-prepare-host.sh is invoked under sudo (e.g. while debugging on the host), $HOME resolves to /root and the cargo [build] jobs=2 config lands in /root/.cargo/config.toml. The deploy/QA workflow runs the script over SSH as ec2-user, so it never reads that config — defeating the limit. Detect SUDO_USER and write to that user's home instead, then chown the .cargo/ tree back to them so cargo can read/write it when running under their UID. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
fix(docker): serialize build stages + bump SSH timeout
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Summary
Promotes the build serialization fix to production. This is the follow-up to #45 — without these changes, the prod cold build locks the host because BuildKit runs cargo + bun in parallel.
What's in this merge
Validated on staging
Staging redeploy completed successfully with the serialize fix.
Production state
The prod EC2 has been manually prepared (swap active, cargo jobs config in place, repo synced) so the next deploy starts from a healthy baseline.
Test plan
Follow-up worth doing
The robust fix for low-mem prod is to stop building on the prod host: build once on GitHub Actions (16 GB RAM), push image to a registry, prod just `docker compose pull && up -d`. Worth scheduling.