Chunk 0.2

## Summary In this chunk, the user was testing the test cluster infrastructure built in the previous chunk. Several operational issues were discovered and fixed. First, the `chmod` command in `init-data.sh` was failing because YugabyteDB Docker containers create files as root, so the script was updated to suppress permission errors gracefully. Second, the `db-init` container was failing with "database already exists" on subsequent runs, so the SQL command was adjusted with error suppression. Third, the startup script's wait logic for `db-init` was broken because `docker-compose ps` doesn't show exited containers by default, requiring a fix to use `docker-compose ps -a`. Finally, the Kuri nodes were failing to start with "no external module configured" because they need CAR file staging storage configured. ## Major Architecture Correction The most significant development was a fundamental architecture correction prompted by the user. The assistant had mistakenly configured the test cluster with Kuri nodes exposing S3 APIs directly and sharing a single configuration, but the user pointed to the `scalable-roadmap.md` which clearly shows that S3 frontend proxies are a **separate stateless node type** that routes requests to Kuri storage nodes. The user also identified that each Kuri node needs its own independent external HTTP endpoint for CAR file staging. The assistant then completely redesigned the test cluster: created `gen-config.sh` to generate **separate settings.env files** per node (with distinct `EXTERNAL_LOCALWEB_URL` and ports), updated `docker-compose.yml` to use a proper three-layer architecture (S3 Proxy on port 8078 → Kuri storage nodes internally → YugabyteDB), and rewrote the proxy configuration to route through the stateless frontend layer as specified in the roadmap.

From Permission Errors to Architecture Correction: Debugging a Distributed S3 Test Cluster 2796 words

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