docs(07-03): complete production compose stack and runbook plan
- SUMMARY for 07-03: docker-compose.prod.yaml, deploy/Caddyfile, README runbook
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Arthur Belleville
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.planning/phases/07-deploy-v1/07-03-SUMMARY.md
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---
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phase: 07-deploy-v1
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plan: "03"
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subsystem: backend-deploy
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tags: [go, docker, docker-compose, caddy, tls, runbook, deploy]
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dependency_graph:
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requires:
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- 07-02 (Dockerfile producing /app/web and /app/worker — referenced by image + command in compose)
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- 07-01 (RunMigrations called at web startup — D-10 assumption in runbook)
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provides:
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- backend/docker-compose.prod.yaml — production compose stack (D-01..D-04, D-08)
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- backend/deploy/Caddyfile — TLS reverse proxy config with {$DOMAIN} interpolation (D-04)
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- backend/README.md Deploy/Rollback/Incident sections — operator runbook (DEPLOY-05)
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affects:
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- backend/docker-compose.prod.yaml (new file)
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- backend/deploy/Caddyfile (new file)
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- backend/README.md (extended)
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tech_stack:
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added:
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- docker compose v2 (no `version:` key) — production orchestration on Hetzner VM
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- caddy:2-alpine — TLS termination with automatic Let's Encrypt certificate management
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patterns:
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- Same image, different command: pattern for web/worker services (D-08)
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- No postgres host ports binding — internal network only (RESEARCH Pitfall 5, T-07-09)
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- depends_on with service_healthy to prevent goose.Up() racing Postgres init (T-07-12)
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- {$DOMAIN} Caddy env var interpolation for domain-agnostic Caddyfile
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- caddy_data named volume for persistent Let's Encrypt certificate storage (T-07-11)
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key_files:
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created:
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- backend/docker-compose.prod.yaml
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- backend/deploy/Caddyfile
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modified:
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- backend/README.md
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decisions:
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- "No `ports:` on postgres service — internal compose network only; no host access (T-07-09 mitigated)"
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- "Caddyfile uses {$DOMAIN} env var interpolation — domain is operator-configured in .env.prod, Caddyfile stays generic"
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- "caddy_data and caddy_config as named volumes — persists TLS certs across Caddy restarts; loss triggers rate-limit risk (T-07-11 accepted + documented)"
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- "No CMD in compose — command: per service overrides Dockerfile's missing CMD, consistent with D-08 and Plan 02 decision"
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- "Runbook includes break-glass goose down steps — schema rollback edge case documented even though it is not the normal path"
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metrics:
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duration: "~5 minutes"
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completed: "2026-05-15"
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tasks: 2
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files: 3
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---
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# Phase 7 Plan 3: Production compose stack, Caddyfile, and operator runbook Summary
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## What Was Built
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Production Docker Compose stack with postgres, web, worker, and caddy services; a Caddy reverse proxy config with Let's Encrypt TLS and {$DOMAIN} env var interpolation; and an extended README runbook covering first-time deploy, routine deploys, rollback by image tag, and incident triage procedures.
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## Tasks Completed
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| Task | Name | Commit | Files |
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|------|------|--------|-------|
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| 1 | docker-compose.prod.yaml and deploy/Caddyfile | 273f063 | backend/docker-compose.prod.yaml, backend/deploy/Caddyfile |
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| 2 | Extend README with Deploy, Rollback, Incident Runbook sections | f261fb3 | backend/README.md |
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## Decisions Made
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1. Postgres service has no `ports:` directive — the postgres container is only reachable within the Docker Compose internal network. Exposing port 5432 on a VM with a public IP would allow unauthenticated internet access (T-07-09 mitigated per RESEARCH Pitfall 5).
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2. `{$DOMAIN}` Caddy env var interpolation is used in the Caddyfile site block — this keeps the Caddyfile generic and domain-agnostic. Operators set `DOMAIN=app.yourdomain.com` in `.env.prod`; Caddy reads it at startup without any Caddyfile editing.
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3. `caddy_data` and `caddy_config` are named volumes — Let's Encrypt certificates are stored in `caddy_data`. If this volume is lost, Caddy must re-issue certificates, which risks hitting Let's Encrypt's rate limit of 5 duplicate certificates per week (T-07-11 accepted; recovery steps documented in incident runbook).
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4. No CMD override in compose — the compose `command:` per service (D-08) is the only invocation path. This is consistent with Plan 02's decision to omit CMD from the Dockerfile's final stage.
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5. Break-glass schema rollback via external goose CLI — the distroless runtime image has no shell and no goose binary (RESEARCH Pitfall 7). The runbook documents using either a locally-installed goose CLI or the `ghcr.io/kukymbr/goose-docker` image on the compose network as the path for manual `goose down` when needed.
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## Deviations from Plan
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None — plan executed exactly as written.
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## Verification
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All 10 success criteria checked:
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1. `docker-compose.prod.yaml` contains postgres, web, worker, caddy services — PASS
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2. postgres service has no `ports:` directive (internal network only) — PASS
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3. web service has `command: /app/web` — PASS
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4. worker service has `command: /app/worker` — PASS
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5. Both web and worker have `depends_on: postgres: condition: service_healthy` — PASS (count: 2)
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6. caddy service has `caddy_data` and `caddy_config` named volumes — PASS
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7. `backend/deploy/Caddyfile` exists with `{$DOMAIN}` site block and `reverse_proxy web:8080` — PASS
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8. `grep -c "^## Deploy\|^## Rollback\|^## Incident Runbook" backend/README.md` returns 3 — PASS
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9. README includes `chmod 600 .env.prod` and `openssl rand -hex 32` for SESSION_SECRET — PASS
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10. README rollback section documents image tag redeployment (D-11) — PASS
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Note: `docker compose -f docker-compose.prod.yaml config --quiet` could not be run — Docker Engine
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is not installed on this development machine. YAML syntax was validated by manual inspection
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and Python content checks; the compose file uses standard compose v2 syntax with no custom
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extensions.
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## Known Stubs
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None — this plan creates infrastructure config files and documentation only; no application
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code stubs introduced.
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## Threat Flags
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No new threat surface beyond plan's threat_model. Security mitigations applied:
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- T-07-09 mitigated: No `ports:` on postgres service in docker-compose.prod.yaml
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- T-07-10 mitigated: README runbook includes `chmod 600 .env.prod` instruction
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- T-07-11 accepted + documented: caddy_data volume loss recovery steps in incident runbook
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- T-07-12 mitigated: `depends_on: postgres: condition: service_healthy` prevents goose.Up() racing Postgres init
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## Self-Check: PASSED
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- backend/docker-compose.prod.yaml: EXISTS (273f063)
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- backend/deploy/Caddyfile: EXISTS (273f063)
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- backend/README.md: EXISTS with 3 new H2 sections (f261fb3)
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- Commits 273f063 and f261fb3: VERIFIED in git log
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