docs: complete Phase 6 Lab 05 Database & RDS
Phase 6 (Lab 05 Database & RDS): - 06-SUMMARY.md: Complete lab summary (90 min, 17 files) Lab 05 integrates ALL previous concepts: - Lab 01: Non-root containers (INF-01) ✓ - Lab 02: Private networks (INF-02) ✓ - Lab 03: Resource limits (INF-03) ✓ - Lab 04: Named volumes (INF-04) ✓ Key features: - PostgreSQL in private network → RDS in VPC - Named volume → EBS volume - Resource limits → DB instance class - Complete Diátaxis documentation ROADMAP: Updated to reflect Phase 6 completion Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Luca Sacchi Ricciardi
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gsd_summary_version: 1.0
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phase: 06-lab-05-database-rds
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plan: 01
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type: execute
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wave: 0
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completed_date: "2026-04-03"
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duration_seconds: 5400
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---
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# Phase 06 Plan 01: Database & RDS Lab Summary
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**One-liner:** Implemented complete Lab 05 Database & RDS with PostgreSQL in Docker private network, following TDD methodology with comprehensive test infrastructure, Diátaxis documentation, and security compliance (INF-01 through INF-04).
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## Performance
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- **Duration:** 90 min
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- **Started:** 2026-04-03T16:00:00Z
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- **Completed:** 2026-04-03T17:30:00Z
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- **Tasks:** 3 (combined RED/GREEN/docs approach)
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- **Files created:** 17
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## Accomplishments
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- Created 7 test scripts for database creation, private network, persistence, and security
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- Created docker-compose.yml with PostgreSQL in private network (RDS simulation)
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- Created Dockerfile with postgresql-client for testing
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- Created 6 documentation files (3 tutorials, 1 how-to, 1 reference, 1 explanation)
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- Configured 3 services: app (multi-homed), db (PostgreSQL), test-public
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- Full security compliance: INF-01 (non-root), INF-02 (private network), INF-03 (resource limits), INF-04 (named volume)
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Create Test Infrastructure (RED phase)** - `cfbdb1e` (test)
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2. **Task 2: Create Documentation** - `f8544af` (docs)
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3. **Task 3: Implement Infrastructure (GREEN phase)** - `62723a0` (feat)
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## Files Created
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### Test Scripts (7 files, 1000+ lines)
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- `labs/lab-05-database/tests/01-database-creation-test.sh` - PostgreSQL creation validation
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- `labs/lab-05-database/tests/02-private-network-test.sh` - Private network isolation (INF-02)
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- `labs/lab-05-database/tests/03-persistence-test.sh` - Data persistence verification (INF-04)
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- `labs/lab-05-database/tests/04-security-test.sh` - Security compliance (INF-01, INF-02, INF-03)
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- `labs/lab-05-database/tests/99-final-verification.sh` - End-to-end student verification
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- `labs/lab-05-database/tests/run-all-tests.sh` - Test orchestration with fail-fast
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- `labs/lab-05-database/tests/quick-test.sh` - Quick validation (< 30s)
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### Documentation (6 files, 1500+ lines)
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- `labs/lab-05-database/tutorial/01-deploy-rds-database.md` - Deploy PostgreSQL in private network
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- `labs/lab-05-database/tutorial/02-data-persistence.md` - Data persistence with named volumes
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- `labs/lab-05-database/tutorial/03-security-compliance.md` - INF-01/02/03/04 compliance
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- `labs/lab-05-database/how-to-guides/connect-to-postgresql.md` - Connection methods
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- `labs/lab-05-database/reference/postgresql-commands.md` - PostgreSQL command reference
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- `labs/lab-05-database/explanation/database-rds-parallels.md` - Docker↔RDS parallels
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### Infrastructure (2 files)
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- `labs/lab-05-database/docker-compose.yml` - PostgreSQL in private network configuration
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- `labs/lab-05-database/Dockerfile` - Alpine-based test image with postgresql-client
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### Infrastructure Details
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**Services (3 total):**
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1. **app** - nginx:alpine (multi-homed: public + private networks)
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- For testing database connection from private network
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- Resource limits: 1 vCPU, 1 GB RAM
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2. **db** - postgres:16-alpine (simulates RDS in VPC private subnet)
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- Only in vpc-private network
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- NO ports exposed on host (INF-02 compliant)
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- Resource limits: 2 vCPU, 4 GB RAM (INF-03 compliant)
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- Named volume: db-data (INF-04 compliant)
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- Healthcheck: pg_isready
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3. **test-public** - alpine:3.19 (in vpc-public network)
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- For isolation testing
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**Networks (2 total):**
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- vpc-public: 10.0.1.0/24 (simulates public subnet)
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- vpc-private: 10.0.2.0/24 with --internal flag (simulates private subnet)
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**Volumes (1 total):**
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- db-data - PostgreSQL data persistence
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## Technical Implementation
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### Database Security
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- PostgreSQL runs as postgres user (non-root, INF-01 compliant)
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- NO ports exposed on host (INF-02 compliant)
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- Resource limits enforced (INF-03 compliant)
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- Named volume for data (INF-04 compliant)
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### Private Network Isolation
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- Database only in private network with --internal flag
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- Container app can connect (multi-homed: public + private)
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- Container test-public CANNOT connect (network isolation)
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- Host CANNOT connect (no port mapping)
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### Data Persistence
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- Named volume `lab05_db-data` for PostgreSQL data
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- Data survives container restart
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- Data survives container removal (with volume preservation)
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- Verified with persistence test scripts
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### Integration with Previous Labs
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- **Lab 01:** Non-root containers (INF-01)
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- **Lab 02:** Private networks (INF-02)
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- **Lab 03:** Resource limits (INF-03)
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- **Lab 04:** Named volumes (INF-04)
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## Requirements Covered
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- **LAB-05:** PostgreSQL deployment in private network
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- **TEST-01:** Test scripts validate database functionality
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- **TEST-05:** Test harness with single command execution
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- **INF-01:** No containers run as root
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- **INF-02:** Private networks don't expose ports on host
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- **INF-03:** All containers have resource limits
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- **INF-04:** Data persists in named volumes
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- **DOCT-01/02/03/04:** Diátaxis framework complete
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- **PARA-01:** PostgreSQL mapped to RDS instance
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- **PARA-02:** Cloud nomenclature used (VPC, subnet)
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- **PARA-03/04:** Local vs cloud differences documented
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## Deviations from Plan
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None - plan executed exactly as specified. Lab 05 integrates all concepts from previous labs (01-04) into a comprehensive database simulation.
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## Issues Encountered
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None - combined approach executed successfully without issues.
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## TDD Methodology Applied
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- **RED Phase:** Test infrastructure created first ✅
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- **GREEN Phase:** Infrastructure implemented to make tests pass ✅
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- **Documentation:** Created during implementation phase ✅
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## Next Phase Readiness
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- Lab 05 complete and ready for student use
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- All INF requirements (01-04) verified and compliant
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- Database concepts established with clear cloud parallels
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- Foundation laid for Phase 7 (Integration & Testing)
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The implementation successfully demonstrates PostgreSQL in Docker as a local simulation of RDS concepts, with proper security, isolation, persistence, and clear educational value for students learning cloud databases.
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---
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*Phase: 06-lab-05-database-rds*
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*Plan: 01*
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*Completed: 2026-04-03*
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