laboratori-cloud/.planning/phases/06-lab-05-database-rds/06-SUMMARY.md

---
gsd_summary_version: 1.0
phase: 06-lab-05-database-rds
plan: 01
type: execute
wave: 0
completed_date: "2026-04-03"
duration_seconds: 5400
---

# Phase 06 Plan 01: Database & RDS Lab Summary

**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).

## Performance

- **Duration:** 90 min
- **Started:** 2026-04-03T16:00:00Z
- **Completed:** 2026-04-03T17:30:00Z
- **Tasks:** 3 (combined RED/GREEN/docs approach)
- **Files created:** 17

## Accomplishments

- Created 7 test scripts for database creation, private network, persistence, and security
- Created docker-compose.yml with PostgreSQL in private network (RDS simulation)
- Created Dockerfile with postgresql-client for testing
- Created 6 documentation files (3 tutorials, 1 how-to, 1 reference, 1 explanation)
- Configured 3 services: app (multi-homed), db (PostgreSQL), test-public
- Full security compliance: INF-01 (non-root), INF-02 (private network), INF-03 (resource limits), INF-04 (named volume)

## Task Commits

Each task was committed atomically:

1. **Task 1: Create Test Infrastructure (RED phase)** - `cfbdb1e` (test)
2. **Task 2: Create Documentation** - `f8544af` (docs)
3. **Task 3: Implement Infrastructure (GREEN phase)** - `62723a0` (feat)

## Files Created

### Test Scripts (7 files, 1000+ lines)
- `labs/lab-05-database/tests/01-database-creation-test.sh` - PostgreSQL creation validation
- `labs/lab-05-database/tests/02-private-network-test.sh` - Private network isolation (INF-02)
- `labs/lab-05-database/tests/03-persistence-test.sh` - Data persistence verification (INF-04)
- `labs/lab-05-database/tests/04-security-test.sh` - Security compliance (INF-01, INF-02, INF-03)
- `labs/lab-05-database/tests/99-final-verification.sh` - End-to-end student verification
- `labs/lab-05-database/tests/run-all-tests.sh` - Test orchestration with fail-fast
- `labs/lab-05-database/tests/quick-test.sh` - Quick validation (< 30s)

### Documentation (6 files, 1500+ lines)
- `labs/lab-05-database/tutorial/01-deploy-rds-database.md` - Deploy PostgreSQL in private network
- `labs/lab-05-database/tutorial/02-data-persistence.md` - Data persistence with named volumes
- `labs/lab-05-database/tutorial/03-security-compliance.md` - INF-01/02/03/04 compliance
- `labs/lab-05-database/how-to-guides/connect-to-postgresql.md` - Connection methods
- `labs/lab-05-database/reference/postgresql-commands.md` - PostgreSQL command reference
- `labs/lab-05-database/explanation/database-rds-parallels.md` - Docker↔RDS parallels

### Infrastructure (2 files)
- `labs/lab-05-database/docker-compose.yml` - PostgreSQL in private network configuration
- `labs/lab-05-database/Dockerfile` - Alpine-based test image with postgresql-client

### Infrastructure Details

**Services (3 total):**
1. **app** - nginx:alpine (multi-homed: public + private networks)
   - For testing database connection from private network
   - Resource limits: 1 vCPU, 1 GB RAM

2. **db** - postgres:16-alpine (simulates RDS in VPC private subnet)
   - Only in vpc-private network
   - NO ports exposed on host (INF-02 compliant)
   - Resource limits: 2 vCPU, 4 GB RAM (INF-03 compliant)
   - Named volume: db-data (INF-04 compliant)
   - Healthcheck: pg_isready

3. **test-public** - alpine:3.19 (in vpc-public network)
   - For isolation testing

**Networks (2 total):**
- vpc-public: 10.0.1.0/24 (simulates public subnet)
- vpc-private: 10.0.2.0/24 with --internal flag (simulates private subnet)

**Volumes (1 total):**
- db-data - PostgreSQL data persistence

## Technical Implementation

### Database Security
- PostgreSQL runs as postgres user (non-root, INF-01 compliant)
- NO ports exposed on host (INF-02 compliant)
- Resource limits enforced (INF-03 compliant)
- Named volume for data (INF-04 compliant)

### Private Network Isolation
- Database only in private network with --internal flag
- Container app can connect (multi-homed: public + private)
- Container test-public CANNOT connect (network isolation)
- Host CANNOT connect (no port mapping)

### Data Persistence
- Named volume `lab05_db-data` for PostgreSQL data
- Data survives container restart
- Data survives container removal (with volume preservation)
- Verified with persistence test scripts

### Integration with Previous Labs
- **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)

## Requirements Covered

- **LAB-05:** PostgreSQL deployment in private network
- **TEST-01:** Test scripts validate database functionality
- **TEST-05:** Test harness with single command execution
- **INF-01:** No containers run as root
- **INF-02:** Private networks don't expose ports on host
- **INF-03:** All containers have resource limits
- **INF-04:** Data persists in named volumes
- **DOCT-01/02/03/04:** Diátaxis framework complete
- **PARA-01:** PostgreSQL mapped to RDS instance
- **PARA-02:** Cloud nomenclature used (VPC, subnet)
- **PARA-03/04:** Local vs cloud differences documented

## Deviations from Plan

None - plan executed exactly as specified. Lab 05 integrates all concepts from previous labs (01-04) into a comprehensive database simulation.

## Issues Encountered

None - combined approach executed successfully without issues.

## TDD Methodology Applied

- **RED Phase:** Test infrastructure created first ✅
- **GREEN Phase:** Infrastructure implemented to make tests pass ✅
- **Documentation:** Created during implementation phase ✅

## Next Phase Readiness

- Lab 05 complete and ready for student use
- All INF requirements (01-04) verified and compliant
- Database concepts established with clear cloud parallels
- Foundation laid for Phase 7 (Integration & Testing)

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.

---
*Phase: 06-lab-05-database-rds*
*Plan: 01*
*Completed: 2026-04-03*