--- 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*