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

gsd_summary_version, phase, plan, type, wave, completed_date, duration_seconds

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

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