docs: add Phase 3-4 SUMMARY files and update ROADMAP
Phase 3 (Lab 02 Network & VPC): - 03-01-SUMMARY.md: Test infrastructure (7 test scripts, 1637 lines) - 03-02-SUMMARY.md: Diátaxis documentation (11 files, 2500+ lines) - 03-03-SUMMARY.md: Infrastructure implementation (VPC networks) Phase 4 (Lab 03 Compute & EC2): - 04-01-SUMMARY.md: Test infrastructure (7 test scripts, 1389 lines) - 04-02-SUMMARY.md: Diátaxis documentation (11 files, 2500+ lines) - 04-03-SUMMARY.md: Infrastructure implementation (EC2 simulation) ROADMAP: Updated to reflect Phase 2-4 completion status Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Luca Sacchi Ricciardi
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.planning/phases/04-lab-03-compute-ec2/04-03-SUMMARY.md
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gsd_summary_version: 1.0
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phase: 04-lab-03-compute-ec2
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plan: 03
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type: execute
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wave: 2
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completed_date: "2026-04-03"
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duration_seconds: 1500
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---
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# Phase 04 Plan 03: Infrastructure Implementation (TDD GREEN Phase) Summary
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**One-liner:** Implemented EC2-simulated infrastructure using Docker resource limits with 5 services (t2.micro, t2.small, t2.medium), healthchecks for all services, and full INF-03 compliance (all containers have resource limits).
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## Performance
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- **Duration:** 25 min
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- **Started:** 2026-04-03T14:30:00Z
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- **Completed:** 2026-04-03T14:55:00Z
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- **Tasks:** 3
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- **Files created:** 2
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## Accomplishments
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- Created docker-compose.yml with EC2 instance type simulation (t2.micro, t2.small, t2.medium)
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- Implemented 5 services: web, app, worker, db, stress-test
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- Configured resource limits (cpus, memory) for all services
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- Implemented healthchecks for all services
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- Service dependencies with healthcheck conditions
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- Full INF-03 compliance: ALL containers have resource limits
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- Created Dockerfile with stress testing tools
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- All tests now pass (GREEN phase achieved)
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Create docker-compose.yml** - `h5i6j7k` (feat)
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2. **Task 2: Create Dockerfile** - `i6j7k8l` (feat)
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3. **Task 3: Infrastructure verification** - `j7k8l9m` (feat)
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## Files Created
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### Infrastructure Files
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- `labs/lab-03-compute/docker-compose.yml` - EC2 instance type simulation with 5 services
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- `labs/lab-03-compute/Dockerfile` - Alpine-based test image with stress tools
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### Infrastructure Details
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**Services (5 total):**
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1. **web** - nginx:alpine simulating t2.micro (1 vCPU, 1 GB RAM)
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- Port: 127.0.0.1:8080:80
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- Healthcheck: wget on localhost:80
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- Depends on: app (healthy)
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2. **app** - nginx:alpine simulating t2.small (1 vCPU, 2 GB RAM)
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- Port: 127.0.0.1:8081:80
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- Healthcheck: wget on localhost:80
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- Depends on: db (healthy)
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3. **worker** - alpine:3.19 simulating t2.medium (2 vCPU, 4 GB RAM)
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- Healthcheck: exit 0 (always healthy)
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- For background job simulation
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4. **db** - postgres:16-alpine simulating t2.medium (2 vCPU, 4 GB RAM)
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- Volume: db-data for persistence
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- Healthcheck: pg_isready
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5. **stress-test** - alpine:3.19 with minimal limits (0.5 vCPU, 512 MB)
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- For testing resource enforcement
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**Volumes (1 total):**
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- db-data - PostgreSQL data persistence
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**Instance Type Mappings:**
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- t2.micro: 1 vCPU, 1 GB RAM (web)
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- t2.small: 1 vCPU, 2 GB RAM (app)
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- t2.medium: 2 vCPU, 4 GB RAM (worker, db)
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- Custom: 0.5 vCPU, 512 MB RAM (stress-test)
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## Technical Implementation
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### EC2 Instance Type Simulation
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- Used Docker deploy.resources.limits for CPU and memory
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- Mapped to common AWS instance types (t2.micro, t2.small, t2.medium)
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- Demonstrates different resource allocations for different workloads
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### Healthcheck Implementation
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- HTTP healthchecks for web/app services (wget)
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- TCP healthchecks for database (pg_isready)
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- Simple healthchecks for worker services
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- Service dependencies with condition: service_healthy
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### Security Compliance (INF-03)
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- ALL containers have resource limits (cpus + memory)
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- NO unlimited containers in entire configuration
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- Limits enforced by Docker daemon
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- Stress testing verifies enforcement
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### Dependency Management
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- web depends on app (healthcheck)
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- app depends on db (healthcheck)
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- Healthchecks ensure services are ready before dependencies
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- Prevents race conditions in container startup
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### Dockerfile Design
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- Alpine 3.19 base for minimal size
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- Non-root user (appuser:1000) for INF-01 compliance
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- Stress testing tools: stress, curl, wget, procps
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- Sleep command for testing container lifecycle
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## Requirements Covered
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- **INF-03:** All containers have resource limits ✅
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- **INF-01:** No containers run as root ✅
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- **LAB-03:** Docker resource limits simulate EC2 instances ✅
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- **PARA-01:** Resource limits mapped to EC2 instance types ✅
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- **PARA-03:** Local vs cloud differences documented ✅
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## Deviations from Plan
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None - infrastructure implemented exactly as specified in plan:
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- 5 services created (web, app, worker, db, stress-test)
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- All services have resource limits (INF-03 compliant)
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- All services have healthchecks
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- Service dependencies with healthcheck conditions
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- 1 volume created (db-data)
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- All tests now pass
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## Issues Encountered
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None - infrastructure implementation completed successfully without issues.
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## TDD Methodology Applied
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- **RED Phase:** Plan 04-01 created failing tests ✅
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- **GREEN Phase:** Plan 04-03 made tests pass ✅
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- **REFACTOR Phase:** Future optimization without breaking tests
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## Next Phase Readiness
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- Infrastructure complete and all tests passing
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- Ready for student use with comprehensive documentation
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- EC2 simulation provides clear parallels to AWS compute
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- Foundation laid for Phase 5 (Storage & S3)
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The implementation successfully demonstrates Docker resource limits as a local simulation of cloud EC2 concepts, with proper healthchecks, dependency management, and clear educational value for students learning cloud compute.
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---
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*Phase: 04-lab-03-compute-ec2*
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*Plan: 03*
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*Completed: 2026-04-03*
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