# Lab 03: Compute & EC2 - Docker Compose Configuration
# Simula diverse EC2 instance types usando resource limits Docker

version: "3.8"

services:
  # Web Server - simula t2.micro (1 vCPU, 1 GB RAM)
  web:
    image: nginx:alpine
    container_name: lab03-web
    hostname: web

    deploy:
      resources:
        limits:
          cpus: '1'
          memory: 1G

    healthcheck:
      test: ["CMD", "wget", "--quiet", "--tries=1", "--spider", "http://localhost/"]
      interval: 10s
      timeout: 5s
      retries: 3
      start_period: 5s

    ports:
      - "127.0.0.1:8080:80"

    depends_on:
      app:
        condition: service_healthy

    restart: unless-stopped

  # Application Server - simula t2.small (1 vCPU, 2 GB RAM)
  app:
    image: nginx:alpine
    container_name: lab03-app
    hostname: app

    deploy:
      resources:
        limits:
          cpus: '1'
          memory: 2G

    healthcheck:
      test: ["CMD", "wget", "--quiet", "--tries=1", "--spider", "http://localhost/"]
      interval: 10s
      timeout: 5s
      retries: 3
      start_period: 5s

    ports:
      - "127.0.0.1:8081:80"

    depends_on:
      db:
        condition: service_healthy

    restart: unless-stopped

  # Worker - simula t2.medium (2 vCPU, 4 GB RAM)
  worker:
    image: alpine:3.19
    container_name: lab03-worker
    hostname: worker

    command: ["sh", "-c", "sleep 3600"]

    deploy:
      resources:
        limits:
          cpus: '2'
          memory: 4G

    healthcheck:
      test: ["CMD-SHELL", "exit 0"]
      interval: 30s
      timeout: 5s
      retries: 3

    restart: unless-stopped

  # Database - simula t2.medium (2 vCPU, 4 GB RAM)
  db:
    image: postgres:16-alpine
    container_name: lab03-db
    hostname: db

    environment:
      POSTGRES_DB: lab03_db
      POSTGRES_USER: lab03_user
      POSTGRES_PASSWORD: lab03_password
      POSTGRES_INITDB_ARGS: "-E UTF8"

    deploy:
      resources:
        limits:
          cpus: '2'
          memory: 4G

    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U lab03_user -d lab03_db || exit 1"]
      interval: 10s
      timeout: 5s
      retries: 5
      start_period: 10s

    volumes:
      - db-data:/var/lib/postgresql/data

    restart: unless-stopped

  # Stress Test Container - per verifica enforcement
  stress-test:
    image: alpine:3.19
    container_name: lab03-stress
    hostname: stress-test

    command: ["sh", "-c", "sleep 3600"]

    deploy:
      resources:
        limits:
          cpus: '0.5'
          memory: 512M

    healthcheck:
      test: ["CMD-SHELL", "exit 0"]
      interval: 5s
      timeout: 3s
      retries: 3

    restart: unless-stopped

# Persistent Volumes
volumes:
  db-data:
    driver: local