CIA/e-voting-system/docker-compose.multinode.yml

version: '3.8'

services:
  # ================================================================
  # MariaDB Database (Shared)
  # ================================================================
  mariadb:
    image: mariadb:latest
    container_name: evoting_db
    restart: unless-stopped
    environment:
      MYSQL_ROOT_PASSWORD: ${DB_ROOT_PASSWORD:-rootpass123}
      MYSQL_DATABASE: ${DB_NAME:-evoting_db}
      MYSQL_USER: ${DB_USER:-evoting_user}
      MYSQL_PASSWORD: ${DB_PASSWORD:-evoting_pass123}
      MYSQL_INITDB_SKIP_TZINFO: 1
    ports:
      - "${DB_PORT:-3306}:3306"
    volumes:
      - evoting_data:/var/lib/mysql
      - ./docker/init.sql:/docker-entrypoint-initdb.d/01-init.sql
      - ./docker/populate_past_elections.sql:/docker-entrypoint-initdb.d/02-populate.sql
      - ./docker/create_active_election.sql:/docker-entrypoint-initdb.d/03-active.sql
    networks:
      - evoting_network
    healthcheck:
      test: ["CMD", "mariadb-admin", "ping", "-h", "localhost", "--silent"]
      timeout: 20s
      retries: 10
      start_period: 40s

  # ================================================================
  # Backend Node 1 (Internal Port 8000, No external binding)
  # ================================================================
  backend-node-1:
    build:
      context: .
      dockerfile: docker/Dockerfile.backend
    container_name: evoting_backend_node1
    restart: unless-stopped
    environment:
      DB_HOST: mariadb
      DB_PORT: 3306
      DB_NAME: ${DB_NAME:-evoting_db}
      DB_USER: ${DB_USER:-evoting_user}
      DB_PASSWORD: ${DB_PASSWORD:-evoting_pass123}
      SECRET_KEY: ${SECRET_KEY:-your-secret-key-change-in-production}
      DEBUG: ${DEBUG:-false}
      PYTHONUNBUFFERED: 1
      NODE_ID: node1
      NODE_PORT: 8000
    expose:
      - "8000"
    depends_on:
      mariadb:
        condition: service_healthy
    volumes:
      - ./backend:/app/backend
      - backend_cache_1:/app/.cache
    networks:
      - evoting_network
    command: uvicorn backend.main:app --host 0.0.0.0 --port 8000 --reload
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost:8000/health"]
      interval: 30s
      timeout: 10s
      retries: 3
      start_period: 40s

  # ================================================================
  # Backend Node 2 (Internal Port 8000, No external binding)
  # ================================================================
  backend-node-2:
    build:
      context: .
      dockerfile: docker/Dockerfile.backend
    container_name: evoting_backend_node2
    restart: unless-stopped
    environment:
      DB_HOST: mariadb
      DB_PORT: 3306
      DB_NAME: ${DB_NAME:-evoting_db}
      DB_USER: ${DB_USER:-evoting_user}
      DB_PASSWORD: ${DB_PASSWORD:-evoting_pass123}
      SECRET_KEY: ${SECRET_KEY:-your-secret-key-change-in-production}
      DEBUG: ${DEBUG:-false}
      PYTHONUNBUFFERED: 1
      NODE_ID: node2
      NODE_PORT: 8000
    expose:
      - "8000"
    depends_on:
      mariadb:
        condition: service_healthy
    volumes:
      - ./backend:/app/backend
      - backend_cache_2:/app/.cache
    networks:
      - evoting_network
    command: uvicorn backend.main:app --host 0.0.0.0 --port 8000 --reload
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost:8000/health"]
      interval: 30s
      timeout: 10s
      retries: 3
      start_period: 40s

  # ================================================================
  # Backend Node 3 (Internal Port 8000, No external binding)
  # ================================================================
  backend-node-3:
    build:
      context: .
      dockerfile: docker/Dockerfile.backend
    container_name: evoting_backend_node3
    restart: unless-stopped
    environment:
      DB_HOST: mariadb
      DB_PORT: 3306
      DB_NAME: ${DB_NAME:-evoting_db}
      DB_USER: ${DB_USER:-evoting_user}
      DB_PASSWORD: ${DB_PASSWORD:-evoting_pass123}
      SECRET_KEY: ${SECRET_KEY:-your-secret-key-change-in-production}
      DEBUG: ${DEBUG:-false}
      PYTHONUNBUFFERED: 1
      NODE_ID: node3
      NODE_PORT: 8000
    expose:
      - "8000"
    depends_on:
      mariadb:
        condition: service_healthy
    volumes:
      - ./backend:/app/backend
      - backend_cache_3:/app/.cache
    networks:
      - evoting_network
    command: uvicorn backend.main:app --host 0.0.0.0 --port 8000 --reload
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost:8000/health"]
      interval: 30s
      timeout: 10s
      retries: 3
      start_period: 40s

  # ================================================================
  # Nginx Load Balancer (Reverse Proxy)
  # Routes to all backend nodes on port 8000
  # ================================================================
  nginx:
    image: nginx:latest
    container_name: evoting_nginx
    restart: unless-stopped
    ports:
      - "8000:8000"
    volumes:
      - ./docker/nginx.conf:/etc/nginx/nginx.conf:ro
    depends_on:
      - backend-node-1
      - backend-node-2
      - backend-node-3
    networks:
      - evoting_network
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost:8000/health"]
      interval: 30s
      timeout: 10s
      retries: 3

  # ================================================================
  # Frontend Next.js Service
  # ================================================================
  frontend:
    build:
      context: .
      dockerfile: docker/Dockerfile.frontend
      args:
        NEXT_PUBLIC_API_URL: http://localhost:8000
    container_name: evoting_frontend
    restart: unless-stopped
    ports:
      - "${FRONTEND_PORT:-3000}:3000"
    depends_on:
      - nginx
    environment:
      NEXT_PUBLIC_API_URL: http://localhost:8000
      NODE_ENV: production
    networks:
      - evoting_network
    healthcheck:
      test: ["CMD", "wget", "--quiet", "--tries=1", "--spider", "http://localhost:3000/"]
      interval: 30s
      timeout: 10s
      retries: 3
      start_period: 40s

  # ================================================================
  # Adminer (Database Management UI)
  # ================================================================
  adminer:
    image: adminer:latest
    container_name: evoting_adminer
    restart: unless-stopped
    ports:
      - "8081:8080"
    depends_on:
      - mariadb
    networks:
      - evoting_network
    environment:
      ADMINER_DEFAULT_SERVER: mariadb

volumes:
  evoting_data:
    driver: local
  backend_cache_1:
    driver: local
  backend_cache_2:
    driver: local
  backend_cache_3:
    driver: local

networks:
  evoting_network:
    driver: bridge
    ipam:
      config:
        - subnet: 172.25.0.0/16