docker-compose.yml

# SyncDoc — Production docker-compose
#
# Architecture:
#   nginx        → reverse proxy / load balancer (ip_hash sticky sessions)
#   app1, app2   → two Node.js app containers (Express + WebSocket)
#   postgres     → PostgreSQL 16 (shared by both app containers)
#   redis        → Redis 7 (pub/sub for cross-server Yjs update relay)
#
# Prerequisites:
#   1. Create a .env file in this directory:
#        POSTGRES_PASSWORD=your_strong_password
#        DOMAIN=syncdoc.yourdomain.com
#   2. Obtain SSL certs first:
#        certbot certonly --standalone -d syncdoc.yourdomain.com
#   3. Update nginx/nginx.conf — replace syncdoc.yourdomain.com with your domain
#
# Start:  docker-compose up -d --build
# Logs:   docker-compose logs -f app1 app2
# Stop:   docker-compose down

version: '3.8'

# Shared environment variables — avoids repetition between app1 and app2.
# SERVER_ID is set per-service below so Prometheus can label metrics by instance.
x-app-env: &app-env
  NODE_ENV: production
  PORT: 3001
  DATABASE_URL: postgresql://syncdoc:${POSTGRES_PASSWORD:-syncdoc}@postgres:5432/syncdoc
  REDIS_URL: redis://redis:6379
  CLIENT_ORIGIN: https://${DOMAIN:-localhost}

services:
  # ── Nginx load balancer ──────────────────────────────────────────────────────
  # Handles SSL termination, ip_hash sticky sessions for WebSocket,
  # and round-robin for REST API calls.
  nginx:
    image: nginx:1.25-alpine
    container_name: syncdoc_nginx
    ports:
      - "80:80"
      - "443:443"
    volumes:
      - ./nginx/nginx.conf:/etc/nginx/nginx.conf:ro
      - /etc/letsencrypt:/etc/letsencrypt:ro
      - nginx_logs:/var/log/nginx
    depends_on:
      - app1
      - app2
    restart: unless-stopped
    networks:
      - internal

  # ── App container 1 ─────────────────────────────────────────────────────────
  app1:
    build: .
    container_name: syncdoc_app1
    environment:
      <<: *app-env
      SERVER_ID: app1
    depends_on:
      postgres:
        condition: service_healthy
      redis:
        condition: service_healthy
    restart: unless-stopped
    networks:
      - internal

  # ── App container 2 ─────────────────────────────────────────────────────────
  app2:
    build: .
    container_name: syncdoc_app2
    environment:
      <<: *app-env
      SERVER_ID: app2
    depends_on:
      postgres:
        condition: service_healthy
      redis:
        condition: service_healthy
    restart: unless-stopped
    networks:
      - internal

  # ── PostgreSQL ───────────────────────────────────────────────────────────────
  postgres:
    image: postgres:16-alpine
    container_name: syncdoc_postgres
    environment:
      POSTGRES_DB: syncdoc
      POSTGRES_USER: syncdoc
      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-syncdoc}
    volumes:
      - postgres_data:/var/lib/postgresql/data
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U syncdoc"]
      interval: 5s
      timeout: 5s
      retries: 10
    restart: unless-stopped
    networks:
      - internal

  # ── Redis ─────────────────────────────────────────────────────────────────────
  redis:
    image: redis:7-alpine
    container_name: syncdoc_redis
    command: redis-server --appendonly yes --maxmemory 256mb --maxmemory-policy allkeys-lru
    volumes:
      - redis_data:/data
    healthcheck:
      test: ["CMD", "redis-cli", "ping"]
      interval: 5s
      timeout: 3s
      retries: 10
    restart: unless-stopped
    networks:
      - internal

volumes:
  postgres_data:
  redis_data:
  nginx_logs:

networks:
  internal:
    driver: bridge