docker-compose.yml

# ReadIssue overload-simulation lab.
# Built up across tasks; this revision covers Postgres + seeder (Task 1).
name: readissue

services:
  postgres:
    image: postgres:16-alpine
    environment:
      POSTGRES_USER: ${POSTGRES_USER}
      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
      POSTGRES_DB: ${POSTGRES_DB}
    volumes:
      - ./db/init:/docker-entrypoint-initdb.d:ro
      - pgdata:/var/lib/postgresql/data
    ports:
      - "5432:5432"
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER} -d ${POSTGRES_DB}"]
      interval: 2s
      timeout: 3s
      retries: 30
    networks:
      - lab

  # Read replica: an independent read-only Postgres copy. Because the dataset
  # is static after seeding, an identically-seeded copy behaves like a read
  # replica for the purpose of spreading read load.
  replica:
    image: postgres:16-alpine
    environment:
      POSTGRES_USER: ${POSTGRES_USER}
      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
      POSTGRES_DB: ${POSTGRES_DB}
    volumes:
      - ./db/init:/docker-entrypoint-initdb.d:ro
      - pgdata_replica:/var/lib/postgresql/data
    ports:
      - "5433:5432"
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER} -d ${POSTGRES_DB}"]
      interval: 2s
      timeout: 3s
      retries: 30
    networks:
      - lab

  seeder:
    build: ./seeder
    environment:
      POSTGRES_USER: ${POSTGRES_USER}
      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
      POSTGRES_DB: ${POSTGRES_DB}
      POSTGRES_HOST: ${POSTGRES_HOST}
      POSTGRES_PORT: ${POSTGRES_PORT}
      SEED_ROWS: ${SEED_ROWS}
    depends_on:
      postgres:
        condition: service_healthy
    networks:
      - lab
    restart: "no"

  redis:
    image: redis:7-alpine
    command: ["redis-server", "--save", "", "--maxmemory", "256mb", "--maxmemory-policy", "allkeys-lru"]
    ports:
      - "6379:6379"
    healthcheck:
      test: ["CMD", "redis-cli", "ping"]
      interval: 3s
      timeout: 3s
      retries: 10
    networks:
      - lab

  pgbouncer:
    image: edoburu/pgbouncer:v1.25.2-p0
    environment:
      DB_HOST: postgres
      DB_PORT: "5432"
      DB_USER: ${POSTGRES_USER}
      DB_PASSWORD: ${POSTGRES_PASSWORD}
      DB_NAME: ${POSTGRES_DB}
      LISTEN_PORT: "6432"
      AUTH_TYPE: scram-sha-256
      POOL_MODE: transaction
      MAX_CLIENT_CONN: "1000"
      DEFAULT_POOL_SIZE: "20"
      ADMIN_USERS: ${POSTGRES_USER}
    depends_on:
      postgres:
        condition: service_healthy
    networks:
      - lab

  traefik:
    # NOTE: the local Docker daemon is very new (min API 1.40). Traefik <= v3.3
    # pins Docker client API 1.24 and fails discovery against it; v3.7 negotiates
    # a modern API version correctly, so this version floor matters.
    image: traefik:v3.7
    command:
      # Docker provider: auto-discover containers by label.
      - --providers.docker=true
      - --providers.docker.exposedbydefault=false
      - --providers.docker.network=${LAB_NETWORK}
      # Ingress entrypoint used by the worker routers (entrypoints.web).
      - --entrypoints.web.address=:80
      # Insecure dashboard/API for the local lab.
      - --api.dashboard=true
      - --api.insecure=true
      - --ping=true
      - --accesslog=false
      - --log.level=INFO
    ports:
      - "${TRAEFIK_ENTRYPOINT_PORT}:80"    # load-balanced ingress -> workers
      - "${TRAEFIK_DASHBOARD_PORT}:8080"   # Traefik dashboard/API
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock:ro
    healthcheck:
      test: ["CMD", "traefik", "healthcheck", "--ping"]
      interval: 5s
      timeout: 3s
      retries: 10
    networks:
      - lab

  control-plane:
    build: ./control-plane
    environment:
      POSTGRES_USER: ${POSTGRES_USER}
      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
      POSTGRES_DB: ${POSTGRES_DB}
      POSTGRES_HOST: postgres
      POSTGRES_PORT: ${POSTGRES_PORT}
      COLLECTOR_PG_HOST: postgres
      REDIS_HOST: redis
      REDIS_PORT: ${REDIS_PORT}
      INGRESS_URL: http://traefik:80
      WORKER_IMAGE: ${WORKER_IMAGE}
      LAB_NETWORK: ${LAB_NETWORK}
      MAX_WORKERS: ${MAX_WORKERS}
      LOADGEN_PROCS: ${LOADGEN_PROCS:-8}
    volumes:
      # Needed to spawn/destroy worker containers on the lab network.
      - /var/run/docker.sock:/var/run/docker.sock
    ports:
      - "${CONTROL_PLANE_PORT}:8000"
    depends_on:
      postgres:
        condition: service_healthy
      redis:
        condition: service_healthy
      traefik:
        condition: service_started
    networks:
      - lab

  frontend:
    build: ./frontend
    ports:
      - "3000:80"
    depends_on:
      - control-plane
    networks:
      - lab

volumes:
  pgdata:
  pgdata_replica:

networks:
  lab:
    name: ${LAB_NETWORK}