### ===================
  ### ZOOKEEPER SERVICE
  ### ===================
  zookeeper:
    image: confluentinc/cp-zookeeper:latest
    restart: "always"
    environment:
      - ZOOKEEPER_SERVER_ID=1
      - ZOOKEEPER_CLIENT_PORT=2181
      - ZOOKEEPER_TICK_TIMES=2000
      - ZOOKEEPER_INIT_LIMIT=5
      - ZOOKEEPER_SYNC_LIMIT=2
    ports:
      - 2181:2181
    volumes:
      - zk-data:/var/lib/zookeper/data
    networks:
      - docker_networks
  ### ====================
  ### KAFKA SERVICE
  ### ====================
  kafka:
    image: confluentinc/cp-kafka:latest
    restart: "always"
    environment:
      - KAFKA_BROKER_ID=1
      - KAFKA_ZOOKEEPER_CONNECT=zookeeper:2181
      - KAFKA_ADVERTISED_LISTENERS=PLAINTEXT://localhost:9092
      - KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR=1
    ports:
      - 9092:9092
    volumes:
      - kf-data:/var/lib/kafka/data
    networks:
      - docker_networks
    depends_on:
      - zookeeper