services:
  kafka:
    image: apache/kafka:4.0.0
    container_name: kafka-apache-kraft-410
    hostname: kafka-kraft
    ports:
      - "9092:9092" # 映射 Broker 端口
    environment:
      KAFKA_LOG4J_OPTS: "-Dlog4j.configurationFile=file:/opt/kafka/config/custom-log4j2.yaml"
      KAFKA_NODE_ID: 1
      KAFKA_PROCESS_ROLES: "broker,controller"

      # 2. 监听器配置
      KAFKA_LISTENERS: "PLAINTEXT://0.0.0.0:9092,CONTROLLER://0.0.0.0:9093"
      KAFKA_ADVERTISED_LISTENERS: "PLAINTEXT://localhost:9092"
      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: "CONTROLLER:PLAINTEXT,PLAINTEXT:PLAINTEXT"
      KAFKA_CONTROLLER_LISTENER_NAMES: "CONTROLLER"

      # 3. Controller 连接信息（单节点）
      KAFKA_CONTROLLER_QUORUM_VOTERS: "1@kafka-kraft:9093"

      KAFKA_LOG_DIRS: "/var/lib/kafka/data"

      # 为内部 topic __consumer_offsets 设置副本因子为 1
      KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
      # (可选，推荐) 事务状态 topic 的副本因子也设置为 1
      KAFKA_TRANSACTION_STATE_LOG_REPLICATION_FACTOR: 1
      KAFKA_TRANSACTION_STATE_LOG_MIN_ISR: 1
    volumes:
      - ./kafka-data:/var/lib/kafka/data # 数据持久化
      - ./log4j2.yaml:/opt/kafka/config/custom-log4j2.yaml:ro # 日志级别配置
    restart: always