这个问题在这里已经有答案了：

连接Kafka在docker中跑步（3个答案）
4个月前关门了。
我使用bitnami-kafka和zookeeper设置了一个kafka集群，我想使用kafdrop查看这个集群或至少一个代理。我使用docker compose构建所有组件。我最初遵循本教程，然后在docker-compose.yml中添加了kafdrop配置

version: '2'

networks:
  kafka-net:
    driver: bridge

services:
  zookeeper-server:
    image: 'bitnami/zookeeper:latest'
    networks:
      - kafka-net
    ports:
      - '2181:2181'
    environment:
      - ALLOW_ANONYMOUS_LOGIN=yes
  kafdrop:
    image: obsidiandynamics/kafdrop
    networks:
      - kafka-net
    restart: "no"
    ports:
      - "9000:9000"
    environment:
      KAFKA_BROKERCONNECT: "PLAINTEXT://localhost:9092,PLAINTEXT://localhost:9093,PLAINTEXT://localhost:9094"
      JVM_OPTS: "-Xms16M -Xmx48M -Xss180K -XX:-TieredCompilation -XX:+UseStringDeduplication -noverify"
    depends_on:
      - "kafka-server1"
      - "kafka-server2"
      - "kafka-server3"
  kafka-server1:
    image: 'bitnami/kafka:latest'
    networks:
      - kafka-net    
    ports:
      - '9092:9092'
    environment:
      - KAFKA_CFG_ZOOKEEPER_CONNECT=zookeeper-server:2181
      - KAFKA_CFG_ADVERTISED_LISTENERS=PLAINTEXT://localhost:9092
      - ALLOW_PLAINTEXT_LISTENER=yes
    depends_on:
      - zookeeper-server
  kafka-server2:
    image: 'bitnami/kafka:latest'
    networks:
      - kafka-net    
    ports:
      - '9093:9092'
    environment:
      - KAFKA_CFG_ZOOKEEPER_CONNECT=zookeeper-server:2181
      - KAFKA_CFG_ADVERTISED_LISTENERS=PLAINTEXT://localhost:9093
      - ALLOW_PLAINTEXT_LISTENER=yes
    depends_on:
      - zookeeper-server
  kafka-server3:
    image: 'bitnami/kafka:latest'
    networks:
      - kafka-net    
    ports:
      - '9094:9092'
    environment:
      - KAFKA_CFG_ZOOKEEPER_CONNECT=zookeeper-server:2181
      - KAFKA_CFG_ADVERTISED_LISTENERS=PLAINTEXT://localhost:9094
      - ALLOW_PLAINTEXT_LISTENER=yes
    depends_on:
      - zookeeper-server

我的主要问题是kafdrop总是抛出以下错误：

020-08-26 10:53:53.517  WARN 1 [| kafdrop-admin] o.a.k.c.NetworkClient                    : [AdminClient clientId=kafdrop-admin] Connection to node -3 (localhost/127.0.0.1:9094) could not be established. Broker may not be available.
2020-08-26 10:53:53.522  WARN 1 [| kafdrop-admin] o.a.k.c.NetworkClient                    : [AdminClient clientId=kafdrop-admin] Connection to node -2 (localhost/127.0.0.1:9093) could not be established. Broker may not be available.
2020-08-26 10:53:53.526  WARN 1 [| kafdrop-admin] o.a.k.c.NetworkClient                    : [AdminClient clientId=kafdrop-admin] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available.
2020-08-26 10:53:53.627  WARN 1 [| kafdrop-admin] o.a.k.c.NetworkClient                    : [AdminClient clientId=kafdro

我试过改变 KAFKA_BROKERCONNECT 但都不起作用。
plaintext://localhost:9092,plaintext://localhost:9093,plaintext://localhost:9094
localhost:9092,localhost:9093,localhost:9094
plaintext://kafka-server1:9092,plaintext://kafka-server2:9093,plaintext://kafka-server3:9094
Kafka服务器1:9092、Kafka服务器2:9093、Kafka服务器3:9094
实际上，我只是猜测正确的配置语法，所以任何与此相关的解释都是值得赞赏的：）。
此外，还添加了 networks kafdrop配置需要属性吗？kafdrop有示例docker compose文件，而这个文件没有网络配置，所以我想知道为什么/如果 network 是需要的。