无法从另一个docker容器连接到kafka docker容器

Question

我正在尝试从另一个码头工人容器连接到 kafka docker 容器。但它没有连接。

为了运行kafka和zookeeper，我使用了docker compose文件：

version: '2'
services:
  zookeeper:
    image: "confluentinc/cp-zookeeper:latest"
    environment:
      ZOOKEEPER_CLIENT_PORT: 2181
      ZOOKEEPER_TICK_TIME: 2000

# This has three listeners you can experiment with. 
# BOB for internal traffic on the Docker network
# FRED for traffic from the Docker-host machine (`localhost`)
# ALICE for traffic from outside, reaching the Docker host on the DNS name `never-gonna-give-you-up`
# Use 
  kafka0:
    image: "confluentinc/cp-kafka"
    ports:
      - '9092:9092'
      - '29094:29094'
    depends_on:
      - zookeeper
    environment:
      KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
      KAFKA_LISTENERS: LISTENER_BOB://kafka0:29092,LISTENER_FRED://kafka0:9092,LISTENER_ALICE://kafka0:29094
      KAFKA_ADVERTISED_LISTENERS: LISTENER_BOB://kafka0:29092,LISTENER_FRED://localhost:9092,LISTENER_ALICE://never-gonna-give-you-up:29094
      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: LISTENER_BOB:PLAINTEXT,LISTENER_FRED:PLAINTEXT,LISTENER_ALICE:PLAINTEXT
      KAFKA_INTER_BROKER_LISTENER_NAME: LISTENER_BOB
      KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1

容器docker compose 17138956372294708100 _ kafkatest . producer _ 1和docker compose 17138956372294708100 _ kafkatest . consumer _ 1用于生成和消费消息。当容器docker compose 17138956372294708100 _ kafkatest . producer _ 1尝试使用bootstrap.servers参数(localhost:9092或never-got-to-give-you-up:29094)连接到kafka集群时，它显示错误

%7|1569945335.015|BROKERFAIL|rdkafka#producer-1| [thrd:never-gonna-give-you-up:29094/bootstrap]: never-gonna-give-you-up:29094/bootstrap: failed: err: Local: Host resolution failure: (errno: Bad address)
%3|1569945335.015|FAIL|rdkafka#producer-1| [thrd:never-gonna-give-you-up:29094/bootstrap]: never-gonna-give-you-up:29094/bootstrap: Failed to resolve 'never-gonna-give-you-up:29094': Name or service not known (after 1656ms in state CONNECT)
%3|1569945335.015|ERROR|rdkafka#producer-1| [thrd:never-gonna-give-you-up:29094/bootstrap]: never-gonna-give-you-up:29094/bootstrap: Failed to resolve 'never-gonna-give-you-up:29094': Name or service not known (after 1656ms in state CONNECT)
%7|1569945335.015|STATE|rdkafka#producer-1| [thrd:never-gonna-give-you-up:29094/bootstrap]: never-gonna-give-you-up:29094/bootstrap: Broker changed state CONNECT -> DOWN
%3|1569945335.015|ERROR|rdkafka#producer-1| [thrd:never-gonna-give-you-up:29094/bootstrap]: 1/1 brokers are down

我该怎么修？

Answer 1

dockercompose1713895637294708100_Kafka特。producer1正在尝试使用引导连接到kafka集群。服务器参数（localhost:9902或永远不会放弃：29094）

从另一个 Docker 容器中，这两种方法都不正确。

>

永不放弃在Docker配置中作为主机名/DNS记录不存在于任何地方。基于错误，您的外部DNS服务器也不知道那是什么

localhost指的是Kafka客户端容器，而不是主机或代理容器。

根据您的组合配置，您需要连接到< code>kafka0主机/服务，它在端口29092上为< code>bootstrap.servers通告

# BOB for internal traffic on the Docker network
KAFKA_ADVERTISED_LISTENERS: LISTENER_BOB://kafka0:29092

您可能还应该删除LISTENER_ALICE，因为它不提供任何有用的连接细节，除非您的主机的外部主机名实际上是< code > never-got-to-give-you-up

您将希望将生产者和消费者作为合成文件的一部分

Answer 2

请尝试以下配置：

version: '3'
services:
  zookeeper:
    image: confluentinc/cp-zookeeper:latest
    ports:
      - "32181:32181"
    environment:
      ZOOKEEPER_CLIENT_PORT: 32181
      ZOOKEEPER_TICK_TIME: 2000

  kafka0:
    image: confluentinc/cp-kafka:latest
    ports:
     - "9090:9090"
    depends_on:
      - zookeeper
    environment:
      KAFKA_ZOOKEEPER_CONNECT: zookeeper:32181
      KAFKA_ADVERTISED_LISTENERS: LISTENER_INTERNAL://kafka0:29090,LISTENER_EXTERNAL://localhost:9090
      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: LISTENER_INTERNAL:PLAINTEXT,LISTENER_EXTERNAL:PLAINTEXT
      KAFKA_INTER_BROKER_LISTENER_NAME: LISTENER_INTERNAL
      KAFKA_AUTO_CREATE_TOPICS_ENABLE: "false"

使用此配置，如果从主机连接到代理的容器，则使用IPlocalhost:9090。如果从具有相同网络的其他容器连接，则使用kafka0:29090。