Docker: 如何连接到 docker-compose.yml 文件中未定义的 kafka 容器

Docker: How to connect to a kafka container which is not defined in docker-compose.yml file

我有 3 个 docker-compose 文件。一个启动kafka,另外两个是消费者和生产者。在其他 docker-compose 文件中添加了 external_links 到 kafka,但仍然无法从容器内部访问 kafka。从容器外部,我可以通过 localhost:9092 访问,但是在 docker 容器内部呢?

# docker-compose1.yml
version: "3.6"
services:
  zookeeper:
    image: 'docker.io/bitnami/zookeeper:3.7'
    container_name: zookeeper
    ports:
      - '2181:2181'
    volumes:
      - 'zookeeper_data:/bitnami'
    environment:
      - ALLOW_ANONYMOUS_LOGIN=yes

  kafka:
    image: 'docker.io/bitnami/kafka:3'
    container_name: kafka
    ports:
      - '9092:9092'
    volumes:
      - 'kafka_data:/bitnami'
    environment:
      - KAFKA_CFG_ZOOKEEPER_CONNECT=zookeeper:2181
      - KAFKA_LISTENERS=PLAINTEXT://kafka:29092,PLAINTEXT_HOST://localhost:9092
      - KAFKA_LISTENER_SECURITY_PROTOCOL_MAP=PLAINTEXT:PLAINTEXT,PLAINTEXT_HOST:PLAINTEXT
      - KAFKA_INTER_BROKER_LISTENER_NAME=PLAINTEXT
      - KAFKA_ADVERTISED_LISTENERS=PLAINTEXT://kafka:29092,PLAINTEXT_HOST://localhost:9092
      - ALLOW_PLAINTEXT_LISTENER=yes
      - KAFKA_ADVERTISED_HOST_NAME=localhost
      - KAFKA_ADVERTISED_PORT=9092
      - KAFKA_AUTO_CREATE_TOPICS_ENABLE=true
    depends_on:
      - zookeeper


volumes:
  zookeeper_data:
    external: true
  kafka_data:
    external: true
# docker-compose2.yml
version: "3.6"
services:
  web:
    hostname: ocp-transmitter
    image: 'ocp/transmitter'
    command: bash -c "bundle install && foreman start"
    ports:
      - '3000:3000'
    volumes:
      - .:/app:cached
    stdin_open: true
    tty: true
    external_links:
      - kafka

首先,删除这些,它们已被弃用

  - KAFKA_ADVERTISED_HOST_NAME=localhost
  - KAFKA_ADVERTISED_PORT=9092

其次,更仔细地阅读bitnami图像文档,所有Kafka属性都以KAFKA_CFG_开头,然后阅读关于internal/external listeners

的部分

链接的答案正确

运行 docker network create 用一个名称来设置一个独立于 Compose 的外部桥接网络,然后将 networks 部分添加到该网络中的每个服务(Zookeeper、Kafka 和你的 Kafka客户)。然后确保它是外部的

networks:
  example-net:
    external: true

然后你会在你的应用程序中使用 kafka:29092,而不是本地主机,而不是端口 9092