容器启动时应用程序未正确解析Docker别名

我正在创建两个docker compose文件（主要是因为我不想在开发应用程序时不断重新启动我的基础设施），它们需要驻留在同一docker网络上，以便使用别名进行连接

这些文件看起来类似于以下内容：

应用程序：

version: '3.5'

networks:
  default:
    name: kafka_network
    driver: bridge
services:
  client:
    build:
      context: .
      dockerfile: ./Dockerfile
    working_dir: /app/
    command: ./client
    environment:
      BADDR: kafka:9092
      CGROUP: test_group
      TOPICS: my-topic

version: '3.5'

networks:
  default:
    name: kafka_network
    driver: bridge

services:
  zookeeper:
    image: confluentinc/cp-zookeeper:latest
    ports:
      - 2181:2181
    environment:
      ZOOKEEPER_CLIENT_PORT: 2181
      ZOOKEEPER_TICK_TIME: 2000

  kafka:
    image: confluentinc/cp-kafka:latest
    depends_on:
      - zookeeper
    ports:
      - 9092:9092
    environment:
      KAFKA_BROKER_ID: 1
      KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
      KAFKA_ADVERTISED_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_OFFSETS_TOPIC_REPLICATION_FACTOR: 1

Broker:  kafka:9092
Consumer_Group:  my_group
Topics:  [my-topic]
Created Consumer rdkafka#consumer-1
% Error: GroupCoordinator: Connect to ipv4#127.0.0.1:9092 failed: Connection refused (after 0ms in state CONNECT)

[procyclinsur@P-428 client]$ ./client
Broker:  localhost:9092
Consumer_Group:  my-group
Topics:  [my-topic]
Created Consumer rdkafka#consumer-1
% AssignedPartitions: [my-topic[0]@unset]
% Message on my-topic[0]@0:
hello mate

基础设施：

version: '3.5'

networks:
  default:
    name: kafka_network
    driver: bridge
services:
  client:
    build:
      context: .
      dockerfile: ./Dockerfile
    working_dir: /app/
    command: ./client
    environment:
      BADDR: kafka:9092
      CGROUP: test_group
      TOPICS: my-topic

version: '3.5'

networks:
  default:
    name: kafka_network
    driver: bridge

services:
  zookeeper:
    image: confluentinc/cp-zookeeper:latest
    ports:
      - 2181:2181
    environment:
      ZOOKEEPER_CLIENT_PORT: 2181
      ZOOKEEPER_TICK_TIME: 2000

  kafka:
    image: confluentinc/cp-kafka:latest
    depends_on:
      - zookeeper
    ports:
      - 9092:9092
    environment:
      KAFKA_BROKER_ID: 1
      KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
      KAFKA_ADVERTISED_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_OFFSETS_TOPIC_REPLICATION_FACTOR: 1

Broker:  kafka:9092
Consumer_Group:  my_group
Topics:  [my-topic]
Created Consumer rdkafka#consumer-1
% Error: GroupCoordinator: Connect to ipv4#127.0.0.1:9092 failed: Connection refused (after 0ms in state CONNECT)

[procyclinsur@P-428 client]$ ./client
Broker:  localhost:9092
Consumer_Group:  my-group
Topics:  [my-topic]
Created Consumer rdkafka#consumer-1
% AssignedPartitions: [my-topic[0]@unset]
% Message on my-topic[0]@0:
hello mate

我的问题是客户没有正确解析卡夫卡：9092。。。它总是解析为

127.0.0.1:9092

错误：

version: '3.5'

networks:
  default:
    name: kafka_network
    driver: bridge
services:
  client:
    build:
      context: .
      dockerfile: ./Dockerfile
    working_dir: /app/
    command: ./client
    environment:
      BADDR: kafka:9092
      CGROUP: test_group
      TOPICS: my-topic

version: '3.5'

networks:
  default:
    name: kafka_network
    driver: bridge

services:
  zookeeper:
    image: confluentinc/cp-zookeeper:latest
    ports:
      - 2181:2181
    environment:
      ZOOKEEPER_CLIENT_PORT: 2181
      ZOOKEEPER_TICK_TIME: 2000

  kafka:
    image: confluentinc/cp-kafka:latest
    depends_on:
      - zookeeper
    ports:
      - 9092:9092
    environment:
      KAFKA_BROKER_ID: 1
      KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
      KAFKA_ADVERTISED_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_OFFSETS_TOPIC_REPLICATION_FACTOR: 1

Broker:  kafka:9092
Consumer_Group:  my_group
Topics:  [my-topic]
Created Consumer rdkafka#consumer-1
% Error: GroupCoordinator: Connect to ipv4#127.0.0.1:9092 failed: Connection refused (after 0ms in state CONNECT)

[procyclinsur@P-428 client]$ ./client
Broker:  localhost:9092
Consumer_Group:  my-group
Topics:  [my-topic]
Created Consumer rdkafka#consumer-1
% AssignedPartitions: [my-topic[0]@unset]
% Message on my-topic[0]@0:
hello mate

当在本地运行时，它似乎运行良好，所以我真的很困惑问题可能是什么。如果有人知道这件事，我将非常感激

本地：

version: '3.5'

networks:
  default:
    name: kafka_network
    driver: bridge
services:
  client:
    build:
      context: .
      dockerfile: ./Dockerfile
    working_dir: /app/
    command: ./client
    environment:
      BADDR: kafka:9092
      CGROUP: test_group
      TOPICS: my-topic

version: '3.5'

networks:
  default:
    name: kafka_network
    driver: bridge

services:
  zookeeper:
    image: confluentinc/cp-zookeeper:latest
    ports:
      - 2181:2181
    environment:
      ZOOKEEPER_CLIENT_PORT: 2181
      ZOOKEEPER_TICK_TIME: 2000

  kafka:
    image: confluentinc/cp-kafka:latest
    depends_on:
      - zookeeper
    ports:
      - 9092:9092
    environment:
      KAFKA_BROKER_ID: 1
      KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
      KAFKA_ADVERTISED_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_OFFSETS_TOPIC_REPLICATION_FACTOR: 1

Broker:  kafka:9092
Consumer_Group:  my_group
Topics:  [my-topic]
Created Consumer rdkafka#consumer-1
% Error: GroupCoordinator: Connect to ipv4#127.0.0.1:9092 failed: Connection refused (after 0ms in state CONNECT)

[procyclinsur@P-428 client]$ ./client
Broker:  localhost:9092
Consumer_Group:  my-group
Topics:  [my-topic]
Created Consumer rdkafka#consumer-1
% AssignedPartitions: [my-topic[0]@unset]
% Message on my-topic[0]@0:
hello mate

---

这是一个与卡夫卡配置相关的问题——根本不是docker的问题

看看：

  KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://kafka:29092,PLAINTEXT_HOST://localhost:9092

这意味着您为您的卡夫卡设置了2个侦听器，您的客户端在连接时将以卡夫卡协议接收这些侦听器

因此，当您在端口9092上连接时，您的客户端将尝试在“本地主机”上获取Kafka，当您在端口29092上连接时，您的客户端将尝试在“Kafka”DNS名称上获取Kafka

它在本地为您工作，因为您的Kafka容器通过docker ports部分在localhost:9092上公开

这篇文章很好地描述了这个主题：