Java& Kafka：无法建立到节点999的连接。经纪人可能不可用 [英] Java & Kafka: Connection to node 999 could not be established. Broker may not be available

问题描述

我的docker-compose.yml是

My docker-compose.yml is

version: "2.1"
services:
  pg-master:
    image: postgres-9.6:3
    ports:
     - "5432:5432"
    environment:
     - VIRTUAL_HOST=postgres.local
  web:
    build: .
    links:
      - pg-master:postgres.local
    ports:
     - "8080:8080"
  zookeeper:
    image: jplock/zookeeper:3.4.6
    ports:
      - "2181:2181"
  kafka:
    image: wurstmeister/kafka:1.0.0
    ports:
      - "9092:9092"
    environment:
      - KAFKA_ADVERTISED_HOST_NAME=localhost
      - KAFKA_ADVERTISED_PORT=9092
      - KAFKA_CREATE_TOPICS=TestTopic1:3:1
      - KAFKA_ZOOKEEPER_CONNECT=zookeeper:2181
      - KAFKA_BROKER_ID=999
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock

在Web docker容器中，java kafka生产者：

In web docker container, the java kafka producer:

Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put("acks", "all");
props.put("retries", 0);
props.put("batch.size", 16384);
props.put("linger.ms", 1);
props.put("buffer.memory", 33554432);
props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
this.kafkaProducer = new KafkaProducer<String, String>(props);

但是，我得到了 [kafka-producer-network-thread | producer-2] WARN org.apache.kafka.clients.NetworkClient-[Producer clientId = producer-2]无法建立到节点-1的连接。经纪人可能不可用。

不知道为什么。任何建议欢迎。非常感谢。

NO idea why. any suggestions welcomed. Thanks very much.

更新

我可以通过 bin / kafka-console-consumer.sh --bootstrap-server localhost：9092 --topic TestTopic1 --from-beginning 和 bin / kafka-console -producer.sh --broker-list localhost：9092 --kafka docker容器内外的主题TestTopic1 。

什么是 localhost 是否在docker容器内？

what is localhost inside docker container?

UPDATE

现在，我将Kafka Java生产者配置的 KAFKA_ADVERTISED_HOST_NAME 和 bootstrap.servers 手动更改为docker host ip （由 ifconfig 获取）。
现在，它正在工作。现在，我不知道如何通过程序或bash自动获取docker host ip并将其设置在docker-compose文件中。

Now, I changed the KAFKA_ADVERTISED_HOST_NAME and bootstrap.servers of Kafka Java producer config manually to the docker host ip (got by ifconfig). Now, it is working. Now, I have no idea how to get docker host ip and set it in docker-compose files automatically by program or bash.

推荐答案

我们能够通过将 / etc / hosts 从主机复制到Docker容器来解决此问题。显然Kubernetes DNS 服务在我们的设置中无法正常工作

We were able to resolve this issue by copying /etc/hosts from the host to the Docker container. Apparently Kubernetes DNS services were not correctly working on our setup.

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