Kubernetes集群-无法从多VM k8s集群中另一个pod中运行的Spring Boot服务访问pod中正在运行的Kafka代理

Question

我有一个在多VM环境中运行的Kafka代理（私有云-带有我们自己的库伯内特斯集群-4节点集群）。

我创建了一个spring-boot应用程序，它有一个发布者，必须在Kafka代理中向Kafka主题发布消息。我有两个集装箱（Kafka经纪人

我无法通过在发布者的bootstrap.servers中提供Kafka的服务名称：端口ID来访问Kafka代理（在同一个k8s集群中运行）

Spring boot的发布者配置：

 props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, "kafka-svc:9092");- -> not working 

集群信息：

kafka broker yaml文件：

    apiVersion: extensions/v1beta1
    kind: Deployment
    metadata:
      name: kafka-deploy
    spec:
      replicas: 1
      selector:
        matchLabels:
          app: kafka
      template:
        metadata:
          labels:
            app: kafka
        spec:
          containers:
          - env:
            - name: KAFKA_PORT
              value: "9092"
            - name: KAFKA_ADVERTISED_PORT
              value: "9092"
            - name: KAFKA_ADVERTISED_HOST_NAME
              value: kafka-svc
            - name: KAFKA_CREATE_TOPICS
              value: "test:1:1"
            - name: KAFKA_ZOOKEEPER_CONNECT
              value: zookeeper-svc:2181
            - name: KAFKA_BROKER_ID
              value: "1"
            name: kafka
            image: wurstmeister/kafka
            ports:
            - containerPort: 9092
    ------
       apiVersion: v1
       kind: Service
       metadata:
         name: kafka-svc
       spec:
         type: NodePort
         ports:
         - port: 9092
           targetPort: 9092
           name: http
           protocol: TCP
         selector:
           app: kafka
           kafka-broker-id: "1"

当我试图将字符串消息推送到Kafka主题时，我得到了以下异常：

"2020-08-18 13:28:04.525  INFO 1 --- [nio-8080-exec-1] o.a.kafka.common.utils.AppInfoParser     : Kafka startTimeMs: 1597757284523
2020-08-18 13:29:04.539 ERROR 1 --- [nio-8080-exec-1] o.s.k.support.LoggingProducerListener    : Exception thrown when sending a message with key='null' and payload='TEST' to topic test:

org.apache.kafka.common.errors.TimeoutException: Topic test not present in metadata after 60000 ms.

2020-08-18 13:29:04.544 ERROR 1 --- [nio-8080-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.kafka.KafkaException: Send failed; nested exception is org.apache.kafka.common.errors.TimeoutException: Topic test not present in metadata after 60000 ms.] with root cause

Answer 1

看起来您需要先创建test主题，然后才能发布任何内容。

您可以查看该主题在 Kafka 集群中是否可用。例如，来自Kafka经纪人播客之一：

bin/kafka-topics.sh --bootstrap-server localhost:9092 --zookeeper zookeeper-svc:2181 --topic test --describe

或者，您可以在Spring启动应用程序上创建它：

package io.stockgeeks.kafka.config;

import org.apache.kafka.clients.admin.NewTopic;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.kafka.config.TopicBuilder;

@Configuration
public class KafkaTopicConfiguration {
  
  @Bean
  public NewTopic topicExample() {
    return TopicBuilder.name("test")
      .partitions(6)
      .replicas(3)
      .build();
  }
}

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