使用Docker(k8s)安装Kafka并使用宿主机连接

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发布于 2022-09-25 10:58:05

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发布于 2022-09-25 10:58:05

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使用Docker（k8s）安装Kafka并使用宿主机连接

安装Docker及docker-compose 具体安装方法可以去官网看教程检查docker-compose是否安装成功

创建 docker-compose.yml 文件

version: '2'
services:
  zookeeper:
    image: "zookeeper"
    hostname: "zookeeper.local"
    container_name: "zookeeper"
    #设置网络别名 可随意取
    networks:
      local:
        aliases:
          - "zookeeper.local"
  kafka:
    image: "wurstmeister/kafka"
    hostname: "kafka.local"
    container_name: "kafka"
    ports:
      - "9092:9092"
    networks:
      local:
        aliases:
          - "kafka.local"
    environment:
      KAFKA_ADVERTISED_HOST_NAME: kafka.local
      KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
#设置网络，名为local模式
networks:
  local:
    driver: bridge

进入Kafka容器

docker exec -it kafka /bin/bash

创建Topic

/opt/kafka_2.13-2.7.0/bin/kafka-topics.sh --create --zookeeper zookeeper:2181 -replication-factor 1 --partitions 1 --topic test_topic

测试命令行生产消费

生产者

/opt/kafka_2.13-2.7.0/bin/kafka-console-producer.sh --broker-list kafka.local:9092 --topic test_topic

消费者

/opt/kafka_2.13-2.7.0/bin/kafka-console-consumer.sh --bootstrap-server kafka.local:9092 --topic test_top
ic --from-beginning

从宿主机使用代码连接Kafka 6.1 进入Zookeeper容器查看brokers注册信息

# 进入容器
docker exec -it zookeeper /bin/bash

# 进入zookeeper命令行
bin/zkCli.sh

6.2 查看brokers注册信息

get /brokers/ids/1001

6.3 配置宿主机hosts

# 添加
127.0.0.1	kafka.local

6.4 使用Java代码连接Kafka

public class KafkaConsumerDemo { 
     
public static void main(String[] args) { 
     
	//1.配置消费者连接属性
	Properties props = new Properties();
	props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "kafka.local:9092");
	props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
	props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
	props.put(ConsumerConfig.GROUP_ID_CONFIG, "test_demo");


	//2.创建Kafka消费者
	KafkaConsumer<String, String> consumer = new KafkaConsumer<String, String>(props);

	//3.订阅topics
	consumer.subscribe(Arrays.asList("test_topic"));
// consumer.assign(Arrays.asList(new TopicPartition("test_topic", 0)));
// consumer.seekToBeginning(Arrays.asList(new TopicPartition("test_topic", 0)));//不改变当前offset

	//4.死循环读取消息
	for (; ; ) { 
     
		ConsumerRecords<String, String> records = consumer.poll(Duration.ofSeconds(1));

		if (records != null && !records.isEmpty()) { 
     
			records.forEach(r -> { 
     
				System.out.println("key:" + r.key() + "----value:" + r.value());
			});
		}
	}
  }
}

测试成功