Kafka容器在容器内和容器外使用相同的主机名连接的问题

1. 在docker-compose.yaml文件中定义Kafka服务：

version: '3' services: zookeeper: image: 'bitnami/zookeeper:latest' ports: - '2181:2181' environment: - ALLOW_ANONYMOUS_LOGIN=yes kafka: image: 'bitnami/kafka:latest' ports: - '9092:9092' environment: - KAFKA_CFG_ZOOKEEPER_CONNECT=zookeeper:2181 - ALLOW_PLAINTEXT_LISTENER=yes - KAFKA_CFG_LISTENER_SECURITY_PROTOCOL_MAP=PLAINTEXT:PLAINTEXT,PLAINTEXT_HOST:PLAINTEXT - KAFKA_CFG_LISTENERS=PLAINTEXT://:9092,PLAINTEXT_HOST://:29092 - KAFKA_CFG_ADVERTISED_LISTENERS=PLAINTEXT://kafka:9092,PLAINTEXT_HOST://localhost:29092 - KAFKA_CFG_AUTO_CREATE_TOPICS_ENABLE=true

2. 在容器内部使用以下代码连接Kafka服务：

import org.apache.kafka.clients.producer.KafkaProducer; import org.apache.kafka.clients.producer.ProducerRecord; import java.util.Properties;

public class KafkaTest { public static void main(String[] args) { Properties props = new Properties(); props.put("bootstrap.servers", "kafka: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");

    KafkaProducer<String, String> producer = new KafkaProducer<>(props);
    for (int i = 0; i < 100; i++) {
        String msg = "Message " + i;
        producer.send(new ProducerRecord<String, String>("test", msg));
    }

    producer.close();
}

}

3. 在容器外部使用以下代码连接Kafka服务：

import org.apache.kafka.clients.consumer.ConsumerRecords; import org.apache.kafka