无法从容器外部运行的Spring Boot应用程序连接到容器中运行的Kafka
我通过以下方式在本地运行kafka:
docker-compose.yml
zookeeper: image: 'bitnami/zookeeper:latest'
ports:
- 2181:2181
environment:
- ALLOW_ANONYMOUS_LOGIN=yes
kafka:
image: 'bitnami/kafka:latest'
ports:
- 9092:9092
environment:
- KAFKA_ZOOKEEPER_CONNECT=zookeeper:2181
- ALLOW_PLAINTEXT_LISTENER=yes
- KAFKA_ADVERTISED_PORT=9092
- KAFKA_ADVERTISED_LISTENERS=PLAINTEXT://localhost:9092
我的Spring Boot" title="Spring Boot">Spring Boot应用程序运行于:
application.yml:
spring: application:
name: testkafka
kafka:
bootstrap-servers: localhost:9092
server:
port: 8080
当我运行它并尝试发送到有关kafka的主题时,我得到:
org.springframework.kafka.KafkaException: Reply timed out at org.springframework.kafka.requestreply.ReplyingKafkaTemplate.lambda$sendAndReceive$0(ReplyingKafkaTemplate.java:196) ~[spring-kafka-2.1.10.RELEASE.jar:2.1.10.RELEASE]
at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54) ~[spring-context-5.0.10.RELEASE.jar:5.0.10.RELEASE]
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) ~[na:na]
at java.base/java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:264) ~[na:na]
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java) ~[na:na]
at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304) ~[na:na]
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na]
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na]
at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]
如果我从一个docker容器内部运行spring boot(使用一个docker compose文件),那么它 确实可以 工作:
以相同的方式运行两个:
version: "3.0"services:
service1:
build: ./Service
ports:
- 8080:8080
- 5005:5005
links:
- zookeeper
- kafka
zookeeper:
image: 'bitnami/zookeeper:latest'
ports:
- 2181:2181
environment:
- ALLOW_ANONYMOUS_LOGIN=yes
kafka:
image: 'bitnami/kafka:latest'
ports:
- 9092:9092
environment:
- KAFKA_ZOOKEEPER_CONNECT=zookeeper:2181
- ALLOW_PLAINTEXT_LISTENER=yes
- KAFKA_ADVERTISED_PORT=9092
- KAFKA_ADVERTISED_LISTENERS=PLAINTEXT://localhost:9092
如何获取kafka容器以允许来自外部本身/ docker的连接?
kafka: image: 'bitnami/kafka:latest'
ports:
- 9092:9092
environment:
- KAFKA_ZOOKEEPER_CONNECT=zookeeper:2181
- ALLOW_PLAINTEXT_LISTENER=yes
- KAFKA_ADVERTISED_PORT=9092
- KAFKA_ADVERTISED_LISTENERS=PLAINTEXT://kafka:9092
和:
spring: application:
name: testkafka
kafka:
bootstrap-servers: kafka:9092
server:
port: 8080
这仍然超时
回答:
如果我从docker容器内部运行spring boot(使用一个docker compose文件),那么它确实起作用
实际上,它不应该工作。Kafka并未作为应用程序的一部分运行,因此本节未针对Kafka容器。
kafka: bootstrap-servers: localhost:9092
它必须kafka:9092
在Docker网络中。
在Docker网络的内部和外部,通过指定KAFKA_ADVERTISED_LISTENERS=PLAINTEXT://localhost:9092
,表示您的客户端收到的Kafka引导程序连接为localhost:9092
,该连接仅在您进行端口转发并且您的容器在localhost上运行时才在Docker网络外部起作用,然而,多克尔网络内部,如前所述,本地主机将意味着
该 应用程序容器,而不是经纪人。
解决方案是通过该属性创建两个端口映射,如本博客文章中详细讨论的那样
另外,Confluent提供了一个完整配置的Docker Compose,其中包含适用于Docker内部和外部的适当映射
ports: - "9092:9092"
- "29092:29092"
environment:
KAFKA_BROKER_ID: 1
KAFKA_ZOOKEEPER_CONNECT: 'zookeeper:2181'
ALLOW_PLAINTEXT_LISTENER: "yes"
KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: PLAINTEXT:PLAINTEXT,PLAINTEXT_HOST:PLAINTEXT
KAFKA_LISTENERS: PLAINTEXT://:9092,PLAINTEXT_HOST://:29092
KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://kafka:9092,PLAINTEXT_HOST://localhost:29092
对于Docker网络中的应用程序,请使用kafka:9092
,对于外部的应用程序,请使用
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