Spring 微服务在 Docker 容器内时无法通过 Eureka 连接

Question

所以我一直在尝试解决这个问题，4天后我仍然没有找到解决办法。我已经使用 Spring Boot 构建了一个 API 网关，它通过 Zuul 作为 Eureka 服务器，我有一个微服务作为 Eureka 客户端。当我运行它在 Intellij 中本地时，一切都完美无缺，它们发现并相互连接。但是，当它们在容器中时，出现以下异常：

2022-05-16 12:42:49.087 WARN 1 --- [nfoReplicator-0] c.n.d.s.t.d.RetryableEurekaHttpClient : Request execution failed with m essage: java.net.UnknownHostException: http 2022-05-16 12:42:49.088 WARN 1 --- [nfoReplicator-0] com.netflix.discovery.DiscoveryClient : DiscoveryClient_USER/8322e6fdb2 35:user:8082 - registration failed Cannot execute request on any known server

com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:112 ) ~[eureka-client-1.9.17.jar!/:1.9.17] at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56 ) ~[eureka-client-1.9.17.jar!/:1.9.17] at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.execute(EurekaHttpClientDecorator.java:5 9) ~[eureka-client-1.9.17.jar!/:1.9.17] at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) ~[eureka-client-1.9.17.jar!/:1.9.17] at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56 ) ~[eureka-client-1.9.17.jar!/:1.9.17] at com.netflix.discovery.DiscoveryClient.register(DiscoveryClient.java:850) ~[eureka-client-1.9.17.jar!/:1.9.17] at com.netflix.discovery.InstanceInfoReplicator.run(InstanceInfoReplicator.java:121) [eureka-client-1.9.17.jar!/:1.9.17] at com.netflix.discovery.InstanceInfoReplicator.run(InstanceInfoReplicator.java:101) [eureka-client-1.9.17.jar!/:1.9.1 7] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_332] at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_332] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access1(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_332] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [na:1. 8.0_332] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_332] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_332] at java.lang.Thread.run(Thread.java:750) [na:1.8.0_332]

我的尤里卡服务器是这样的：

Docker-compose.yaml

version: '3.8'
services:

  kwettergateway-docker:
    image: user/kwettergateway
    ports:
      - "8761:8761"
  userservice-docker:
    image: user/userservice
    ports:
      - "8082:8082"
    links:
      - kwettergateway-docker

Application.properties:

server.port=8761

#Gateway properties
spring.application.name=gateway
eureka.instance.prefer-ip-address=true
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false
eureka.server.wait-time-in-ms-when-sync-empty=0
zuul.prefix=/api
zuul.routes.user.path=/user/**
zuul.routes.user.url=http://localhost:8082/

Docker文件:

FROM openjdk:8
EXPOSE 8080
ADD target/kwettergateway-docker.jar kwettergateway-docker.jar
ENTRYPOINT ["java", "-jar", "/kwettergateway-docker.jar"]

我的尤里卡客户端看起来像这样：

Application.properties:

server.port=8082

#Gateway properties
spring.application.name=user
eureka.instance.prefer-ip-address=true
eureka.client.register-with-eureka=true
eureka.client.fetch-registry=true
eureka.client.serviceUrl.defaultZone=http://localhost:8761/eureka/

Answer 1

您试图运行您的应用程序使用 Docker，因此在您的 application.properties 文件中您应该将 localhost 替换为图像名称。另外，需要注意的是，你应该用 @EnableEurekaServer 标记你的 Eureka 服务器。如果您想查看它，请访问 - https://github.com/zhurasique/easycar

Answer 2

我不得不使用 docker 主机而不是本地主机。所以它现在可以使用以下代码：

eureka.client.serviceUrl.defaultZone=http://host.docker.internal:8761/eureka/

Spring 微服务在 Docker 容器内时无法通过 Eureka 连接

Spring Microservices Cannot Connect Via Eureka When Inside Docker Container

java

spring

spring-boot

docker

netflix-eureka