Eureka 服务器和 UnknownHostException [英] Eureka server and UnknownHostException

问题描述

我已经安装了一个 Eureka 服务器并注册了一个叫做定价服务的服务.Eureka 仪表板显示UP 定价服务:4ac78ca47bdbebbb5fec98345c6232af0状态下.

I have installed an Eureka server and have registered a service called pricing-service. The Eureka dashboard shows UP pricing-service:4ac78ca47bdbebb5fec98345c6232af0 under status.

现在我有一个完全独立的 Spring Boot Web 服务，它调用(通过 WebClient 实例)定价服务为 http://pricing-service 但我得到 "reactor.core.Exceptions$ReactiveException: java.net.UnknownHostException:没有这样的主机是已知的(定价服务)"例外.

Now I have a completely separate Spring boot web service which calls (through a WebClient instance) the pricing-service as http://pricing-service but I get "reactor.core.Exceptions$ReactiveException: java.net.UnknownHostException: No such host is known (pricing-service)" exception.

所以控制器无法通过主机名找到定价服务.此外，控制器如何知道 Eureka 服务器以获取定价服务?Web 服务的 application.properties 中不应该有对它的引用吗?我在网上找不到任何内容.

So the Controller can't find the pricing-service by hostname.Further, how is the controller aware of the Eureka server in order to get to pricing-service? Shouldn't there be a reference to it in the application.properties of the web service? I couldn't find anything around the web.

推荐答案

现在我有一个完全独立的 Spring Boot Web 服务，它调用(通过 WebClient 实例)定价服务为 http://pricing-service

Now I have a completely separate Spring boot web service which calls (through a WebClient instance) the pricing-service as http://pricing-service

1. 您的此单独服务(WebClient 服务)还必须向 Eureka Server 注册.
2. 默认情况下，webclient 不知道必须使用 load-balancer 来调用其他 eureka 实例.

1. This separate service (the WebClient Service) of yours must also register itself with Eureka Server.
2. By default, webclient is not aware of having to use load-balancer to make calls to other eureka instances.

这是启用此类 WebClient bean 的一种方法:

Here is one of the ways to enable such a WebClient bean:

@Configuration
public class MyBeanConfig {

 @Bean
 WebClient webClient(LoadBalancerClient lbClient) {
    return WebClient.builder()
             .filter(new LoadBalancerExchangeFilterFunction(lbClient))
             .build();
    }

}

然后，您可以使用此 webClient bean 进行调用:

Then, you can use this webClient bean to make calls as:

@Component
public class YourClient {

 @Autowired
 WebClient webClient;

 public Mono<ResponseDto> makeCall() {

    return webClient
            .get()
            .uri("http://pricing-service/")
            // <-- change your body and subscribe to result
}

注意:初始化WebClient的Bean可以进一步探索这里.

Note: Initializing a Bean of WebClient can be explored further here.

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