无法使用spring云api网关

Question

我正在开发一个示例poc，并试图集成spring云api网关。

在我的pom.xml里

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.7.3</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.tek</groupId>
<artifactId>gatewayApplication</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>Gateway Application</name>
<description>Gateway Application for Spring Boot</description>
<properties>
    <java.version>1.8</java.version>
    <spring-cloud.version>2021.0.3</spring-cloud.version>
</properties>
<dependencies>
            <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-gateway</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
    </dependency>
</dependencies>
<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>${spring-cloud.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>

在我的application.yml里

       server:
  port: 9191

spring:
  application:
    name: API-GATEWAY
  cloud:
    gateway:
      routes:
        - id: DEPARTMENT-SERVICE
          uri: lb://DEPARTMENT-SERVICE
          predicates:
            - Path=/departments/**
        - id: USER-SERVICE
          uri: lb://USER-SERVICE
          predicates:
              - Path=/user/**

在我的主课上

@SpringBootApplication
@EnableEurekaClient
public class GatewayApplication {

    public static void main(String[] args) {
        SpringApplication.run(GatewayApplication.class, args);
    }

}

​

​

我可以直接从它们各自的端口访问服务，但是当我尝试从端口网关端口(例如9191 )访问api时，我得到了

**2022-09-08 16:23:34.644错误4128 - ctor-http-nio-3 a.w.r.e.AbstractErrorWebExceptionHandler :7e6c1cec-3500server Error "/user/getUserDepartment/1“java.net.UnknownHostException:在reactor.core.publisher.FluxOnAssembly$OnAssemblyException的5次查询后未能解析'xxxxxxxx‘：在以下站点观察到错误: org.springframework.boot.actuate.metrics.web.reactive.server.MetricsWebFilter⇢DefaultWebFilterChain __checkpoint⇢__checkpoint DefaultWebFilterChain __checkpoint⇢HTTP "/user/getUserDepartment/1“ExceptionHandlingWebHandler原始堆栈跟踪: at io.netty.resolver.dns.DnsResolveContext.finishResolve(DnsResolveContext.java:1047) ~netty-resolver-dns-4.1.79.Final.jar:4.1.79.Final at io.netty.resolver.dns.DnsResolveContext.tryToFinishResolve(DnsResolveContext.java:1000) ~netty-resolver-dns-4.1.79.Final.jar:4.1.79.Final at io.netty.resolver.dns.DnsResolveContext.query(DnsResolveContext.java:418) ~netty-resolver-dns-4.1.79.Final.jar:4.1.79.Final at io.netty.resolver.dns.DnsResolveContext.access$600(DnsResolveContext.java:66) ~netty-resolver-dns-4.1.79.Final.jar:4.1.79.Finalio.netty.resolver.dns.DnsResolveContext$2.operationComplete(DnsResolveContext.java:467) ~netty-resolver-dns-4.1.79.Final.jar:4.1.79.Final at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:578) ~netty-io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:578)-4.1.79.Final.jar:4.1.79.Final.jar:4.1.79io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:550) ~nettyio.netty.util.concurrent.DefaultPromise.setFailure0(DefaultPromise.java:609) ~nettyio.netty.resolver.dns.DnsQueryContext$4.run(DnsQueryContext.java:208) ~netty-resolver-dns-4.1.79.Final.jar:4.1.79.Final at io.netty.util.concurrent.PromiseTask.runTask(PromiseTask.java:98) ~netty-Common-4.1.79.Final.jar:4.1.79.Final.jar:4.1.79.Final.jar:4.1.79.Final.jar:4io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:174) ~nettyio.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:503) ~netty-transport-4.1.79.Final.jar:4.1.79.Final at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) ~netty-Common-4.1.79.Final.jar:4.1.79.Final.jar:4.1.79.Final.jar:4.1.79.Final.jar:4io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~netty处的.1.79.Final --常见-4.1.79.Final.jar:4.1.79. timed at java.base/java.lang.Thread.run(Thread.java:834) ~na:na，由: io.netty.resolver.dns.DnsNameResolverTimeoutException: /xxxxxxx查询引起的，经过5000毫秒后超时(没有堆栈跟踪)

* Application.yml文件的DepartmentService

server:
  port: 9001
spring:
  application:
    name: DEPARTMENT-SERVICE
  eureka:
    client:
      register-witheureka: true
      fetch-registry: true
      service-url:
        defaultZone: http://localhost:8761/eureka/
    instance:
      hostname: localhost
      prefer-ip-address: true

Answer 1

我通过在所有使用网关服务的微服务的eureka.instance.prefer-ip-address=true和eureka.instance.prefer-ip-address=true中添加application.properties来解决这个问题。