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负载平衡器没有可用于客户端会议的服务器

netflix-eureka netflix-zuul microservices spring-boot java

bibliophilsagar · 技术社区 · 8 年前

当我试着去服务的时候 meeting 通过zuul网关,zuul无法将请求转发到各自的服务。以下是我面临的错误:

nettflix.zuul.exception.zuul exception:转发错误

原因:com.netflix.client.clientException:负载平衡器没有可用于客户端会议的服务器

让我共享服务的application.yml、eureka和zuul gateway。

EurekaClient: Application.yml

server:
  port: 8761

eureka:
  instance:
    hostname: localhost
    lease-renewal-interval-in-seconds: 300
  client:
    register-with-eureka: false
    fetch-registry: true
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

ZuulGateWay: application.yml

server:
  port: 8085

spring:
  application:
    name: gatekeeper


zuul:
  routes:
    meeting: /meeting/**
    serviceId: meeting

ribbon:
  eureka:
    enabled: false

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

ZuulGateWay: SpringBootApplication

package com.sagarp.gatekeeper;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;

@SpringBootApplication
@EnableEurekaClient
@EnableZuulProxy
public class MeetingApplication {

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

我的服务类(会议): 应用程序

server:
  port: 0
spring:
  application:
    name: meeting
  datasource:
    url: jdbc:mysql://localhost:3306/sagarp?useSSL=false
    username: myUserName
    password: myPassWord
  jpa:
    properties:
      hibernate:
        dialect: org.hibernate.dialect.MySQL5InnoDBDialect
    hibernate:
     ddl-auto: update

eureka:
  client:
    registerWithEureka: true
    fetchRegistry: true
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
  instance:
    lease-renewal-interval-in-seconds: 5

我的服务类(会议): Springboot应用程序

package com.sagarp;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication
@EnableEurekaClient
public class MeetingApplication {

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

如您所见,配置确保我的所有服务都由Eureka客户机发现。

在Eureka控制台中,我已经验证了相同的 zuul gateway 和 my service(meeting) 两者都是可见的。

要获得更好的视图,您可以访问我的Git回购。 https://github.com/sagar-patro/demo-microservices

任何帮助都是非常可观的

1 回复 | 直到 8 年前

Andrew 8 年前

简短的回答

功能区: 尤里卡: 启用:假 < /代码>

Spring Cloud Netflix zuuluse sNetflix_S Ribbonto performclient-side load balancing,and by default,Ribbonwould useNetflix eurekaforservice discovery。您将跳过“服务发现”,因此您已经设置了“功能区”。eureka.enabledtofalse。由于功能区=>strong>现在可以使用eureka=>strong>查找服务,您必须为会议指定一个URL=>code>服务:

会议: 丝带: 服务器列表:本地主机:8080 < /代码> 扩展的答案我会让你更清楚一点。依赖项org.springframework.cloud:spring cloud starter netflix zuul>,which you are currently using in thegatekeeperproject,has some compile dependencies:。 com.netflix.zuul:zuul-core org.springframework.boot:spring boot starter web org.springframework.boot:弹簧启动执行器 org.springframework.cloud:spring cloud netflix zuul org.springframework.cloud:spring cloud starter org.springframework.cloud:pring cloud starter netflix hystrix org.springframework.cloud:spring cloud starter netflix功能区 org.springframework.cloud:SpringCloudStarterNetflixArchaius < /代码> 如您所见,它构成了围绕com.netflix.zuul:zuul core>a>module(including eureka for instance discovery and bribbon for routing):收集的许多组件。当您启动gategeeperapplication时,将应用默认的zuulproxyautoconfigurationconfiguration。它导入功能区配置类: 配置 @导入(RibbonCommandFactoryConfiguration.RestClientRibbonConfiguration.Class, ribbonCommandFactoryConfiguration.okhttpribbonConfiguration.class, RibbonCommandFactoryConfiguration.httpClientRibbonConfiguration.class, httpclientconfiguration.class) @Conditionalonbean(zuulproxymarkerconfiguration.marker.class) 公共类zuulproxyautoconfiguration扩展zuulserverautoconfiguration…} < /代码> httpClientRibbonConfiguration,依次初始化RibbonLoadBalancinghttpClientwhich is responsible for the error messages you saw. ribbonloadbalancinghttpclientby default useszoneawareloadbalancerwhich comes from acom.netflix.bribbon:ribbon loadbalancerpackage:。 < Buff行情> 默认情况下,zuul负载平衡使用zoneawareloadbalancerFrom Ribbon.算法是Discovery中可用实例的循环,具有可用性Zone Success Tracking for Resilibility。负载均衡器将保留每个区域的统计信息,如果故障率高于可配置的阈值,则会删除一个区域。如果您想使用自己的自定义负载均衡器,可以为该功能区客户端命名空间设置nfloadbalancerclassnameproperty,或者覆盖getloadbalancerclass()中的DefaultClientChannelManager。注意,您的类应该扩展dynamicServerlistLoadBalancer。 < /块引用> 它解释了zuul将路由和负载平衡工作委托给功能区组件,并证明您实际上在gategeeperproject中使用了功能区。除非您选择不同的负载均衡器,否则您应该选择我的原始答案。我希望它能有所帮助。 S带表演客户端负载平衡,默认情况下,色带将使用纳菲利克斯尤里卡对于服务发现. 你正在跳过服务发现所以你已经设定了ribbon.eureka.enabled到false. 自从色带现在可以用了尤里卡若要查找服务,必须为meeting服务: meeting: ribbon: listOfServers: localhost:8080 扩展答案我会更清楚地告诉你。依赖性org.springframework.cloud:spring-cloud-starter-netflix-zuul,您当前在gatekeeper项目有几个编译依赖项: com.netflix.zuul:zuul-core org.springframework.boot:spring-boot-starter-web org.springframework.boot:spring-boot-starter-actuator org.springframework.cloud:spring-cloud-netflix-zuul org.springframework.cloud:spring-cloud-starter org.springframework.cloud:pring-cloud-starter-netflix-hystrix org.springframework.cloud:spring-cloud-starter-netflix-ribbon org.springframework.cloud:spring-cloud-starter-netflix-archaius 如您所见,它构成了聚集在com.netflix.zuul:zuul-core模块(包括用于路由的Eureka,例如Discovery和Ribbon): 当你启动看门人应用程序,默认ZuulProxyAutoConfiguration正在应用配置。它导入功能区配置类: @Configuration @Import({ RibbonCommandFactoryConfiguration.RestClientRibbonConfiguration.class, RibbonCommandFactoryConfiguration.OkHttpRibbonConfiguration.class, RibbonCommandFactoryConfiguration.HttpClientRibbonConfiguration.class, HttpClientConfiguration.class }) @ConditionalOnBean(ZuulProxyMarkerConfiguration.Marker.class) public class ZuulProxyAutoConfiguration extends ZuulServerAutoConfiguration { ... } HttpClientRibbonConfiguration依次初始化RibbonLoadBalancingHttpClient它负责您看到的错误消息。那RibbonLoadBalancingHTTPClient(RibbonLoadBalancingHTTPClient)默认使用ZoneAwareLoadBalancer它来自com.netflix.ribbon:ribbon-loadbalancer包裹: 默认情况下,zuul负载平衡使用带式平衡机从缎带。该算法是发现中可用实例的循环,并对可用性区域的恢复性进行成功跟踪。负载均衡器将保留每个区域的统计信息,如果故障率高于可配置的阈值,则会删除一个区域。如果要使用自己的自定义负载平衡器,可以设置NFLoadBalancerClassName属性,或重写getLoadBalancerClass()方法在DefaultClientChannelManager. 注意你的课程应该扩展DynamicServerListLoadBalancer. 它解释了zuul将路由和负载平衡工作委托给功能区组件,并证明您实际上在看门人项目。除非您选择不同的负载均衡器,否则您应该使用我的原始答案。希望能有所帮助。