DiscoveryClient 没有看到来自 Eureka 的服务

Question

当我询问 eureka 它知道的服务时 (localhost:8071/eureka/apps/)，它说 3 是 UP:

<applications>
  <versions__delta>1</versions__delta>
  <apps__hashcode>UP_3_</apps__hashcode>
  <application>
    <name>ROUTER</name>
    <instance>
      <instanceId>localhost:router:8765</instanceId>
      <hostName>localhost</hostName>
      <app>ROUTER</app>
      <ipAddr>10.0.75.1</ipAddr>
      <status>UP</status>
      <overriddenstatus>UNKNOWN</overriddenstatus>
      <port enabled="true">8765</port>
      <securePort enabled="false">443</securePort>
      <countryId>1</countryId>
      <dataCenterInfo class="com.netflix.appinfo.InstanceInfo$DefaultDataCenterInfo">
        <name>MyOwn</name>
      </dataCenterInfo>
      <leaseInfo>
        <renewalIntervalInSecs>30</renewalIntervalInSecs>
        <durationInSecs>90</durationInSecs>
        <registrationTimestamp>1502197927458</registrationTimestamp>
        <lastRenewalTimestamp>1502198527594</lastRenewalTimestamp>
        <evictionTimestamp>0</evictionTimestamp>
        <serviceUpTimestamp>1502197927458</serviceUpTimestamp>
      </leaseInfo>
      <metadata class="java.util.Collections$EmptyMap"/>
      <homePageUrl>http://localhost:8765/</homePageUrl>
      <statusPageUrl>http://localhost:8765/info</statusPageUrl>
      <healthCheckUrl>http://localhost:8765/health</healthCheckUrl>
      <vipAddress>router</vipAddress>
      <secureVipAddress>router</secureVipAddress>
      <isCoordinatingDiscoveryServer>false</isCoordinatingDiscoveryServer>
      <lastUpdatedTimestamp>1502197927458</lastUpdatedTimestamp>
      <lastDirtyTimestamp>1502197825173</lastDirtyTimestamp>
      <actionType>ADDED</actionType>
    </instance>
  </application>
  <application>
    <name>ORDERS</name>
    <instance>
      <instanceId>localhost:ORDERS:8081</instanceId>
      <hostName>localhost</hostName>
      <app>ORDERS</app>
      <ipAddr>10.0.75.1</ipAddr>
      <status>UP</status>
      <overriddenstatus>UNKNOWN</overriddenstatus>
      <port enabled="true">8081</port>
      <securePort enabled="false">443</securePort>
      <countryId>1</countryId>
      <dataCenterInfo class="com.netflix.appinfo.InstanceInfo$DefaultDataCenterInfo">
        <name>MyOwn</name>
      </dataCenterInfo>
      <leaseInfo>
        <renewalIntervalInSecs>30</renewalIntervalInSecs>
        <durationInSecs>90</durationInSecs>
        <registrationTimestamp>1502198168983</registrationTimestamp>
        <lastRenewalTimestamp>1502198528945</lastRenewalTimestamp>
        <evictionTimestamp>0</evictionTimestamp>
        <serviceUpTimestamp>1502198088982</serviceUpTimestamp>
      </leaseInfo>
      <metadata class="java.util.Collections$EmptyMap"/>
      <homePageUrl>http://localhost:8081/</homePageUrl>
      <statusPageUrl>http://localhost:8081/info</statusPageUrl>
      <healthCheckUrl>http://localhost:8081/health</healthCheckUrl>
      <vipAddress>ORDERS</vipAddress>
      <secureVipAddress>ORDERS</secureVipAddress>
      <isCoordinatingDiscoveryServer>false</isCoordinatingDiscoveryServer>
      <lastUpdatedTimestamp>1502198168983</lastUpdatedTimestamp>
      <lastDirtyTimestamp>1502198168956</lastDirtyTimestamp>
      <actionType>ADDED</actionType>
    </instance>
  </application>
  <application>
    <name>FRONTEND</name>
    <instance>
      <instanceId>32e1ed7e75ba:8080</instanceId>
      <hostName>32e1ed7e75ba</hostName>
      <app>FRONTEND</app>
      <ipAddr>172.17.0.3</ipAddr>
      <status>UP</status>
      <overriddenstatus>UNKNOWN</overriddenstatus>
      <port enabled="true">8080</port>
      <securePort enabled="false">7002</securePort>
      <countryId>1</countryId>
      <dataCenterInfo class="com.netflix.appinfo.InstanceInfo$DefaultDataCenterInfo">
        <name>MyOwn</name>
      </dataCenterInfo>
      <leaseInfo>
        <renewalIntervalInSecs>30</renewalIntervalInSecs>
        <durationInSecs>90</durationInSecs>
        <registrationTimestamp>1502197928887</registrationTimestamp>
        <lastRenewalTimestamp>1502198529372</lastRenewalTimestamp>
        <evictionTimestamp>0</evictionTimestamp>
        <serviceUpTimestamp>1502197928887</serviceUpTimestamp>
      </leaseInfo>
      <metadata class="java.util.Collections$EmptyMap"/>
      <homePageUrl>http://32e1ed7e75ba:8080</homePageUrl>
      <statusPageUrl>http://32e1ed7e75ba:8080/info</statusPageUrl>
      <healthCheckUrl>http://32e1ed7e75ba:8080/health</healthCheckUrl>
      <vipAddress>true</vipAddress>
      <isCoordinatingDiscoveryServer>false</isCoordinatingDiscoveryServer>
      <lastUpdatedTimestamp>1502197928887</lastUpdatedTimestamp>
      <lastDirtyTimestamp>1502197928886</lastDirtyTimestamp>
      <actionType>ADDED</actionType>
    </instance>
  </application>
</applications>

但后来我问我的 ROUTER，它知道哪些（使用 https://spring.io/guides/gs/service-registration-and-discovery/ 中的 ServiceInstanceRestController）它说 2 - ROUTER 和 ORDER，但没有 FRONTEND。

有谁知道可能是什么原因吗？

作为提示，WEBFRONT 应用程序是带有 eureka 插件的 nodejs 应用程序。 ROUTER 和 ORDERS 都是 Boots。显然 FRONTEND 正确注册并且 eureka 将其视为 UP。我逐行比较了 ORDERS 和 FRONTEND 的 eureka XML 输出，并没有发现任何关键差异...

Answer 1

我发现的一件事是前端服务的 vipAddress 字段，它是 true，但我认为在您的情况下它应该是 FRONTEND 或 frontend。因为在后台 EurekaDiscoveryClient 使用 com.netflix.discovery.EurekaClient getInstancesByVipAddress(String,bool) 函数 (source in the spring-cloud-netflix-eureka-client project)，它通过 vipAddress.

查询可用服务

更改后，您应该会在路由器服务 /service-instances/frontend 路径的响应中看到该服务。

DiscoveryClient 没有看到来自 Eureka 的服务

DiscoveryClient does not see a service from Eureka

spring-cloud

netflix-eureka

spring-cloud-netflix