Spring Cloud Config Eureka-first 方法不起作用

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【中文标题】Spring Cloud Config Eureka-first 方法不起作用【英文标题】：Spring Cloud Config Eureka-first approach not working 【发布时间】：2016-05-12 09:19:55 【问题描述】：

我正在开发一个 Spring Cloud Eureka 微服务应用程序。我希望我的服务通过 Eureka-first 方法连接到配置服务。微服务被打包为 docker 容器并通过 docker-compose 部署。该应用程序由以下人员组成：

    myapp-service-registry：使用Spring Cloud Eureka实现的服务注册服务 myapp-config-service：Spring Cloud 配置服务服务器 myapp-service-test：一个示例微服务，它应该尝试通过 Eureka-first 方法连接到配置服务来获取其配置数据。

与配置服务的连接失败，如下所述。首先是一些配置数据：

这里是myapp-service-registry的application.yml：

server:
  port: $PORT:8761

eureka:
  client:
    registerWithEureka: false
    fetchRegistry: false
  server:
    waitTimeInMsWhenSyncEmpty: 0

这里是myapp-config-service 的application.yml：

server:
  port: $MYAPP_CONFIG_SERVICE_PORT:8888

spring: 
  cloud:
    config:
      server:
        git:
          uri: $MYAPP_CONFIG_SERVICE_GIT_URI
  config:
    name: myapp-config-service

# eureka service registry client

eureka: 
    client:
        serviceUrl:
            defaultZone: http://$SERVICE_REGISTRY_HOST:$SERVICE_REGISTRY_PORT/eureka/
    instance:
        preferIpAddress: true

配置服务器和客户端在configserver-eureka 和eureka-first 示例中初始化为https://github.com/spring-cloud-samples/tests：

myapp-config-service 的bootstrap.yml 是：

spring:
    application:
        name: myapp-config-service
    cloud:
        config:
            discovery:
                enabled: true

还有myapp-service-test的application.yml：

eureka:
    client:
        serviceUrl:
            defaultZone: http://$SERVICE_REGISTRY_HOST:$SERVICE_REGISTRY_PORT/eureka/
    instance:
        preferIpAddress: true

还有myapp-service-test的bootstrap.yml：

spring:
  application:
    name: myapp-service-test
  cloud:
    config:
      discovery:
        enabled: true
        serviceId: myapp-config-service

下面是docker-compose.yml（环境变量在启动时被实际值替换）：

myapp-service-registry:
image: myapp/myapp-service-registry:0.0.1
ports:
    - $EUREKA_PORT:$EUREKA_PORT

# myapp-config-service

myapp-config-service:
    image: myapp/myapp-config-service:0.0.1
    volumes:
    - $MYAPP_DATA_FOLDER/config:/var/opt/myapp/config
    environment:
      MYAPP_CONFIG_SERVICE_PORT: $MYAPP_CONFIG_SERVICE_PORT
      SERVICE_REGISTRY_HOST: $MYAPP_STAGING_IP
      SERVICE_REGISTRY_PORT: $EUREKA_PORT
      MYAPP_CONFIG_SERVICE_GIT_URI: $MYAPP_CONFIG_SERVICE_GIT_URI
    ports:
        - $MYAPP_CONFIG_SERVICE_PORT:$MYAPP_CONFIG_SERVICE_PORT

 # myapp-service-test

myapp-service-test:
  image: myapp/myapp-service-test:0.0.1
  environment:
    SERVICE_REGISTRY_HOST: $MYAPP_STAGING_IP
    SERVICE_REGISTRY_PORT: $EUREKA_PORT
  ports:
    - $MYAPP_SERVICE_TEST_TWO_PORT:8080

我可以通过将浏览器连接到 http://[...MACHINE-IP...]:8761/ 并查看 Eureka 仪表板来检查 Eureka 是否正常工作。同样，我测试配置服务是否正常工作并响应http:///[...MACHINE-IP...]:8888/myapp-config-service；另一方面，使用上述配置，myapp-service-test 在启动时会崩溃并显示以下日志：

-02-03 08:26:45.191  INFO 1 --- [           main] e.f.s.two.TestServiceApplication      : Starting TestServiceApplication v0.0.1 on b1bc37422027 with PID 1 (/app.jar started by root in /)
2016-02-03 08:26:45.223  INFO 1 --- [           main] e.f.s.two.TestServiceApplication      : No active profile set, falling back to default profiles: default
2016-02-03 08:26:45.448  INFO 1 --- [           main] s.c.a.AnnotationConfigApplicationContext : Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@4d97e82d: startup date [Wed Feb 03 08:26:45 UTC 2016]; root of context hierarchy
2016-02-03 08:26:46.382  INFO 1 --- [           main] f.a.AutowiredAnnotationBeanPostProcessor : JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
2016-02-03 08:26:46.442  INFO 1 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'configurationPropertiesRebinderAutoConfiguration' of type [class org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$6b65138e] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2016-02-03 08:26:47.089  INFO 1 --- [           main] o.s.c.n.eureka.InstanceInfoFactory       : Setting initial instance status as: STARTING
2016-02-03 08:26:48.231  INFO 1 --- [           main] c.n.d.provider.DiscoveryJerseyProvider   : Using encoding codec LegacyJacksonJson
2016-02-03 08:26:48.237  INFO 1 --- [           main] c.n.d.provider.DiscoveryJerseyProvider   : Using decoding codec LegacyJacksonJson
2016-02-03 08:26:49.171  INFO 1 --- [           main] c.n.d.provider.DiscoveryJerseyProvider   : Using encoding codec LegacyJacksonJson
2016-02-03 08:26:49.171  INFO 1 --- [           main] c.n.d.provider.DiscoveryJerseyProvider   : Using decoding codec LegacyJacksonJson
2016-02-03 08:26:49.496  INFO 1 --- [           main] com.netflix.discovery.DiscoveryClient    : Disable delta property : false
2016-02-03 08:26:49.497  INFO 1 --- [           main] com.netflix.discovery.DiscoveryClient    : Single vip registry refresh property : null
2016-02-03 08:26:49.497  INFO 1 --- [           main] com.netflix.discovery.DiscoveryClient    : Force full registry fetch : false
2016-02-03 08:26:49.498  INFO 1 --- [           main] com.netflix.discovery.DiscoveryClient    : Application is null : false
2016-02-03 08:26:49.502  INFO 1 --- [           main] com.netflix.discovery.DiscoveryClient    : Registered Applications size is zero : true
2016-02-03 08:26:49.503  INFO 1 --- [           main] com.netflix.discovery.DiscoveryClient    : Application version is -1: true
2016-02-03 08:26:49.503  INFO 1 --- [           main] com.netflix.discovery.DiscoveryClient    : Getting all instance registry info from the eureka server
2016-02-03 08:26:49.720  WARN 1 --- [           main] com.netflix.discovery.DiscoveryClient    : Can't get a response from http://localhost:8761/eureka/apps/
<...>
com.sun.jersey.api.client.ClientHandlerException: java.net.ConnectException: Connection refused
    at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:187) ~[jersey-apache-client4-1.19.jar!/:1.19]
    at com.sun.jersey.api.client.filter.GZIPContentEncodingFilter.handle(GZIPContentEncodingFilter.java:123) ~[jersey-client-1.19.jar!/:1.19]
    at com.netflix.discovery.EurekaIdentityHeaderFilter.handle(EurekaIdentityHeaderFilter.java:27) ~[eureka-client-1.3.4.jar!/:1.3.4]
    <...>
Caused by: java.net.ConnectException: Connection refused
    at java.net.PlainSocketImpl.socketConnect(Native Method) ~[na:1.8.0_66-internal]
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) ~[na:1.8.0_66-internal]
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) ~[na:1.8.0_66-internal]
    <...>

2016-02-03 08:26:49.747 ERROR 1 --- [           main] com.netflix.discovery.DiscoveryClient    : Can't contact any eureka nodes - possibly a security group issue?

com.sun.jersey.api.client.ClientHandlerException: java.net.ConnectException: Connection refused
    <...>

2016-02-03 08:26:49.770 ERROR 1 --- [           main] com.netflix.discovery.DiscoveryClient    : DiscoveryClient_MYAPP-SERVICE-TEST/b1bc37422027:myapp-service-test - was unable to refresh its cache! status = java.net.ConnectException: Connection refused

com.sun.jersey.api.client.ClientHandlerException: java.net.ConnectException: Connection refused
    <...>

2016-02-03 08:26:49.785  WARN 1 --- [           main] com.netflix.discovery.DiscoveryClient    : Using default backup registry implementation which does not do anything.
2016-02-03 08:26:49.810  INFO 1 --- [           main] com.netflix.discovery.DiscoveryClient    : Starting heartbeat executor: renew interval is: 10
2016-02-03 08:26:49.818  INFO 1 --- [           main] c.n.discovery.InstanceInfoReplicator     : InstanceInfoReplicator onDemand update allowed rate per min is 4
2016-02-03 08:26:50.443  WARN 1 --- [           main] lientConfigServiceBootstrapConfiguration : Could not locate configserver via discovery

java.lang.RuntimeException: No matches for the virtual host name :myapp-config-service
    at com.netflix.discovery.DiscoveryClient.getNextServerFromEureka(DiscoveryClient.java:782) ~[eureka-client-1.3.4.jar!/:1.3.4]
    at org.springframework.cloud.netflix.config.DiscoveryClientConfigServiceBootstrapConfiguration.refresh(DiscoveryClientConfigServiceBootstrapConfiguration.java:71) [spring-cloud-netflix-core-1.1.0.M3.jar!/:1.1.0.M3]
    <...>

2016-02-03 08:26:50.470  INFO 1 --- [           main] e.f.s.two.TestServiceApplication      : Started TestServiceApplication in 7.101 seconds (JVM running for 9.329)

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v1.3.1.RELEASE)

2016-02-03 08:26:50.773  INFO 1 --- [           main] c.c.c.ConfigServicePropertySourceLocator : Fetching config from server at: http://localhost:8888
2016-02-03 08:26:51.015  WARN 1 --- [           main] c.c.c.ConfigServicePropertySourceLocator : Could not locate PropertySource: I/O error on GET request for "http://localhost:8888/myapp-service-test/default":Connection refused; nested exception is java.net.ConnectException: Connection refused

<...>

2016-02-03 08:26:54.856 ERROR 1 --- [pool-5-thread-1] com.netflix.discovery.DiscoveryClient    : Can't contact any eureka nodes - possibly a security group issue?

com.sun.jersey.api.client.ClientHandlerException: java.net.ConnectException: Connection refused
    <...>

2016-02-03 08:26:57.272  WARN 1 --- [           main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'testTwoServiceController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: java.lang.String myapp.services.two.TestServiceController.message; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'message' in string value "$message"
2016-02-03 08:26:57.281  INFO 1 --- [           main] o.apache.catalina.core.StandardService   : Stopping service Tomcat
2016-02-03 08:26:57.299 ERROR 1 --- [           main] o.s.boot.SpringApplication               : Application startup failed

请注意，如果我没有实现 Eureka-first 方法（并直接在服务的bootstrap.yml 中设置 spring.cloud.config.uri），服务将注册到 Eureka，找到配置服务器并正常工作（我可以在 Eureka 的仪表板中看到注册的服务，并且可以检查配置属性是否被正确读取）。

【问题讨论】：

你需要 bootstrap.yml 中的 eureka serviceUrl 不是吗（以及配置服务器的服务 ID）？ 就是这样！通过将 myapp-service-test 中的 eureka 配置从 application.yml 移动到 bootstrap.yml，服务可以正确找到所有内容。想想看，还挺合乎逻辑的……我错过了，因为在测试服务的第一个版本（没有配置服务器）中，如果在 application.yml 中配置，eureka 注册就可以工作。然后我只是没有注意到必须将相同的内容移至 boostrap.yml，因为我也在那里配置了 spring.cloud.config.discovery。非常感谢， 你使用了哪个版本的 Spring 来实现这个功能？我可以让它与 Spring Boot:1.3.1.RELEASE 和 Cloud:Brixton.BUILD-SNAPSHOT 一起使用，但是否有一个有效的 RELEASE（不是 SNAPSHOT）设置？ 【参考方案1】：

您需要 bootstrap.yml 中的 eureka serviceUrl（以及 configserver 的服务 id）。

【讨论】：

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