配置高可用Eureka Server遇到的神坑:无法注册服务

今天在进行高可用的Eureka Server注册中心的配置时，遇到一个神坑。

拓扑图

废话不多说，直接上拓扑图：

Eureka Server配置

pom.xml:

<dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-eureka-server</artifactId>
</dependency>

开启注解：

@EnableEurekaServer
@SpringBootApplication
public class EurekaServerHaApplication {public static void main(String[] args) {SpringApplication.run(EurekaServerHaApplication.class, args);}
}

配置文件application.yml：

---
server:port: 8771
spring:profiles: peer1application:name: eureka-ha
eureka:instance:hostname: peer1client:serviceUrl:defaultZone: http://peer2:8772/eureka/,http://peer3:8773/eureka/---
server:port: 8772
spring:profiles: peer2application:name: eureka-ha
eureka:instance:hostname: peer2client:serviceUrl:defaultZone: http://peer1:8771/eureka/,http://peer3:8773/eureka/---
server:port: 8773
spring:profiles: peer3application:name: eureka-ha
eureka:instance:hostname: peer3client:serviceUrl:defaultZone: http://peer1:8771/eureka/,http://peer2:8772/eureka/

在IDEA中，分别通过设置不同的Program arguments参数为--spring.profiles.active=peer1、--spring.profiles.active=peer2、--spring.profiles.active=peer3启动这三个注册中心服务。

访问http://peer1:8771/，Eureka Server配置成功，如下所示：

Eureka Client配置

pom.xml:

<dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-eureka-server</artifactId>
</dependency>

开启注解：

@EnableEurekaClient
@RestController
@SpringBootApplication
public class EurekaHiHaApplication {public static void main(String[] args) {SpringApplication.run(EurekaHiHaApplication.class, args);}/** 获取端口号 */@Value("${server.port}")String port;/*** 定义一个简单接口*@param name*@return*/@GetMapping("/hi/{name}")public String home(@PathVariable String name){return "hi " + name + ",I am from port :" + port;}
}

配置文件application.yml：

server:port: 8783
spring:application:name: service-hi-ha
eureka:client:service-url:default-zone: http://peer1:8771/eureka/

启动报错：

2018-05-26 18:31:17.438  INFO 12972 --- [           main] com.netflix.discovery.DiscoveryClient    : Getting all instance registry info from the eureka server
2018-05-26 18:31:19.525 ERROR 12972 --- [           main] c.n.d.s.t.d.RedirectingEurekaHttpClient  : Request execution errorcom.sun.jersey.api.client.ClientHandlerException: java.net.ConnectException: Connection refused: connectat com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:187) ~[jersey-apache-client4-1.19.1.jar:1.19.1]at com.sun.jersey.api.client.filter.GZIPContentEncodingFilter.handle(GZIPContentEncodingFilter.java:123) ~[jersey-client-1.19.1.jar:1.19.1]...
Caused by: java.net.ConnectException: Connection refused: connectat java.net.DualStackPlainSocketImpl.waitForConnect(Native Method) ~[na:1.8.0_131]at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85) ~[na:1.8.0_131]...... 69 common frames omitted2018-05-26 18:31:19.531  WARN 12972 --- [           main] c.n.d.s.t.d.RetryableEurekaHttpClient    : Request execution failed with message: java.net.ConnectException: Connection refused: connect
2018-05-26 18:31:19.533 ERROR 12972 --- [           main] com.netflix.discovery.DiscoveryClient    : DiscoveryClient_SERVICE-HI-HA/DESKTOP-4J0FACQ:service-hi-ha:8783 - was unable to refresh its cache! status = Cannot execute request on any known servercom.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known serverat com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:111) ~[eureka-client-1.6.2.jar:1.6.2]...at pers.hanchao.springclouddemo.eurekahiha.EurekaHiHaApplication.main(EurekaHiHaApplication.java:17) [classes/:na]2018-05-26 18:31:19.543  WARN 12972 --- [           main] com.netflix.discovery.DiscoveryClient    : Using default backup registry implementation which does not do anything.
2018-05-26 18:31:19.543  INFO 12972 --- [           main] com.netflix.discovery.DiscoveryClient    : Starting heartbeat executor: renew interval is: 30
2018-05-26 18:31:19.543  INFO 12972 --- [           main] c.n.discovery.InstanceInfoReplicator     : InstanceInfoReplicator onDemand update allowed rate per min is 4
2018-05-26 18:31:19.543  INFO 12972 --- [           main] com.netflix.discovery.DiscoveryClient    : Discovery Client initialized at timestamp 1527330679543 with initial instances count: 0
2018-05-26 18:31:19.583  INFO 12972 --- [           main] o.s.c.n.e.s.EurekaServiceRegistry        : Registering application service-hi-ha with eureka with status UP
2018-05-26 18:31:19.583  INFO 12972 --- [           main] com.netflix.discovery.DiscoveryClient    : Saw local status change event StatusChangeEvent [timestamp=1527330679583, current=UP, previous=STARTING]
2018-05-26 18:31:19.583  INFO 12972 --- [nfoReplicator-0] com.netflix.discovery.DiscoveryClient    : DiscoveryClient_SERVICE-HI-HA/DESKTOP-4J0FACQ:service-hi-ha:8783: registering service...
2018-05-26 18:31:19.683  INFO 12972 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8783 (http)
2018-05-26 18:31:19.683  INFO 12972 --- [           main] .s.c.n.e.s.EurekaAutoServiceRegistration : Updating port to 8783
2018-05-26 18:31:19.693  INFO 12972 --- [           main] p.h.s.eurekahiha.EurekaHiHaApplication   : Started EurekaHiHaApplication in 6.824 seconds (JVM running for 7.581)
2018-05-26 18:31:21.624 ERROR 12972 --- [nfoReplicator-0] c.n.d.s.t.d.RedirectingEurekaHttpClient  : Request execution errorcom.sun.jersey.api.client.ClientHandlerException: java.net.ConnectException: Connection refused: connectat com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:187) ~[jersey-apache-client4-1.19.1.jar:1.19.1]...at java.lang.Thread.run(Thread.java:748) [na:1.8.0_131]
Caused by: java.net.ConnectException: Connection refused: connectat java.net.DualStackPlainSocketImpl.waitForConnect(Native Method) ~[na:1.8.0_131]...... 30 common frames omitted2018-05-26 18:31:21.634  WARN 12972 --- [nfoReplicator-0] c.n.d.s.t.d.RetryableEurekaHttpClient    : Request execution failed with message: java.net.ConnectException: Connection refused: connect
2018-05-26 18:31:21.634  WARN 12972 --- [nfoReplicator-0] com.netflix.discovery.DiscoveryClient    : DiscoveryClient_SERVICE-HI-HA/DESKTOP-4J0FACQ:service-hi-ha:8783 - registration failed Cannot execute request on any known servercom.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known serverat com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:111) ~[eureka-client-1.6.2.jar:1.6.2]at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) ~[eureka-client-1.6.2.jar:1.6.2]...at java.lang.Thread.run(Thread.java:748) [na:1.8.0_131]2018-05-26 18:31:21.634  WARN 12972 --- [nfoReplicator-0] c.n.discovery.InstanceInfoReplicator     : There was a problem with the instance info replicatorcom.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known serverat com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:111) ~[eureka-client-1.6.2.jar:1.6.2]at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) ~[eureka-client-1.6.2.jar:1.6.2]...at java.lang.Thread.run(Thread.java:748) [na:1.8.0_131]

错误解决

通过报错信息，可知，Eureka Client找不到Eureka Server的配置，但是我检查各项配置没有问题。

最终，我将横线命名修改为驼峰命名，问题解决：

修改Eureka Client的配置文件application.yml:

server:port: 8783
spring:application:name: service-hi-ha
eureka:client:serviceUrl:defaultZone: http://peer1:8771/eureka/

重新启动，进入Eureka Server后台，发现服务注册成功：

在浏览器访问http://localhost:8783/hi/david，服务正常：