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。
废话不多说,直接上拓扑图:
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: peer1 application: name: eureka-ha eureka: instance: hostname: peer1 client: serviceUrl: defaultZone: http://peer2:8772/eureka/,http://peer3:8773/eureka/ --- server: port: 8772 spring: profiles: peer2 application: name: eureka-ha eureka: instance: hostname: peer2 client: serviceUrl: defaultZone: http://peer1:8771/eureka/,http://peer3:8773/eureka/ --- server: port: 8773 spring: profiles: peer3 application: name: eureka-ha eureka: instance: hostname: peer3 client: 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:
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 error com.sun.jersey.api.client.ClientHandlerException: java.net.ConnectException: Connection refused: connect at 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: connect at 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 omitted 2018-05-26 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 server com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server at 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 error com.sun.jersey.api.client.ClientHandlerException: java.net.ConnectException: Connection refused: connect at 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: connect at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method) ~[na:1.8.0_131] ... ... 30 common frames omitted 2018-05-26 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 server com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server at 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 replicator com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server at 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]
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: