本機測試搭建Eureka Server的高可用環境，啓動後報錯如下：
com.sun.jersey.api.client.ClientHandlerException: java.net.ConnectException: 拒絕連接 (Connection refused)
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]
at com.netflix.discovery.EurekaIdentityHeaderFilter.handle(EurekaIdentityHeaderFilter.java:27) ~[eureka-client-1.7.0.jar!/:1.7.0]
at com.sun.jersey.api.client.Client.handle(Client.java:652) ~[jersey-client-1.19.1.jar!/:1.19.1]
at com.sun.jersey.api.client.WebResource.handle(WebResource.java:682) ~[jersey-client-1.19.1.jar!/:1.19.1]
at com.sun.jersey.api.client.WebResource.access$200(WebResource.java:74) ~[jersey-client-1.19.1.jar!/:1.19.1]
at com.sun.jersey.api.client.WebResource$Builder.get(WebResource.java:509) ~[jersey-client-1.19.1.jar!/:1.19.1]
at
......
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-1.7.0.jar!/:1.7.0]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) ~[eureka-client-1.7.0.jar!/:1.7.0]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$1.execute(EurekaHttpClientDecorator.java:59) ~[eureka-client-1.7.0.jar!/:1.7.0]
at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) ~[eureka-client-1.7.0.jar!/:1.7.0]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) ~[eureka-client-1.7.0.jar!/:1.7.0]
at com.netflix.discovery.DiscoveryClient.register(DiscoveryClient.java:807) ~[eureka-client-1.7.0.jar!/:1.7.0]
at com.netflix.discovery.InstanceInfoReplicator.run(InstanceInfoReplicator.java:104) ~[eureka-client-1.7.0.jar!/:1.7.0]
at com.netflix.discovery.InstanceInfoReplicator$1.run(InstanceInfoReplicator.java:88) [eureka-client-1.7.0.jar!/:1.7.0]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_192]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_192]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_192]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [na:1.8.0_192]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_192]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_192]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_192]application.yml的內容：
spring:
application:
name: microservice-discovery-eureka-ha
---
spring:
profiles: peer1 # 指定profile=peer1
server:
port: 8761
eureka:
instance:
hostname: peer1 # 指定當profile=peer1時，主機名是peer1
client:
serviceUrl:
defaultZone: http://peer2:8762/eureka/ # 將自己註冊到peer2這個Eureka上面去
---
spring:
profiles: peer2
server:
port: 8762
eureka:
instance:
hostname: peer2
client:
serviceUrl:
defaultZone: http://peer1:8761/eureka/
最後找到解決辦法，把裏面的 spring.application.name改爲駝峯格式：
spring:
application:
name: microserviceDiscoveryEurekaHa # 解決 TransportException最後重新啓動，集羣OK，沒問題：
2018-12-02 21:22:25.380 INFO 8546 --- [freshExecutor-0] com.netflix.discovery.DiscoveryClient : Getting all instance registry info from the eureka server
2018-12-02 21:22:25.399 INFO 8546 --- [tbeatExecutor-0] com.netflix.discovery.DiscoveryClient : DiscoveryClient_MICROSERVICEDISCOVERYEUREKAHA/192.168.2.110:microserviceDiscoveryEurekaHa:8761 - Re-registering apps/MICROSERVICEDISCOVERYEUREKAHA
2018-12-02 21:22:25.399 INFO 8546 --- [tbeatExecutor-0] com.netflix.discovery.DiscoveryClient : DiscoveryClient_MICROSERVICEDISCOVERYEUREKAHA/192.168.2.110:microserviceDiscoveryEurekaHa:8761: registering service...
2018-12-02 21:22:25.403 INFO 8546 --- [freshExecutor-0] com.netflix.discovery.DiscoveryClient : The response status is 200
爲什麼改爲駝峯就能解決問題，背後的原理暫時還不知道，加個TODO，等後面看到這部分，回過頭來補充。