Eureka集群的节点之间无法互相注册的问题

今天根据网上配置Eureka高可用注册中心的教程来试着配置eureka集群。

我的Eureka配置文件如下：

---
spring:
  profiles: peer1
  application:
    name: eureka-server
server:
  port: 8761

eureka:
  instance:
    hostname: localhost
  client:
    fetch-registry: true
    register-with-eureka: false
    serviceUrl:
      defaultZone: http://localhost:8762/eureka/
---
spring:
  profiles: peer2
  application:
    name: eureka-server
server:
  port: 8762

eureka:
  instance:
    hostname: localhost
  client:
    fetch-registry: true
    register-with-eureka: false
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

运行时启动两个实例，profiles分别为peer1和peer2。
启动后访问localhost:8761，eureka界面如下:

1.png

访问localhost:8762，界面如下：

2.png

可见peer1和peer2之间并没有互相注册，因为peer1和peer2中unavailable-replicas和
available-replicas为空，且我在peer1中注册的zuul实例，并没有共享给peer2.

后来发现原因是因为如果hostname写的localhost或者127.0.0.1的话，就会出现这种问题，当时嫌麻烦就用的localhost代替，坑啊。

这是win10改host的教程，将peer1和peer2都指向localhost之后，修改Eureka配置如下：

---
spring:
  profiles: peer1
  application:
    name: eureka-server
server:
  port: 8761

eureka:
  instance:
    hostname: peer1
  client:
    fetch-registry: true
    register-with-eureka: false
    serviceUrl:
      defaultZone: http://peer2:8762/eureka/
---
spring:
  profiles: peer2
  application:
    name: eureka-server
server:
  port: 8762

eureka:
  instance:
    hostname: peer2
  client:
    fetch-registry: true
    register-with-eureka: false
    serviceUrl:
      defaultZone: http://peer1:8761/eureka/

再次启动，访问peer2:8762，看到了peer1:8761的信息和zuul实例的信息，问题解决