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
