Eureka整合Spring Cloud Config Native 模式，实现在线扩容

前言：

spring cloud eureka的高可用之在线扩容，只要结合上一节Config Bus热刷新，便轻松实现。先奉上源码

实现步骤：

1. 一个eureka server 和一个eureka client

1. 启动good-config-server模块，更改配置文件

eureka-client.yml的配置设置如下

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/ # one eureka server

eureka-server-peer1.yml配置如下

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/ # one eureka server

2. 执行curl -X POST http://localhost:8888/actuator/bus-refresh使上面更改生效
3. 启动good-eureka-server，profile=peer1
4. 启动good-eureka-client
5. 验证：

good-spring-cloud git:(master) ✗ curl -i http://127.0.0.1:8761/query/eureka-server      
{"defaultZone":"http://localhost:8761/eureka/"}
good-spring-cloud git:(master) ✗ curl -i http://127.0.0.1:8081/query/eureka-server
{"defaultZone":"http://localhost:8761/eureka/"}

2. 添加第二个eureka server

1. 更改配置文件

eureka-client.yml的配置设置如下

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/,http://localhost:8762/eureka/ # two eureka server

eureka-server-peer1.yml配置如下

server:
  port: 8761
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8762/eureka/ # two eureka server

eureka-server-peer2.yml配置如下

server:
  port: 8762
eureka:
  client:
    serviceUrl:
	      defaultZone: http://localhost:8761/eureka/ # two eureka server

2. 执行curl -X POST http://localhost:8888/actuator/bus-refresh使上面更改生效
3. 启动good-eureka-server，profile=peer2，这里面peer1不用动
4. 验证：

➜  good-spring-cloud git:(master) ✗ curl -i http://127.0.0.1:8081/query/eureka-server       
{"defaultZone":"http://localhost:8761/eureka/,http://localhost:8762/eureka/"}%
➜  good-spring-cloud git:(master) ✗ curl -i http://127.0.0.1:8761/query/eureka-server
{"defaultZone":"http://localhost:8762/eureka/"}%
➜  good-spring-cloud git:(master) ✗ curl -i http://127.0.0.1:8762/query/eureka-server
{"defaultZone":"http://localhost:8761/eureka/"}%         

2. 添加第三个eureka server

1. 更改配置文件
   eureka-client.yml的配置设置如下

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/,http://localhost:8762/eureka/,http://localhost:8763/eureka/ # three eureka server

eureka-server-peer1.yml配置如下

server:
  port: 8761
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8762/eureka/,http://localhost:8763/eureka/ # three eureka server

eureka-server-peer2.yml配置如下

server:
  port: 8762
eureka:
  client:
    serviceUrl:
	      defaultZone: http://localhost:8761/eureka/,http://localhost:8763/eureka/ # three eureka server

eureka-server-peer3.yml配置如下

server:
  port: 8763
eureka:
  client:
    serviceUrl:
	      defaultZone: http://localhost:8761/eureka/,http://localhost:8762/eureka/ # three eureka server

2. 执行curl -X POST http://localhost:8888/actuator/bus-refresh使上面更改生效
3. 启动good-eureka-server，profile=peer3，这里面peer1，peer2不用动
4. 验证：

➜  good-spring-cloud git:(master) curl http://127.0.0.1:8081/query/eureka-server       
{"defaultZone":"http://localhost:8761/eureka/,http://localhost:8762/eureka/,http://localhost:8763/eureka/"}%
➜  good-spring-cloud git:(master) curl http://127.0.0.1:8761/query/eureka-server       
{"defaultZone":"http://localhost:8762/eureka/,http://localhost:8763/eureka/"}%
➜  good-spring-cloud git:(master) curl -i http://127.0.0.1:8762/query/eureka-server       
{"defaultZone":"http://localhost:8761/eureka/,http://localhost:8763/eureka/"}%
➜  good-spring-cloud git:(master) curl -i http://127.0.0.1:8763/query/eureka-server
{"defaultZone":"http://localhost:8761/eureka/,http://localhost:8762/eureka/"}%

结束语

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参考书籍：重新定义springcloud实战