Spring Cloud | 实现Eureka Server 高可用服务注册中心全套解决方案

1、在搭建Eureka Server，配置高可用服务注册中心，配置3个Eureka Server:

下面出现登录问题，需要参照给Eureka Server加上安全验证这篇文章：Spring Cloud (18) | 给Eureka Server加上安全验证

application.yml:

#安全验证
security:
  basic:
    enabled: true
  user:
    name: jack.ma
    password: 1qaz2wsx
spring:
  application:
    name: eureka-server-cluster
  profiles:
    active: server1
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application-server1.yml:

server:
  port: 8761

eureka:
  instance:
    hostname: server1
#    prefer-ip-address: true
    instance-id: ${spring.application.name}:${server.port}
  client:
    register-with-eureka: false
    fetch-registry: false
    serviceUrl:
      defaultZone: http://server2:8200/eureka/,http://server3:8300/eureka/
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application-server2.yml:

server:
  port: 8200
#
#spring:
#  profiles:
#    active: server1

eureka:
  instance:
    hostname: server2
#    prefer-ip-address: true
    instance-id: ${spring.application.name}:${server.port}
  client:
    register-with-eureka: false
    fetch-registry: false
    serviceUrl:
      defaultZone: http://server1:8761/eureka/,http://server3:8300/eureka/
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application-server3.yml:

server:
  port: 8300
#
#spring:
#  profiles:
#    active: server1

eureka:
  instance:
    hostname: server3
#    prefer-ip-address: true
    instance-id: ${spring.application.name}:${server.port}
  client:
    register-with-eureka: false
    fetch-registry: false
    serviceUrl:
      defaultZone: http://server1:8761/eureka/,http://server2:8200/eureka/
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2、因为是在本地实现的话，需要在localhost加入三个服务，需要改变etc/hosts，linux系统通过vim /etc/hosts，

windows电脑，在c:/windows/systems/drivers/etc/hosts 修改
加入：

127.0.0.1       server1
127.0.0.1       server2
127.0.0.1       server3
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3、如果是在测试或者是线上环境，准备三台应用服务器就可以了

启动工程：
在elipse中启动eureka-server：

java -jar eureka-server-0.0.1-SNAPSHOT.jar - -spring.profiles.active=server1

java -jar eureka-server-0.0.1-SNAPSHOT.jar - -spring.profiles.active=server2


java -jar eureka-server-0.0.1-SNAPSHOT.jar - -spring.profiles.active=server3
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4、如果在idea中，可以用简单方法：

在 Edit Configurations中新建3个Spring Boot服务，选择“+“ 新建 “Spring Boot”, 分别是：eurekaServer-1,eurekaServer-2,eurekaServer-3
如图：
server1:

server2:

server3参照上图。
然后分别启动server1, server2, server3

5、需要特别注意的是：所有注册到Eureka Server的服务，defaultZone要做相应的修改如下：

eureka:
  client:
    serviceUrl:
      defaultZone: http://jack.ma:1qaz2wsx@server1:8761/eureka/,http://jack.ma:1qaz2wsx@server2:8200/eureka/,http://jack.ma:1qaz2wsx@server3:8300/eureka/
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defaultZone中多个服务之间，用","连接
三个Eureka Server中，按照这个顺序来显示微服务，shutdown其中的任何一个Eureka Server, 会顺次转发到另外一个Eureka Server上

完整项目，“墙裂“推荐看：https://github.com/dangduang/Spring-Cloud-By-Dang/tree/master/spring-cloud-eureka-server

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