Spring Cloud (19) | Eureka Server 高可用服务注册中心

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

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/[/code] 
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/[/code] 
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/[/code] 
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


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


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

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/[/code] 
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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