二、eureka註冊中心集羣

 

一、 Eureka做爲spring cloud的服務發現與註冊中心，在整個的微服務體系中，處於核心位置。單機模式下的eureka服務，顯然不能知足高可用的實際生產環境，這就要求配置一個可以應對各類突發狀況，具備較強容災能力的eureka服務。Eureka經過「夥伴機制」實現高可用。每一臺Eureka都須要在配置中指定另外兩個Eureka的地址夥伴，Eureka啓動時會向本身的夥伴節點獲取當前已經存在的註冊表，這樣在向Eureka集羣中新加機器時就不須要擔憂註冊表的不完整。

二、 新建三個maven項目，分別爲sc-eureka-cluster-server-node1，sc-eureka-cluster-server-node2，sc-eureka-cluster-server-node3。項目結構以下：

  備註：pom.xml和EurekaServerApplication.java的內容給單機模式是如出一轍的，請參考上篇文章。

三、         主要看下bootstap.yml或者application.yml文件的改動

sc-eureka-cluster-server-node1

 

spring:

  application:

    name: sc-eureka-cluster-server-node1

   

server:

  port: 5001

 

eureka:

  instance:

    hostname: sc-eureka-cluster-server-node1

    lease-renewal-interval-in-seconds: 30

    lease-expiration-duration-in-seconds: 30

    prefer-ip-address: true

  client:

    registerWithEureka: false

    fetchRegistry: false

    serviceUrl:

      defaultZone: http://sc-eureka-cluster-server-node2:5002/eureka/,http://sc-eureka-cluster-server-node3:5003/eureka/

 

sc-eureka-cluster-server-node2

 

spring:

  application:

    name: sc-eureka-cluster-server-node2

   

server:

  port: 5002

 

eureka:

  instance:

    hostname: sc-eureka-cluster-server-node2

    lease-renewal-interval-in-seconds: 30

    lease-expiration-duration-in-seconds: 30

    prefer-ip-address: true

  client:

    registerWithEureka: false

    fetchRegistry: false

    serviceUrl:

      defaultZone: http://sc-eureka-cluster-server-node1:5001/eureka/,http://sc-eureka-cluster-server-node3:5003/eureka/

 

sc-eureka-cluster-server-node3

spring:

  application:

    name: sc-eureka-cluster-server-node3

   

server:

  port: 5003

 

eureka:

  instance:

    hostname: sc-eureka-cluster-server-node3

    lease-renewal-interval-in-seconds: 30

    lease-expiration-duration-in-seconds: 30

    prefer-ip-address: true

  client:

    registerWithEureka: false

    fetchRegistry: false

    serviceUrl:

      defaultZone: http://sc-eureka-cluster-server-node1:5001/eureka/,http://sc-eureka-cluster-server-node2:5001/eureka/

 

四、         配置host文件C:\Windows\System32\drivers\etc\hosts

127.0.0.1 sc-eureka-cluster-server-node1

127.0.0.1 sc-eureka-cluster-server-node2

127.0.0.1 sc-eureka-cluster-server-node3

 

五、         分別啓動EurekaServerApplication.java

sc-eureka-cluster-server-node1的日誌：

 

sc-eureka-cluster-server-node2的日誌：

 

sc-eureka-cluster-server-node3的日誌

 

若是出現上面圈住的日誌說明啓動成功

 

六、         在瀏覽器分別訪問

http://sc-eureka-cluster-server-node1:5001/

 

http://sc-eureka-cluster-server-node2:5002/

 

http://sc-eureka-cluster-server-node3:5002/

 

 

下面列出幾個重要的配置項類：

org.springframework.boot.autoconfigure.web.ServerProperties

org.springframework.cloud.netflix.eureka.EurekaInstanceConfigBean

com.netflix.eureka.EurekaServerConfig

com.netflix.eureka.DefaultEurekaServerConfig

org.springframework.cloud.netflix.eureka.server.EurekaServerConfigBean

com.netflix.discovery.EurekaClientConfig

com.netflix.discovery.DefaultEurekaClientConfig

org.springframework.cloud.netflix.eureka.EurekaClientConfigBean