二、eureka註冊中心叢集
Spring Cloud 2.x系列之 eureka註冊中心叢集
1、 Eureka作為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,顯然不能滿足高可用的實際生產環境,這就要求配置一個能夠應對各種突發情況,具有較強容災能力的eureka服務。Eureka通過“夥伴機制”實現高可用。每一臺Eureka都需要在配置中指定另外兩個Eureka的地址夥伴,Eureka啟動時會向自己的夥伴節點獲取當前已經存在的登錄檔,這樣在向Eureka叢集中新加機器時就不需要擔心登錄檔的不完整。
2、 新建三個maven專案,分別為sc-eureka-cluster-server-node1,sc-eureka-cluster-server-node2,sc-eureka-cluster-server-node3。專案結構如下:
備註:pom.xml和EurekaServerApplication.java的內容給單機模式是一模一樣的,請參考上篇文章。
3、 主要看下bootstap.yml或者application.yml檔案的改動
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/
4、 配置host檔案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
5、 分別啟動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
如果出現上面圈住的日誌說明啟動成功
6、 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
原始碼:
https://gitee.com/hjj520/spring-cloud-2.x
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