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。java
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:node
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。web
三、 主要看下bootstap.yml或者application.yml文件的改動spring
sc-eureka-cluster-server-node1瀏覽器
spring:app
application:eclipse
name: sc-eureka-cluster-server-node1maven
server:微服務
port: 5001fetch
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