2、eureka注冊(cè)中心集群

公眾號(hào)： java樂(lè)園

1、 Eureka作為spring cloud的服務(wù)發(fā)現(xiàn)與注冊(cè)中心，在整個(gè)的微服務(wù)體系中，處于核心位置。單機(jī)模式下的eureka服務(wù)，顯然不能滿足高可用的實(shí)際生產(chǎn)環(huán)境，這就要求配置一個(gè)能夠應(yīng)對(duì)各種突發(fā)情況，具有較強(qiáng)容災(zāi)能力的eureka服務(wù)。Eureka通過(guò)“伙伴機(jī)制”實(shí)現(xiàn)高可用。每一臺(tái)Eureka都需要在配置中指定另外兩個(gè)Eureka的地址伙伴，Eureka啟動(dòng)時(shí)會(huì)向自己的伙伴節(jié)點(diǎn)獲取當(dāng)前已經(jīng)存在的注冊(cè)表，這樣在向Eureka集群中新加機(jī)器時(shí)就不需要擔(dān)心注冊(cè)表的不完整。
2、 新建三個(gè)maven項(xiàng)目，分別為sc-eureka-cluster-server-node1，sc-eureka-cluster-server-node2，sc-eureka-cluster-server-node3。項(xiàng)目結(jié)構(gòu)如下：

備注：pom.xml和EurekaServerApplication.java的內(nèi)容給單機(jī)模式是一模一樣的，請(qǐng)參考上篇文章。
3、 主要看下bootstap.yml或者application.yml文件的改動(dòng)
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

5、 分別啟動(dòng)EurekaServerApplication.java
sc-eureka-cluster-server-node1的日志：

sc-eureka-cluster-server-node2的日志：

sc-eureka-cluster-server-node3的日志

如果出現(xiàn)上面圈住的日志說(shuō)明啟動(dòng)成功

6、 在瀏覽器分別訪問(wèn)
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(gè)重要的配置項(xiàng)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