搭建Eureka - 分区

谁践踏了优雅 2024-04-17 05:48 63阅读 0赞

## 分区 ##

对于一个用户量比较大或者地理位置分布范围很广的项目。跨地区调用时，延时比较大。我们可以通过同一个机房的服务优先调用同一个机房的服务,当本机房的服务不可用的时候，才会调用其他机房的服务。

### Eureka中的分区概念 ###

eureka提供了region和zone两个概念。

*  region: 地区。比如亚洲地区,欧洲地区。
 *  zone: region内的某个机房。

## 我的使用案例 ##

几个同事一起开发一个项目，服务数量比较多，本机开发，启动所有服务，机器会比较卡。我就考虑大家集中注册到一个eureka中,但是这样服务就会互相干扰。但是分区这种配置正好符合我的场景。

我们使用调试服务的时候，就在自己的机器上启动对应服务,进行调试,这样会调用自己的服务。  
而调用正常的服务的时候，只要有一个人启动服务，就可以了。我们其他人就也可以调用了。

## 搭建实例代码 ##

*  application-peer.yml

spring:
      application:
        # 指定应用的名称
        name: fxb-eureka-superman
    
    server:
      port: ${ eureka_port:8760}
    
    eureka:
      instance:
        hostname: fxb-eureka-peer0
        # 更趋向IP地址
        prefer-ip-address: true
    # status-page-url-path: /actuator/info
    # health-check-url-path: /actuator/health
        secure-virtual-host-name: fxb.com
        virtual-host-name: moyang.com
        metadata-map:
            zone: superman
      client:
        service-url:
          wangxiyue: http://${ USER_NAME:moyang}:${ PASSWORD:moyang}@${ ASHURA_PEER1:fxb-eureka-peer1}:8761/eureka
          lipu_f: http://${ USER_NAME:moyang}:${ PASSWORD:moyang}@${ ASHURA_PEER2:fxb-eureka-peer2}:8762/eureka
          fengtiecheng: http://${ USER_NAME:moyang}:${ PASSWORD:moyang}@${ ASHURA_PEER3:fxb-eureka-peer3}:8763/eureka
          wangxiaowei_dev: http://${ USER_NAME:moyang}:${ PASSWORD:moyang}@${ ASHURA_PEER4:fxb-eureka-peer4}:8764/eureka
          superman: http://${ USER_NAME:moyang}:${ PASSWORD:moyang}@${ ASHURA_PEER0:fxb-eureka-peer0}:8760/eureka
        # eureka client 刷新本地刷新时间，默认30s
        registry-fetch-interval-seconds: 5
        register-with-eureka: true
        fetch-registry: true
        # 更趋向同一zone的eureka
        prefer-same-zone-eureka: true
        region: beijing
        availability-zones:
          beijing: wangxiyue,superman,lipu_f,fengtiecheng,wangxiaowei_dev
      server:
        # eureka server 刷新read cache Map 的时间
        # 注意，client读取的是readCacheMap，这个时间决定了多久会把readWriteCacheMap的缓存更新到readCacheMap上，默认30秒
        response-cache-update-interval-ms: 30000
        #eureka server缓存readWriteCacheMap失效时间，这个只有在这个时间过去后缓存才会失效，失效前不会更新，过期后从registry重新读取注册服务信息，registry是一个ConcurrentHashMap。
        #由于启用了evict其实就用不太上改这个配置了
        #默认180s
        response-cache-auto-expiration-in-seconds: 180
        # 启动主动失效，并且每次主动失效检测时间间隔为3s
        eviction-interval-timer-in-ms: 3000
    management:
      endpoints:
        web:
          exposure:
            include: "*"
      endpoint:
        health:
          show-details: always
    
    logging:
      level:
        root: INFO

*  application-peer1.yml

spring:
      application:
        # 指定应用的名称
        name: fxb-eureka-wangxiyue
    
    server:
      port: ${ eureka_port:8761}
    
    eureka:
      instance:
        hostname: fxb-eureka-peer1
        # 更趋向IP地址
        prefer-ip-address: true
    # status-page-url-path: /actuator/info
    # health-check-url-path: /actuator/health
        secure-virtual-host-name: fxb.com
        virtual-host-name: moyang.com
        metadata-map:
          zone: wangxiyue
      client:
        service-url:
          superman: http://${ USER_NAME:moyang}:${ PASSWORD:moyang}@${ ASHURA_PEER0:fxb-eureka-peer0}:8760/eureka
          wangxiyue: http://${ USER_NAME:moyang}:${ PASSWORD:moyang}@${ ASHURA_PEER1:fxb-eureka-peer1}:8761/eureka
          lipu_f: http://${ USER_NAME:moyang}:${ PASSWORD:moyang}@${ ASHURA_PEER2:fxb-eureka-peer2}:8762/eureka
          fengtiecheng: http://${ USER_NAME:moyang}:${ PASSWORD:moyang}@${ ASHURA_PEER3:fxb-eureka-peer3}:8763/eureka
          wangxiaowei_dev: http://${ USER_NAME:moyang}:${ PASSWORD:moyang}@${ ASHURA_PEER4:fxb-eureka-peer4}:8764/eureka
        # eureka client 刷新本地刷新时间，默认30s
        registry-fetch-interval-seconds: 5
        register-with-eureka: true
        fetch-registry: true
        # 更趋向同一zone的eureka
        prefer-same-zone-eureka: true
        region: beijing
        availability-zones:
          beijing: superman,wangxiyue,lipu_f,fengtiecheng,wangxiaowei_dev
      server:
        # eureka server 刷新read cache Map 的时间
        # 注意，client读取的是readCacheMap，这个时间决定了多久会把readWriteCacheMap的缓存更新到readCacheMap上，默认30秒
        response-cache-update-interval-ms: 30000
        #eureka server缓存readWriteCacheMap失效时间，这个只有在这个时间过去后缓存才会失效，失效前不会更新，过期后从registry重新读取注册服务信息，registry是一个ConcurrentHashMap。
        #由于启用了evict其实就用不太上改这个配置了
        #默认180s
        response-cache-auto-expiration-in-seconds: 180
        # 启动主动失效，并且每次主动失效检测时间间隔为3s
        eviction-interval-timer-in-ms: 3000
    management:
      endpoints:
        web:
          exposure:
            include: "*"
      endpoint:
        health:
          show-details: always
    
    logging:
      level:
        root: INFO

*  application-peer2.yml

spring:
      application:
        # 指定应用的名称
        name: fxb-eureka-lipu_f
    
    server:
      port: ${ eureka_port:8762}
    
    eureka:
      instance:
        hostname: fxb-eureka-peer2
        # 更趋向IP地址
        prefer-ip-address: true
    # status-page-url-path: /actuator/info
    # health-check-url-path: /actuator/health
        secure-virtual-host-name: fxb.com
        virtual-host-name: moyang.com
        metadata-map:
          zone: lipu_f
      client:
        service-url:
          superman: http://${ USER_NAME:moyang}:${ PASSWORD:moyang}@${ ASHURA_PEER0:fxb-eureka-peer0}:8760/eureka
          wangxiyue: http://${ USER_NAME:moyang}:${ PASSWORD:moyang}@${ ASHURA_PEER1:fxb-eureka-peer1}:8761/eureka
          lipu_f: http://${ USER_NAME:moyang}:${ PASSWORD:moyang}@${ ASHURA_PEER2:fxb-eureka-peer2}:8762/eureka
          fengtiecheng: http://${ USER_NAME:moyang}:${ PASSWORD:moyang}@${ ASHURA_PEER3:fxb-eureka-peer3}:8763/eureka
          wangxiaowei_dev: http://${ USER_NAME:moyang}:${ PASSWORD:moyang}@${ ASHURA_PEER4:fxb-eureka-peer4}:8764/eureka
        # eureka client 刷新本地刷新时间，默认30s
        registry-fetch-interval-seconds: 5
        register-with-eureka: true
        fetch-registry: true
        # 更趋向同一zone的eureka
        prefer-same-zone-eureka: true
        region: beijing
        availability-zones:
          beijing: wangxiyue,superman,lipu_f,fengtiecheng,wangxiaowei_dev
      server:
        # eureka server 刷新read cache Map 的时间
        # 注意，client读取的是readCacheMap，这个时间决定了多久会把readWriteCacheMap的缓存更新到readCacheMap上，默认30秒
        response-cache-update-interval-ms: 30000
        #eureka server缓存readWriteCacheMap失效时间，这个只有在这个时间过去后缓存才会失效，失效前不会更新，过期后从registry重新读取注册服务信息，registry是一个ConcurrentHashMap。
        #由于启用了evict其实就用不太上改这个配置了
        #默认180s
        response-cache-auto-expiration-in-seconds: 180
        # 启动主动失效，并且每次主动失效检测时间间隔为3s
        eviction-interval-timer-in-ms: 3000
    management:
      endpoints:
        web:
          exposure:
            include: "*"
      endpoint:
        health:
          show-details: always
    
    logging:
      level:
        root: INFO

*  application-peer3.yml

spring:
      application:
        # 指定应用的名称
        name: fxb-eureka-fengtiecheng
    
    server:
      port: ${ eureka_port:8763}
    
    eureka:
      instance:
        hostname: fxb-eureka-peer3
        # 更趋向IP地址
        prefer-ip-address: true
    # status-page-url-path: /actuator/info
    # health-check-url-path: /actuator/health
        secure-virtual-host-name: fxb.com
        virtual-host-name: moyang.com
        metadata-map:
          zone: fengtiecheng
      client:
        service-url:
          superman: http://${ USER_NAME:moyang}:${ PASSWORD:moyang}@${ ASHURA_PEER0:fxb-eureka-peer0}:8760/eureka
          wangxiyue: http://${ USER_NAME:moyang}:${ PASSWORD:moyang}@${ ASHURA_PEER1:fxb-eureka-peer1}:8761/eureka
          lipu_f: http://${ USER_NAME:moyang}:${ PASSWORD:moyang}@${ ASHURA_PEER2:fxb-eureka-peer2}:8762/eureka
          fengtiecheng: http://${ USER_NAME:moyang}:${ PASSWORD:moyang}@${ ASHURA_PEER3:fxb-eureka-peer3}:8763/eureka
          wangxiaowei_dev: http://${ USER_NAME:moyang}:${ PASSWORD:moyang}@${ ASHURA_PEER4:fxb-eureka-peer4}:8764/eureka
        # eureka client 刷新本地刷新时间，默认30s
        registry-fetch-interval-seconds: 5
        register-with-eureka: true
        fetch-registry: true
        # 更趋向同一zone的eureka
        prefer-same-zone-eureka: true
        region: beijing
        availability-zones:
          beijing: lipu_f,superman,wangxiyue,fengtiecheng,wangxiaowei_dev
      server:
        # eureka server 刷新read cache Map 的时间
        # 注意，client读取的是readCacheMap，这个时间决定了多久会把readWriteCacheMap的缓存更新到readCacheMap上，默认30秒
        response-cache-update-interval-ms: 30000
        #eureka server缓存readWriteCacheMap失效时间，这个只有在这个时间过去后缓存才会失效，失效前不会更新，过期后从registry重新读取注册服务信息，registry是一个ConcurrentHashMap。
        #由于启用了evict其实就用不太上改这个配置了
        #默认180s
        response-cache-auto-expiration-in-seconds: 180
        # 启动主动失效，并且每次主动失效检测时间间隔为3s
        eviction-interval-timer-in-ms: 3000
    management:
      endpoints:
        web:
          exposure:
            include: "*"
      endpoint:
        health:
          show-details: always
    
    logging:
      level:
        root: INFO

*  application-peer4.yml

spring:
      application:
        # 指定应用的名称
        name: fxb-eureka-wangxiaowei_dev
    
    server:
      port: ${ eureka_port:8764}
    
    eureka:
      instance:
        hostname: fxb-eureka-peer4
        # 更趋向IP地址
        prefer-ip-address: true
    # status-page-url-path: /actuator/info
    # health-check-url-path: /actuator/health
        secure-virtual-host-name: fxb.com
        virtual-host-name: moyang.com
        metadata-map:
          zone: wangxiaowei_dev
      client:
        service-url:
          superman: http://${ USER_NAME:moyang}:${ PASSWORD:moyang}@${ ASHURA_PEER0:fxb-eureka-peer0}:8760/eureka
          wangxiyue: http://${ USER_NAME:moyang}:${ PASSWORD:moyang}@${ ASHURA_PEER1:fxb-eureka-peer1}:8761/eureka
          lipu_f: http://${ USER_NAME:moyang}:${ PASSWORD:moyang}@${ ASHURA_PEER2:fxb-eureka-peer2}:8762/eureka
          fengtiecheng: http://${ USER_NAME:moyang}:${ PASSWORD:moyang}@${ ASHURA_PEER3:fxb-eureka-peer3}:8763/eureka
          wangxiaowei_dev: http://${ USER_NAME:moyang}:${ PASSWORD:moyang}@${ ASHURA_PEER4:fxb-eureka-peer4}:8764/eureka
        # eureka client 刷新本地刷新时间，默认30s
        registry-fetch-interval-seconds: 5
        register-with-eureka: true
        fetch-registry: true
        # 更趋向同一zone的eureka
        prefer-same-zone-eureka: true
        region: beijing
        availability-zones:
          beijing: fengtiecheng,superman,wangxiyue,lipu_f,wangxiaowei_dev
      server:
        # eureka server 刷新read cache Map 的时间
        # 注意，client读取的是readCacheMap，这个时间决定了多久会把readWriteCacheMap的缓存更新到readCacheMap上，默认30秒
        response-cache-update-interval-ms: 30000
        #eureka server缓存readWriteCacheMap失效时间，这个只有在这个时间过去后缓存才会失效，失效前不会更新，过期后从registry重新读取注册服务信息，registry是一个ConcurrentHashMap。
        #由于启用了evict其实就用不太上改这个配置了
        #默认180s
        response-cache-auto-expiration-in-seconds: 180
        # 启动主动失效，并且每次主动失效检测时间间隔为3s
        eviction-interval-timer-in-ms: 3000
    management:
      endpoints:
        web:
          exposure:
            include: "*"
      endpoint:
        health:
          show-details: always
    
    logging:
      level:
        root: INFO

### 注册逻辑 ###

*  `prefer-same-zone-eureka`为`false`, 按照`service-url`的`list`第一个注册中心,并和其维持心跳检测.不会再向`list`中的其他注册中心注册和维持心跳. 只有在第一个注册失败的情况下,才会依次向其他注册中心注册。总共会注册三次,如果三次都没有成功,就会注册失败。每隔一个心跳时间，就会再次尝试了。
 *  如果`prefer-same-zone-eureka`为`true`，先通过`region`取`availability-zones`内的第一个`zone`，然后通过这个`zone`取`service-url`下的`list`，并向`list`内的第一个注册中心进行注册和维持心跳，不会再向list内的其它的注册中心注册和维持心跳。只有在第一个注册失败的情况下，才会依次向其它的注册中心注册，总共重试`3`次，如果`3`个`service-url`都没有注册成功，则注册失败。每隔一个心跳时间，会再次尝试。

### 注意 ###

为了保证服务注册到同一个zone的注册中心,一定要注意availability-zones的顺序,必须要把同一个zone写在前面。

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