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ServiceComb Pack 0.4.0 集成发现服务 : Spring Cloud Eureka

 3 years ago
source link: http://servicecomb.apache.org/cn/docs/servicecomb-pack-eureka/
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ServiceComb Pack 从 0.4.0 版本开始支持将 Alpha 服务实例注册到发现服务 Eureka 中，Omega 端的程序通过注册中心 Eureka 就可以连接 Alpha 服务

编译支持 Eureka 的版本

默认发行版不包含 Eureka 的支持，你需要使用 -Pspring-cloud-eureka 参数编译支持 Eureka 的版本

git clone https://github.com/apache/servicecomb-pack.git
cd servicecomb-pack
mvn clean install -DskipTests=true -Pspring-boot-2,spring-cloud-eureka

启动 Eureka

docker run -d -p 8761:8761 springcloud/eureka
  • 访问 Eureka UI

在浏览器中访问 http://0.0.0.0:8761 ，能看到如下页面表示 Eureka 启动成功

eureka_main

启动 Alpha

注册中心功能通过设置 eureka.client.enabled=true 参数开启

java -jar alpha-server-0.4.0-exec.jar \
  --server.port=8090 \
  --alpha.server.port=8080 \
  --spring.datasource.url="jdbc:postgresql://127.0.0.1:5432/saga?useSSL=false" \
  --spring.datasource.username=saga-user \
  --spring.datasource.password=saga-password \
  --eureka.client.enabled=true \
  --eureka.client.service-url.defaultZone=http://0.0.0.0:8761/eureka \
  --spring.profiles.active=prd

注意: 更多 eureka 参数请参考 Spring Cloud Netflix 2.x Spring Cloud Netflix 1.x

Alpha 启动完毕后可以看到已经注册到 Eureka

alpha_register_to_eureka

执行命令 curl http://127.0.0.1:8761/eureka/apps/ 可以看到已经将 Alpha 的 gRPC 地址和端口注册到 Eureka 的 Metadata 中

<applications>
  <versions__delta>1</versions__delta>
  <apps__hashcode>UP_1_</apps__hashcode>
  <application>
    <name>SERVICECOMB-ALPHA-SERVER</name>
    <instance>
      <hostName>10.50.8.23</hostName>
      <app>SERVICECOMB-ALPHA-SERVER</app>
      <ipAddr>10.50.8.23</ipAddr>
      <status>UP</status>
      <overriddenstatus>UNKNOWN</overriddenstatus>
      <port enabled="true">8090</port>
      <securePort enabled="false">443</securePort>
      <countryId>1</countryId>
      <dataCenterInfo class="com.netflix.appinfo.InstanceInfo$DefaultDataCenterInfo">
        <name>MyOwn</name>
      </dataCenterInfo>
      <leaseInfo>
        <renewalIntervalInSecs>30</renewalIntervalInSecs>
        <durationInSecs>90</durationInSecs>
        <registrationTimestamp>1555317761365</registrationTimestamp>
        <lastRenewalTimestamp>1555317761365</lastRenewalTimestamp>
        <evictionTimestamp>0</evictionTimestamp>
        <serviceUpTimestamp>1555317761067</serviceUpTimestamp>
      </leaseInfo>
      <metadata>
        <management.port>8090</management.port>
        <servicecomb-alpha-server>0.0.0.0:8080</servicecomb-alpha-server>
      </metadata>
      <homePageUrl>http://10.50.8.23:8090/</homePageUrl>
      <statusPageUrl>http://10.50.8.23:8090/actuator/info</statusPageUrl>
      <healthCheckUrl>http://10.50.8.23:8090/actuator/health</healthCheckUrl>
      <vipAddress>servicecomb-alpha-server</vipAddress>
      <secureVipAddress>servicecomb-alpha-server</secureVipAddress>
      <isCoordinatingDiscoveryServer>false</isCoordinatingDiscoveryServer>
      <lastUpdatedTimestamp>1555317761365</lastUpdatedTimestamp>
      <lastDirtyTimestamp>1555317760932</lastDirtyTimestamp>
      <actionType>ADDED</actionType>
    </instance>
  </application>
</applications>

配置 Omega 端

ServiceComb Pack 0.4.0 Omega 默认依赖 Spring Boot 2.x Spring 和 Spring Cloud Netflix 2.x ，如果你的 Omega 端项目依赖 Spring Boot 1.x 你可以使用 -Pspring-boot-1 参数重新编译 Spring Boot 1.x 和 Spring Cloud Netflix 1.x 的版本

修改原有 omega 端项目

增加以下依赖

<dependency>
  <groupId>org.apache.servicecomb.pack</groupId>
  <artifactId>omega-spring-cloud-eureka-starter</artifactId>
  <version>${pack.version}</version>
</dependency>

在 application.yaml 添加下面的配置项

eureka:
  client:
    service-url:
      defaultZone: http://127.0.0.1:8761/eureka
alpha:
  cluster:
    register:
      type: eureka

  • eureka.client.service-url.defaultZone 配置 Eureka 注册中心的地址，更多 Eureka 客户端配置可以参考Spring Cloud Netflix 2.x 或 Spring Cloud Netflix 1.x

  • alpha.cluster.register.type=eureka 配置 Omega 获取Alpha的方式是通过 Eureka 的注册中心

  • spring boot 版本兼容

    如果你的项目使用的不是 spring boot 2.1.1 版本，那么请参照此列表增加兼容的 spring-cloud-starter-consul-discovery 版本

    spring boot spring-cloud-starter-netflix-eureka-client 2.1.x.RELEASE 2.1.1.RELEASE 2.0.x.RELEASE 2.0.3.RELEASE 

    <dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
      <version>2.0.3.RELEASE</version>
    </dependency>
  </dependencies>
</dependencyManagement>

report

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