ServiceComb Pack 0.4.0 Integrated Discovery Service : Eureka

ServiceComb Pack supports the registration of Alpha service instances to Eureka from version 0.4.0, and Omega-side programs can visit Alpha with Eureka

Compile with Eureka

Pack doesn’t include Eureka support by default，you can use profile -Pspring-cloud-eureka to enable the feature of eureka when building the code of Pack.

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

Run Eureka

• Start Eureka with Docker, please refer to the official website https://cloud.spring.io for more information.

docker run -d -p 8761:8761 springcloud/eureka

• Eureka UI

Visit http://0.0.0.0:8761 in the browser, you can see the following page shows that Eureka is started successfully

Run Alpha

Enable registration to Eureka with the configuration of eureka.client.enabled=true

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 

Note: Check out for Eureka more details Spring Cloud Netflix 2.x Spring Cloud Netflix 1.x

After Alpha is launched, you can see that you have registered to Eureka

Use curl http://127.0.0.1:8761/eureka/apps/ You can see that Alpha’s gRPC service address and port have been registered in Eureka’s Metadata

<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>

Configuring the Omega side

ServiceComb Pack 0.4.0 Omega defaults use Spring Boot 2.x Spring and Spring Cloud Netflix 2.x, If your Omega side project base on Spring Boot 1.x you can use -Pspring-boot-1 to rebuild ServiceComb Pack to Spring Boot 1.x and Spring Cloud Netflix 1.x

Modify the original omega project

add dependencies

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

Add the following to application.yaml

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

• eureka.client.service-url.defaultZone property is set to the Eureka server’s instance address, check out Spring Boot’s  Spring Cloud Netflix 2.x or Spring Cloud Netflix 1.x for more details.

• alpha.cluster.register.type=eureka property is omega gets alpha gRPC address from Eureka

• spring boot version compatible

If your project is not using spring boot 2.1.1, please refer to this list to add a compatible spring-cloud-starter-netflix-eureka-client version

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>