安装docker

https://www.docker.com/

安装minikube

墙裂推荐：https://kubernetes.io/zh-cn/docs/tutorials/hello-minikube/

安装istio

https://istio.io/latest/docs/setup/getting-started/

??? 安装 Istio 的时候需要开启 first-party-jwt 支持（使用 istioctl 工具安装的时候加上 --set values.global.jwtPolicy=first-party-jwt 参数），否则将导致客户端认证失败的问题。
参考命令如下：

curl -L https://istio.io/downloadIstio | sh -
cd istio-1.xx.x
export PATH=$PWD/bin:$PATH
istioctl install --set profile=demo --set values.global.jwtPolicy=first-party-jwt -y

代码准备

xds-provider

定义一个接口

public interface GreetingService {

    String sayHello(String name);
}

实现对应的接口

@DubboService(version = "1.0.0")
public class AnnotatedGreetingService implements GreetingService {

    @Override
    public String sayHello(String name) {
        System.out.println("greeting service received: " + name);
        return "hello, " + name + "! from host: " + NetUtils.getLocalHost();
    }
}

编写启动类

public class ProviderBootstrap {

    public static void main(String[] args) throws Exception {
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(ProviderConfiguration.class);
        context.start();
        System.out.println("dubbo service started");
        new CountDownLatch(1).await();
    }

    @Configuration
    @EnableDubbo(scanBasePackages = "org.apache.dubbo.samples.impl")
    @PropertySource("classpath:/spring/dubbo-provider.properties")
    static class ProviderConfiguration {
    }
}

编写配置信息

dubbo.application.name=dubbo-samples-xds-provider
# 由于 Dubbo 3 应用级服务发现的元数据无法从 istio 中获取，需要走服务自省模式。
# 这要求了 Dubbo MetadataService 的端口在全集群的是统一的。
dubbo.application.metadataServicePort=20885
# 走xds协议
dubbo.registry.address=xds://istiod.istio-system.svc:15012
dubbo.protocol.name=tri
dubbo.protocol.port=50051
# 对齐k8s pod生命周期，由于 Kubernetes probe 探活机制的工作原理限制，
# 探活请求的发起方不是 localhost，所以需要配置 qosAcceptForeignIp 参数开启允许全局访问
dubbo.application.qosEnable=true
dubbo.application.qosAcceptForeignIp=true

编写Deployment.yml和Service.yml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: dubbo-samples-xds-provider
  namespace: dubbo-demo
spec:
  replicas: 3
  selector:
    matchLabels:
      app: dubbo-samples-xds-provider
  template:
    metadata:
      labels:
        app: dubbo-samples-xds-provider
    spec:
      containers:
        - name: server
          image: apache/dubbo-demo:dubbo-samples-xds-provider_0.0.1
          livenessProbe:
            httpGet:
              path: /live
              port: 22222
            initialDelaySeconds: 5
            periodSeconds: 5
          readinessProbe:
            httpGet:
              path: /ready
              port: 22222
            initialDelaySeconds: 5
            periodSeconds: 5
          startupProbe:
            httpGet:
              path: /startup
              port: 22222
            failureThreshold: 30
            periodSeconds: 10

apiVersion: v1
kind: Service
metadata:
  name: dubbo-samples-xds-provider
  namespace: dubbo-demo
spec:
  clusterIP: None
  selector:
    app: dubbo-samples-xds-provider
  ports:
    - name: grpc
      protocol: TCP
      port: 50051
      targetPort: 50051

编写Dockerfile

FROM openjdk:8-jdk
ADD ./target/dubbo-samples-xds-provider-1.0-SNAPSHOT.jar dubbo-samples-xds-provider-1.0-SNAPSHOT.jar
CMD java -jar -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=31000 /dubbo-samples-xds-provider-1.0-SNAPSHOT.jar

xds-consumer

定义一个接口

public interface GreetingService {

    String sayHello(String name);
}

实现对应的接口