Dubbo版本：Dubbo3

实验环境：

k8s 版本：1.17.6

istio版本： 1.7.3

一、资源对象的准备

1.创建独立的命名空间，并开启sidecar自动注入

apiVersion: v1
kind: Namespace
metadata:
  name: dubbo-demo
  labels:
    istio-injection: enable  #开启sidecar自动注入

2.部署生产者V1(provider-v1)

生产者V1 service

apiVersion: v1
kind: Service
metadata:
  name: dubbo-samples-mesh-provider
  namespace: dubbo-demo
spec:
  type: ClusterIP
  sessionAffinity: None
  selector:
    app: dubbo-samples-mesh-provider
  ports:
    - name: grpc-tri
      port: 50052
      targetPort: 50052

生产者V1 deployment

apiVersion: apps/v1
kind: Deployment
metadata:
  name: dubbo-samples-mesh-provider-v1
  namespace: dubbo-demo
spec:
  replicas: 2
  selector:
    matchLabels:
      app: dubbo-samples-mesh-provider
      version: v1
  template:
    metadata:
      labels:
        app: dubbo-samples-mesh-provider
        version: v1
      annotations:
        sidecar.istio.io/rewriteAppHTTPProbers: "false"      # Prevent istio rewrite http probe
    spec:
      containers:
        - name: server
          image: apache/dubbo-demo:dubbo-samples-mesh-provider-v1_0.0.1
          imagePullPolicy: Always
          ports:
            - name: grpc-tri
              containerPort: 50052
              protocol: TCP
            - name: http-health
              containerPort: 22222
              protocol: TCP
          livenessProbe:
            ......
          readinessProbe:
            ......
          startupProbe:
           ......

pod中的两个容器分别如下：其中 server容器为业务容器

3. 部署消费者(consumer)

部署消费者 service

apiVersion: v1
kind: Service
metadata:
  name: dubbo-samples-mesh-consumer
  namespace: dubbo-demo
spec:
  type: ClusterIP
  sessionAffinity: None
  selector:
    app: dubbo-samples-mesh-consumer
  ports:
    - name: grpc-dubbo
      protocol: TCP
      port: 50052
      targetPort: 50052

 部署消费者deployment

apiVersion: apps/v1
kind: Deployment
metadata:
  name: dubbo-samples-mesh-consumer
  namespace: dubbo-demo
spec:
  replicas: 1
  selector:
    matchLabels:
      app: dubbo-samples-mesh-consumer
      version: v1
  template:
    metadata:
      labels:
        app: dubbo-samples-mesh-consumer
        version: v1
      annotations:
        sidecar.istio.io/rewriteAppHTTPProbers: "false"
    spec:
      containers:
        - name: server
          image: hub.guazi-cloud.com/lichun4/dubbo-demo2:v1
          imagePullPolicy: Always
          ports:
            - name: grpc-tri
              containerPort: 50052
              protocol: TCP
            - name: http-health
              containerPort: 22222
              protocol: TCP
          env:
            - name: POD_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
          livenessProbe:
              ......
          readinessProbe:
              ......
          startupProbe:
              ......

 pod中的两个容器分别如下：其中 server容器为业务容器

4.部署生产者V2(provider-v2)

provider-v2-deployment

apiVersion: apps/v1
kind: Deployment
metadata:
  name: dubbo-samples-mesh-provider-v2
  namespace: dubbo-demo
spec:
  replicas: 2
  selector:
    matchLabels:
      app: dubbo-samples-mesh-provider
      version: v2
  template:
    metadata:
      labels:
        app: dubbo-samples-mesh-provider
        version: v2
      annotations:
        sidecar.istio.io/rewriteAppHTTPProbers: "false"
    spec:
      containers:
        - name: server
          image: apache/dubbo-demo:dubbo-samples-mesh-provider-v2_0.0.1
          imagePullPolicy: Always
          ports:
            - name: grpc-tri
              containerPort: 50052
              protocol: TCP
            - name: http-health
              containerPort: 22222
              protocol: TCP
          livenessProbe:
             ......
          readinessProbe:
             ......
          startupProbe:
             ......

 5.部署DR、VS

DR:

apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: dubbo-samples-mesh-provider
  namespace: dubbo-demo
spec:
  host: dubbo-samples-mesh-provider.dubbo-demo.svc.cluster.local
  trafficPolicy:
    loadBalancer:
      simple: ROUND_ROBIN
  subsets:
    - name: v1
      labels:
        version: v1
    - name: v2
      labels:
        version: v2

 VS:

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: dubbo-samples-mesh-provider
  namespace: dubbo-demo
spec:
  hosts:
    - dubbo-samples-mesh-provider.dubbo-demo.svc.cluster.local
  http:
    - route:
        - destination:
            host: dubbo-samples-mesh-provider.dubbo-demo.svc.cluster.local
            subset: v1
            port:
              number: 50052
          weight: 100
        - destination:
            host: dubbo-samples-mesh-provider.dubbo-demo.svc.cluster.local
            subset: v2
            port:
              number: 50052
          weight: 0

二、切流实验

当前VS权重比例  provider-v1:provider-v2 = 100:0

查看消费者业务容器日志

kc logs -f dubbo-samples-mesh-consumer-7778c46d5b-kztl5 -n  dubbo-demo -c server

可观察到，消费者仅消费生产者V1生产的数据，符合预期

调整VS权重比例  provider-v1:provider-v2 = 50:50

查看消费者业务容器日志

可观察到，消费者既消费生产者V1的数据，又消费生产者V2的数据，比率大概为1:1，符合预期 

注意：示例中，生产者消费者都属于同一个namespace；如果需要调用不同的namespace的提供者，需要按如下配置(dubbo版本>=3.1.2)：

注解方式：

@DubboReference(providedBy = "istio-demo-dubbo-producer",providerPort = 20885, providerNamespace = "istio-demo")

xml方式：

<dubbo:reference id="demoService" check="true"
                  interface="org.apache.dubbo.samples.basic.api.DemoService"
                  provider-port="20885"
                  provided-by="istio-dubbo-producer"
                  provider-namespace="istio-demo"/>

 注：参考文章进行实验：Dubbo proxy mesh using Envoy & Istio | Apache Dubbo