操作场景

随着网站流量的增加，网站开始有了广告投放的需求，广告投放需要在商品页面增加广告位。网站的开发人员新开发了 product 服务的 v2版本，以 product v2的 deployment 的形式提供，并希望对 product-v2版本做灰度发布

部署

部署v1和v2版本的deployment以及对应的service至集群

apiVersion: apps/v1
kind: Deployment
metadata:
  name: product-v2
  namespace: base
  labels:
    app: product
    version: v2
spec:
  replicas: 1
  selector:
    matchLabels:
      app: product
      version: v2
  template:
    metadata:
      labels:
        app: product
        version: v2
    spec:
      containers:
        - name: product
          image: nginx:1.25-alpine
          ports:
            - containerPort: 80
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: product-v1
  namespace: base
spec:
  replicas: 1
  selector:
    matchLabels:
      app: product
      version: v1
  template:
    metadata:
      labels:
        app: product
        version: v1
    spec:
      containers:
        - name: product
          image: nginx:1.25-alpine
          ports:
            - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  labels:
    app: product
  name: product
  namespace: base
spec:
  ports:
  - name: http
    port: 80
    protocol: TCP
    targetPort: 80
  selector:
    app: product
  type: ClusterIP

部署服务描述

通过 DR 定义服务版本 + 通过 VS 定义权重路由来完成灰度发布的第一步，将部分流量（50%）路由至 product v2 subset 以验证新版本，剩余部分（50%）的流量仍然路由至 product v1版本。将以下 YAML 文件提交至主集群即可完成以上设定

apiVersion: networking.istio.io/v1beta1
kind: VirtualService
metadata:
  name: product-vs
  namespace: base
spec:
  hosts:
    - "product.base.svc.cluster.local"
  http:
    - match:
        - uri:
            exact: /
      route:
        - destination:
            host: product.base.svc.cluster.local
            subset: v1
            port:
              number: 80
          weight: 50
        - destination:
            host: product.base.svc.cluster.local
            subset: v2
            port:
              number: 80
          weight: 50
---
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: product
  namespace: base
spec:
  host: product
  subsets:
    - name: v1
      labels:
        version: v1
    - name: v2
      labels:
        version: v2

配置完成后，访问 product 服务的流量将有 50%被路由至 v1 版本，50%被路由至 v2 版本，刷新网站商品页面即可验证。