按来源服务分流

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: nginx-default-v2
  namespace: lizhe
spec: 
  hosts:
  - nginx-service
  http:
  - match:
    - sourceLabels:
        app: v2
    route: 
    - destination:
        host: nginx-service
        subset: v2
  - match:
    - sourceLabels:
        app: v3
    route: 
    - destination:
        host: nginx-service
        subset: v3
  - route: 
    - destination: 
        host: nginx-service
        subset: v1

然后我们给 nginx 打个label

然后去把label改成 v3