text: apiVersion: networking.istio.io/v1alpha3
  kind: VirtualService
  metadata:
    name: istio-vs-demo
  spec:
    gateways:
    - demo-gw
    hosts:
    - "*"
    http:
    - match:
      - uri:
          prefix: /
      route:
      - destination:
          host: nginx # 事先新建 nginx 服务
          port:
            number: 80
  