apiVersion: networking.istio.io/v1beta1
kind: Gateway
metadata:
  name: app-backend-gateway
  namespace: istio
spec:
  selector:
    istio: ingressgateway
  servers:
    - port:
        number: 80
        name: http
        protocol: HTTP
      hosts:
        - "${APP_HOST}"
---
apiVersion: networking.istio.io/v1beta1
kind: VirtualService
metadata:
  name: app-backend-external
  namespace: istio
spec:
  hosts:
    - "${APP_HOST}"
  gateways:
    - app-backend-gateway
  http:
    - route:
        - destination:
            host: app-backend
            subset: v1
          weight: 90
        - destination:
            host: app-backend
            subset: v2
          weight: 10