How to avoid reuse of host when using external-dns

[TejasMadappa]

Hi,

I am not sure this is the right place to ask this question. please guide me on this below scenario.

We are using apiVersion: networking.istio.io/v1alpha3 for creation of VirtualService.

sample code:

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: subdomaintest2-internal-vs
  annotations:
    external-dns.alpha.kubernetes.io/target: test-istio-ingress-us-west-2.example.com
    external-dns.alpha.kubernetes.io/alias: "true"
    external-dns.alpha.kubernetes.io/set-identifier: US-WEST-2
    external-dns.alpha.kubernetes.io/aws-weight: "100"
spec:
  hosts:
  - test-samesubdomain.example.com
  gateways:
  - istio-system/istio-global-web-internal

This creates route53 records . Now what I want is, once test-samesubdomain.example.com record set is created, I don't want other Virtual services to use the same hostname. The virtual service creation should fail when it tries to use the same hostname. Is there way I can achieve that? I mean is there a flag or something I can set to achieve this?

Thanks in Advance.