Is there a way to make two resources generate targets for the same Endpoint?

[Valgueiro]

We are doing the migration to use Gateway API after the decommission of Ingress Nginx. But, during the mean time, we want to generate the DNS sharing the load into both gateway LB and Ingress LB. Is there a way to do that with external DNS?

I was trying to search through the docs but it is not clear to me what is the best search string to find this information

[mg1986jp]

Yeah, external-dns can handle this — if you have both an Ingress and a Gateway (or HTTPRoute) pointing to the same hostname, external-dns will collect all the targets and merge them into one DNS record with multiple values. As long as both resources have the same external-dns.alpha.kubernetes.io/hostname annotation (or the hostnames match in the spec), it should just work.

One thing to watch out for: make sure you're running external-dns with both sources enabled, like --source=ingress --source=gateway-httproute. If you only have --source=ingress, it won't see the Gateway resources at all.

Also, depending on your DNS provider, you might want to check that the record type matches. If one resource generates A records and the other generates CNAME, that could cause issues since you can't mix A and CNAME on the same name.