AWS NLB over Helm in Terraform - how to find DNS name? - terraform

Question

I am using Helm chart provisioned by Terraform which creates Network Load Balancer, but I do not know how to get DNS name of this balancer so I can create Route53 records in Terraform for it.
If I can get it's ARN, I can call it over data block and read dns_name, however there is nothing like thit that Helm can return for me.
Do you have any suggestions?
I would like to keep it as IaC as possible
PS: I am passing some values to Helm chart so it's creating NLB, native functionality of this Chart is to create Classic LB.
service.beta.kubernetes.io/aws-load-balancer-type: nlb

Answer 1

I just found and answer, it's simple using:
Note: I had to specify namespace, otherwise was service null (not found).
data "kubernetes_service" "ingress_nginx" {
metadata {
name = "ingress-nginx-controller"
namespace = "kube-system"
}
}
output "k8s_service_ingress" {
description = "External DN name of load balancer"
value = data.kubernetes_service.ingress_nginx.status.0.load_balancer.0.ingress.0.hostname
}
It can be found in official docs too - https://registry.terraform.io/providers/hashicorp/kubernetes/latest/docs/data-sources/service

Answer 2

I had to use kubernetes_ingress_v1 so to create a Route 53 entry for the ingress hostname:
data "kubernetes_ingress_v1" "this" {
metadata {
name = "ingress-myservice"
namespace = "myservice"
}
depends_on = [
module.myservice-eks
]
}
resource "aws_route53_record" "this" {
zone_id = local.route53_zone_id
name = "whatever.myservice.com"
type = "CNAME"
ttl = "300"
records = [data.kubernetes_ingress_v1.this.status.0.load_balancer.0.ingress.0.hostname]
}