Get the address for an NGINX ingress controller's load balancer and create a route53 address for it.

route53-ingress.tf

resource "local_file" "get-ingress" {
  content     = <<EOF
$info=kubectl describe svc ingress-nginx-controller -n ingress-nginx

$string = $false
foreach($line in $info) {
    if ($line -like "LoadBalancer Ingress:*") {
        $string = $line -replace "LoadBalancer Ingress:", ""
        $string=$string.trim()
        break
    }
}

Write-Output "{ ""elb"" : ""$string""}"
EOF
  filename = "${path.module}/get-ingress.ps1"
}

data "external" "get-ingress" {
  program = ["Powershell.exe", local_file.get-ingress.filename]
  query = {}
}

resource "aws_route53_record" "url" {
  zone_id = <r53 zone id>
  name    = <subdomain name>
  type    = "A"
  alias {
    evaluate_target_health = false
    name = data.external.get-ingress.result.elb
    zone_id = <elb zone>
  }
}