Add istio ingress lb to outputs for use in dns creation

load_balancer_dns.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+# Script to get Load Balancer DNS Name based on the tag Name
+
+LB_NAME=$1
+
+lb_arn=$(for i in $(aws elbv2 describe-load-balancers --query 'LoadBalancers[].LoadBalancerArn' --output text); \
+do aws elbv2 describe-tags --resource-arns "$i" --query "TagDescriptions[?Tags[?Key=='Name' &&Value=='$LB_NAME']].ResourceArn" --output text ;done)
+
+if [ -z "$lb_arn" ]; then
+  lb_arn="no_arn_exists_for_this_lb_name"
+fi
+
+dns_name=$(aws elbv2 describe-load-balancers --load-balancer-arns $lb_arn --query 'LoadBalancers[].DNSName' --output text)
+
+jq -n --arg dnsName "$dns_name" '{"dnsName":$dnsName}'

main.tf

@@ -55,12 +55,6 @@ resource "kubernetes_namespace" "ns" {
   }
 }
 
-# data "kubernetes_service" "apiserver" {
-#   metadata {
-#     name = "kubernetes"
-#   }
-# }
-
 resource "helm_release" "base" {
   depends_on = [module.images]
   chart      = "base"
@@ -111,7 +105,6 @@ resource "helm_release" "istiod" {
   set {
     name  = "globalproxy.excludeIPRanges"
     value = "${var.kubernetes_service_apiserver}/32"
-    # value = "${data.kubernetes_service.apiserver.spec[0].cluster_ip}/32"
   }
 }
 
@@ -194,3 +187,16 @@ resource "helm_release" "egress" {
 
   timeout = 90
 }
+
+###################################################################
+# INGRESS NLB DATA
+###################################################################
+
+# We need to lookup the DNS entry for the istio ingress load balancer
+# This value is used to create the CNAME record for cluster app/api addressing in the DNS module
+# We use this external data source to avoid issues with running plans
+data "external" "load_balancer_dns" {
+  depends_on = [helm_release.ingress]
+
+  program    = ["bash", "${path.module}/load_balancer_dns.sh", format("%v-%v", var.cluster_name, "istio-ingress")]
+}

outputs.tf

@@ -11,3 +11,8 @@ output "module_version" {
   description = "The version of this module."
   value       = local.module_version
 }
+
+output "istio_ingress_lb" {
+  description = "The Istio ingress network load balancer."
+  value       = data.external.load_balancer_dns.result.dnsName
+}