terraform/platforms/aws: add option for creating a Route53 record to …

…front the ELB

terraform/platforms/aws/README.md

@@ -35,6 +35,8 @@ associate_public_ips = "true"
 subnets_ids = ["subnet-f438f793", "subnet-d4bea38c"]
 # ID of the VPC where the subnets are defined.
 vpc_id = "vpc-19f019"
+# Optional Route53 Zone ID under which an 'etcd' record should be created for client connections.
+route53_zone_id = ""
 # Defines whether the load balancer for etcd will be internet facing or internal.
 load_balancer_internal = "false"
 # List of the security group IDs to apply to the load balancer (ingress TCP 2379) (if empty, defaults to open to all).
@@ -88,6 +90,7 @@ module "eco" {
   associate_public_ip_address      = "true"
   subnets_ids                      = ["subnet-f438f793", "subnet-d4bea38c"]
   vpc_id                           = "vpc-19f019"
+  route53_zone_id                  = ""
   load_balancer_internal           = "false"
   load_balancer_security_group_ids = []
   metrics_security_group_ids       = []

terraform/platforms/aws/aws.tf

@@ -77,5 +77,5 @@ locals {
   snapshot_provider   = "s3"
   unseen_instance_ttl = "60s"
   snapshot_bucket     = "${aws_s3_bucket.backups.bucket}"
-  advertise_address   = "${aws_elb.clients.dns_name}"
+  advertise_address   = "${var.route53_zone_id != "" ? aws_route53_record.elb.name : aws_elb.clients.dns_name }"
 }

terraform/platforms/aws/output.tf

@@ -13,5 +13,5 @@
 // limitations under the License.
 
 output "etcd_address" {
-  value = "${var.eco_enable_tls == true ? "https" : "http"}://${aws_elb.clients.dns_name}:2379"
+  value = "${var.eco_enable_tls == true ? "https" : "http"}://${var.route53_zone_id != "" ? join("", aws_route53_record.elb.*.name) : aws_elb.clients.dns_name}:2379"
 }

terraform/platforms/aws/route53.tf

@@ -0,0 +1,17 @@
+data "aws_route53_zone" "main" {
+  zone_id = "${var.route53_zone_id}"
+}
+
+resource "aws_route53_record" "elb" {
+  count = "${var.route53_zone_id != "" ? 1 : 0 }"
+
+  zone_id = "${data.aws_route53_zone.main.zone_id}"
+  name    = "etcd.${data.aws_route53_zone.main.name}"
+  type    = "A"
+
+  alias {
+    name                   = "${aws_elb.clients.dns_name}"
+    zone_id                = "${aws_elb.clients.zone_id}"
+    evaluate_target_health = true
+  }
+}

terraform/platforms/aws/variables.tf

@@ -41,6 +41,10 @@ variable "vpc_id" {
   description = "ID of the VPC where the subnets are defined."
 }
 
+variable "route53_zone_id" {
+  description = "Optional Route53 Zone ID under which an 'etcd' record should be created for client connections"
+}
+
 variable "load_balancer_internal" {
   description = "Defines whether the load balancer for etcd should be internet facing or internal"
 }