Add variable to support setting cross-zone-load-balancing (#73)

Author: tanmng

README.md

@@ -111,6 +111,7 @@ MIT Licensed. See [LICENSE](https://github.com/terraform-aws-modules/terraform-a
 
 | Name | Description | Type | Default | Required |
 |------|-------------|:----:|:-----:|:-----:|
+| enable_cross_zone_load_balancing | Indicates whether cross zone load balancing should be enabled in application load balancers. | string | `false` | no |
 | enable_deletion_protection | If true, deletion of the load balancer will be disabled via the AWS API. This will prevent Terraform from deleting the load balancer. Defaults to false. | string | `false` | no |
 | enable_http2 | Indicates whether HTTP/2 is enabled in application load balancers. | string | `true` | no |
 | extra_ssl_certs | A list of maps describing any extra SSL certificates to apply to the HTTPS listeners. Required key/values: certificate_arn, https_listener_index (the index of the listener within https_listeners which the cert applies toward). | list | `<list>` | no |

alb_no_logs.tf

@@ -1,14 +1,15 @@
 resource "aws_lb" "application_no_logs" {
-  load_balancer_type         = "application"
-  name                       = "${var.load_balancer_name}"
-  internal                   = "${var.load_balancer_is_internal}"
-  security_groups            = ["${var.security_groups}"]
-  subnets                    = ["${var.subnets}"]
-  idle_timeout               = "${var.idle_timeout}"
-  enable_deletion_protection = "${var.enable_deletion_protection}"
-  enable_http2               = "${var.enable_http2}"
-  ip_address_type            = "${var.ip_address_type}"
-  tags                       = "${merge(var.tags, map("Name", var.load_balancer_name))}"
+  load_balancer_type               = "application"
+  name                             = "${var.load_balancer_name}"
+  internal                         = "${var.load_balancer_is_internal}"
+  security_groups                  = ["${var.security_groups}"]
+  subnets                          = ["${var.subnets}"]
+  idle_timeout                     = "${var.idle_timeout}"
+  enable_cross_zone_load_balancing = "${var.enable_cross_zone_load_balancing}"
+  enable_deletion_protection       = "${var.enable_deletion_protection}"
+  enable_http2                     = "${var.enable_http2}"
+  ip_address_type                  = "${var.ip_address_type}"
+  tags                             = "${merge(var.tags, map("Name", var.load_balancer_name))}"
 
   timeouts {
     create = "${var.load_balancer_create_timeout}"

alb_w_logs.tf

@@ -1,14 +1,15 @@
 resource "aws_lb" "application" {
-  load_balancer_type         = "application"
-  name                       = "${var.load_balancer_name}"
-  internal                   = "${var.load_balancer_is_internal}"
-  security_groups            = ["${var.security_groups}"]
-  subnets                    = ["${var.subnets}"]
-  idle_timeout               = "${var.idle_timeout}"
-  enable_deletion_protection = "${var.enable_deletion_protection}"
-  enable_http2               = "${var.enable_http2}"
-  ip_address_type            = "${var.ip_address_type}"
-  tags                       = "${merge(var.tags, map("Name", var.load_balancer_name))}"
+  load_balancer_type               = "application"
+  name                             = "${var.load_balancer_name}"
+  internal                         = "${var.load_balancer_is_internal}"
+  security_groups                  = ["${var.security_groups}"]
+  subnets                          = ["${var.subnets}"]
+  idle_timeout                     = "${var.idle_timeout}"
+  enable_cross_zone_load_balancing = "${var.enable_cross_zone_load_balancing}"
+  enable_deletion_protection       = "${var.enable_deletion_protection}"
+  enable_http2                     = "${var.enable_http2}"
+  ip_address_type                  = "${var.ip_address_type}"
+  tags                             = "${merge(var.tags, map("Name", var.load_balancer_name))}"
 
   access_logs {
     enabled = true

variables.tf

@@ -8,6 +8,11 @@ variable "enable_http2" {
   default     = true
 }
 
+variable "enable_cross_zone_load_balancing" {
+  description = "Indicates whether cross zone load balancing should be enabled in application load balancers."
+  default     = false
+}
+
 variable "extra_ssl_certs" {
   description = "A list of maps describing any extra SSL certificates to apply to the HTTPS listeners. Required key/values: certificate_arn, https_listener_index (the index of the listener within https_listeners which the cert applies toward)."
   type        = "list"