Added support form minimum_load_balancer_capacity.

stefangluszek · stefangluszek · commit a329f5e75528 · 2025-06-13T10:55:13.000+02:00
Support for `minimum_load_balancer_capacity` was added to terraform-provider-aws [v5.99.0](https://github.com/hashicorp/terraform-provider-aws/releases/tag/v5.99.0). If you have an ALB with minimum load balancer capacity configured applying the `terraform-aws-modules/alb/aws` with the lastest version of terraform-provider-aws would result in the setting being wiped out.
diff --git a/README.md b/README.md
@@ -352,13 +352,13 @@ See [patterns.md](https://github.com/terraform-aws-modules/terraform-aws-alb/blo
 | Name | Version |
 |------|---------|
 | <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 1.0 |
-| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 5.93 |
+| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 5.99 |
 
 ## Providers
 
 | Name | Version |
 |------|---------|
-| <a name="provider_aws"></a> [aws](#provider\_aws) | >= 5.93 |
+| <a name="provider_aws"></a> [aws](#provider\_aws) | >= 5.99 |
 
 ## Modules
 
@@ -414,6 +414,7 @@ No modules.
 | <a name="input_ipam_pools"></a> [ipam\_pools](#input\_ipam\_pools) | The IPAM pools to use with the load balancer | `map(string)` | `{}` | no |
 | <a name="input_listeners"></a> [listeners](#input\_listeners) | Map of listener configurations to create | `any` | `{}` | no |
 | <a name="input_load_balancer_type"></a> [load\_balancer\_type](#input\_load\_balancer\_type) | The type of load balancer to create. Possible values are `application`, `gateway`, or `network`. The default value is `application` | `string` | `"application"` | no |
+| <a name="input_minimum_load_balancer_capacity"></a> [minimum_load_balancer_capacity](#input\_minimum\_load\_balancer\_capacity) | Minimum capacity for a load balancer. Only valid for Load Balancers of type `application` or `network`. | `number` | `null` | no |
 | <a name="input_name"></a> [name](#input\_name) | The name of the LB. This name must be unique within your AWS account, can have a maximum of 32 characters, must contain only alphanumeric characters or hyphens, and must not begin or end with a hyphen | `string` | `null` | no |
 | <a name="input_name_prefix"></a> [name\_prefix](#input\_name\_prefix) | Creates a unique name beginning with the specified prefix. Conflicts with `name` | `string` | `null` | no |
 | <a name="input_preserve_host_header"></a> [preserve\_host\_header](#input\_preserve\_host\_header) | Indicates whether the Application Load Balancer should preserve the Host header in the HTTP request and send it to the target without any change. Defaults to `false` | `bool` | `null` | no |
diff --git a/examples/complete-alb/README.md b/examples/complete-alb/README.md
@@ -20,15 +20,15 @@ Note that this example may create resources which cost money. Run `terraform des
 | Name | Version |
 |------|---------|
 | <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 1.0 |
-| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 5.93 |
+| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 5.99 |
 | <a name="requirement_null"></a> [null](#requirement\_null) | >= 2.0 |
 | <a name="requirement_random"></a> [random](#requirement\_random) | >= 3.6 |
 
 ## Providers
 
 | Name | Version |
 |------|---------|
-| <a name="provider_aws"></a> [aws](#provider\_aws) | >= 5.93 |
+| <a name="provider_aws"></a> [aws](#provider\_aws) | >= 5.99 |
 | <a name="provider_null"></a> [null](#provider\_null) | >= 2.0 |
 | <a name="provider_random"></a> [random](#provider\_random) | >= 3.6 |
 
diff --git a/examples/complete-alb/main.tf b/examples/complete-alb/main.tf
@@ -71,6 +71,8 @@ module "alb" {
     ipv4_ipam_pool_id = aws_vpc_ipam_pool.this.id
   }
 
+  minimum_load_balancer_capacity = 10
+
   client_keep_alive = 7200
 
   listeners = {
diff --git a/examples/complete-alb/versions.tf b/examples/complete-alb/versions.tf
@@ -4,7 +4,7 @@ terraform {
   required_providers {
     aws = {
       source  = "hashicorp/aws"
-      version = ">= 5.93"
+      version = ">= 5.99"
     }
     null = {
       source  = "hashicorp/null"
diff --git a/examples/complete-nlb/README.md b/examples/complete-nlb/README.md
@@ -20,13 +20,13 @@ Note that this example may create resources which cost money. Run `terraform des
 | Name | Version |
 |------|---------|
 | <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 1.0 |
-| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 5.93 |
+| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 5.99 |
 
 ## Providers
 
 | Name | Version |
 |------|---------|
-| <a name="provider_aws"></a> [aws](#provider\_aws) | >= 5.93 |
+| <a name="provider_aws"></a> [aws](#provider\_aws) | >= 5.99 |
 
 ## Modules
 
diff --git a/examples/complete-nlb/versions.tf b/examples/complete-nlb/versions.tf
@@ -4,7 +4,7 @@ terraform {
   required_providers {
     aws = {
       source  = "hashicorp/aws"
-      version = ">= 5.93"
+      version = ">= 5.99"
     }
   }
 }
diff --git a/examples/mutual-auth-alb/README.md b/examples/mutual-auth-alb/README.md
@@ -21,15 +21,15 @@ Note that this example may create resources which cost money. Run `terraform des
 | Name | Version |
 |------|---------|
 | <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 1.0 |
-| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 5.93 |
+| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 5.99 |
 | <a name="requirement_null"></a> [null](#requirement\_null) | >= 2.0 |
 | <a name="requirement_tls"></a> [tls](#requirement\_tls) | >= 4.0 |
 
 ## Providers
 
 | Name | Version |
 |------|---------|
-| <a name="provider_aws"></a> [aws](#provider\_aws) | >= 5.93 |
+| <a name="provider_aws"></a> [aws](#provider\_aws) | >= 5.99 |
 | <a name="provider_null"></a> [null](#provider\_null) | >= 2.0 |
 | <a name="provider_tls"></a> [tls](#provider\_tls) | >= 4.0 |
 
diff --git a/examples/mutual-auth-alb/versions.tf b/examples/mutual-auth-alb/versions.tf
@@ -4,7 +4,7 @@ terraform {
   required_providers {
     aws = {
       source  = "hashicorp/aws"
-      version = ">= 5.93"
+      version = ">= 5.99"
     }
     null = {
       source  = "hashicorp/null"
diff --git a/main.tf b/main.tf
@@ -39,6 +39,14 @@ resource "aws_lb" "this" {
     }
   }
 
+  dynamic "minimum_load_balancer_capacity" {
+    for_each = var.minimum_load_balancer_capacity != null ? [var.minimum_load_balancer_capacity] : []
+
+    content {
+      capacity_units = minimum_load_balancer_capacity.value
+    }
+  }
+
   client_keep_alive                                            = var.client_keep_alive
   customer_owned_ipv4_pool                                     = var.customer_owned_ipv4_pool
   desync_mitigation_mode                                       = var.desync_mitigation_mode
diff --git a/modules/lb_trust_store/README.md b/modules/lb_trust_store/README.md
@@ -30,13 +30,13 @@ module "trust_store" {
 | Name | Version |
 |------|---------|
 | <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 1.0 |
-| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 5.93 |
+| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 5.99 |
 
 ## Providers
 
 | Name | Version |
 |------|---------|
-| <a name="provider_aws"></a> [aws](#provider\_aws) | >= 5.93 |
+| <a name="provider_aws"></a> [aws](#provider\_aws) | >= 5.99 |
 
 ## Modules
 
diff --git a/modules/lb_trust_store/versions.tf b/modules/lb_trust_store/versions.tf
@@ -4,7 +4,7 @@ terraform {
   required_providers {
     aws = {
       source  = "hashicorp/aws"
-      version = ">= 5.93"
+      version = ">= 5.99"
     }
   }
 }
diff --git a/variables.tf b/variables.tf
@@ -134,6 +134,16 @@ variable "enforce_security_group_inbound_rules_on_private_link_traffic" {
   default     = null
 }
 
+variable "minimum_load_balancer_capacity" {
+  description = "Minimum capacity for a load balancer. Only valid for Load Balancers of type `application` or `network`"
+  type        = number
+  default     = null
+  validation {
+    condition     = var.minimum_load_balancer_capacity == null || contains(["application", "network"], var.load_balancer_type)
+    error_message = "The minimum_load_balancer_capacity variable is only valid for load balancers of type 'application' or 'network'."
+  }
+}
+
 variable "name" {
   description = "The name of the LB. This name must be unique within your AWS account, can have a maximum of 32 characters, must contain only alphanumeric characters or hyphens, and must not begin or end with a hyphen"
   type        = string
diff --git a/versions.tf b/versions.tf
@@ -4,7 +4,7 @@ terraform {
   required_providers {
     aws = {
       source  = "hashicorp/aws"
-      version = ">= 5.93"
+      version = ">= 5.99"
     }
   }
 }
diff --git a/wrappers/lb_trust_store/versions.tf b/wrappers/lb_trust_store/versions.tf
@@ -4,7 +4,7 @@ terraform {
   required_providers {
     aws = {
       source  = "hashicorp/aws"
-      version = ">= 5.93"
+      version = ">= 5.99"
     }
   }
 }
diff --git a/wrappers/main.tf b/wrappers/main.tf
@@ -32,6 +32,7 @@ module "wrapper" {
   load_balancer_type                                           = try(each.value.load_balancer_type, var.defaults.load_balancer_type, "application")
   name                                                         = try(each.value.name, var.defaults.name, null)
   name_prefix                                                  = try(each.value.name_prefix, var.defaults.name_prefix, null)
+  minimum_load_balancer_capacity                               = try(each.value.minimum_load_balancer_capacity, var.defaults.minimum_load_balancer_capacity, null)
   preserve_host_header                                         = try(each.value.preserve_host_header, var.defaults.preserve_host_header, null)
   putin_khuylo                                                 = try(each.value.putin_khuylo, var.defaults.putin_khuylo, true)
   route53_records                                              = try(each.value.route53_records, var.defaults.route53_records, {})
diff --git a/wrappers/versions.tf b/wrappers/versions.tf
@@ -4,7 +4,7 @@ terraform {
   required_providers {
     aws = {
       source  = "hashicorp/aws"
-      version = ">= 5.93"
+      version = ">= 5.99"
     }
   }
 }

Original file line number	Diff line number	Diff line change
`@@ -71,6 +71,8 @@ module "alb" {`
`71`	`71`	`ipv4_ipam_pool_id = aws_vpc_ipam_pool.this.id`
`72`	`72`	`}`
`73`	`73`
	`74`	`+ minimum_load_balancer_capacity = 10`
	`75`	`+`
`74`	`76`	`client_keep_alive = 7200`
`75`	`77`
`76`	`78`	`listeners = {`
Original file line number	Diff line number	Diff line change
`@@ -4,7 +4,7 @@ terraform {`
`4`	`4`	`required_providers {`
`5`	`5`	`aws = {`
`6`	`6`	`source = "hashicorp/aws"`
`7`		`- version = ">= 5.93"`
	`7`	`+ version = ">= 5.99"`
`8`	`8`	`}`
`9`	`9`	`null = {`
`10`	`10`	`source = "hashicorp/null"`
Original file line number	Diff line number	Diff line change
`@@ -39,6 +39,14 @@ resource "aws_lb" "this" {`
`39`	`39`	`}`
`40`	`40`	`}`
`41`	`41`
	`42`	`+ dynamic "minimum_load_balancer_capacity" {`
	`43`	`+ for_each = var.minimum_load_balancer_capacity != null ? [var.minimum_load_balancer_capacity] : []`
	`44`	`+`
	`45`	`+ content {`
	`46`	`+ capacity_units = minimum_load_balancer_capacity.value`
	`47`	`+ }`
	`48`	`+ }`
	`49`	`+`
`42`	`50`	`client_keep_alive = var.client_keep_alive`
`43`	`51`	`customer_owned_ipv4_pool = var.customer_owned_ipv4_pool`
`44`	`52`	`desync_mitigation_mode = var.desync_mitigation_mode`