terraform-aws-modules · michaelact · Sep 25, 2025 · Sep 25, 2025 · Sep 25, 2025 · Sep 25, 2025
diff --git a/README.md b/README.md
@@ -121,7 +121,7 @@ module "eks" {
   eks_managed_node_groups = {
     example = {
       # Starting on 1.30, AL2023 is the default AMI type for EKS managed node groups
-      ami_type       = "AL2023_x86_64_STANDARD"
+      ami_type       = "AL2023_X86_64_STANDARD"
       instance_types = ["m5.xlarge"]
 
       min_size     = 2
@@ -292,7 +292,7 @@ module "eks" {
     example = {
       # The EKS AL2023 NVIDIA AMI provides all of the necessary components
       # for accelerated workloads w/ EFA
-      ami_type       = "AL2023_x86_64_NVIDIA"
+      ami_type       = "AL2023_X86_64_NVIDIA"
       instance_types = ["p5.48xlarge"]
 
       # Exposes all EFA interfaces on the launch template created by the node group(s)

diff --git a/docs/UPGRADE-17.0.md b/docs/UPGRADE-17.0.md
@@ -43,7 +43,7 @@ Terraform will perform the following actions:
   - resource "random_pet" "node_groups" {
       - id        = "sincere-squid" -> null
       - keepers   = {
-          - "ami_type"                  = "AL2_x86_64"
+          - "ami_type"                  = "AL2_X86_64"
           - "capacity_type"             = "SPOT"
           - "disk_size"                 = "50"
           - "iam_role_arn"              = "arn:aws:iam::123456789123:role/test-eks-mwIwsvui20210527220853611600000009"

diff --git a/docs/UPGRADE-18.0.md b/docs/UPGRADE-18.0.md
@@ -353,7 +353,7 @@ module "eks" {
 
   # Managed Node Groups
   node_groups_defaults = {
-    ami_type  = "AL2_x86_64"
+    ami_type  = "AL2_X86_64"
     disk_size = 50
   }
 
@@ -456,7 +456,7 @@ module "cluster_after" {
   subnet_ids = module.vpc.private_subnets
 
   eks_managed_node_group_defaults = {
-    ami_type  = "AL2_x86_64"
+    ami_type  = "AL2_X86_64"
     disk_size = 50
   }
 
@@ -593,7 +593,7 @@ module "cluster_after" {
 -  # Managed Node Groups
 -  node_groups_defaults = {
 +  eks_managed_node_group_defaults = {
-     ami_type  = "AL2_x86_64"
+     ami_type  = "AL2_X86_64"
      disk_size = 50
    }
 

diff --git a/docs/UPGRADE-19.0.md b/docs/UPGRADE-19.0.md
@@ -277,7 +277,7 @@ EKS managed node groups on `v18.x` by default create a security group that does
 
   # EKS Managed Node Group(s)
   eks_managed_node_group_defaults = {
-    ami_type       = "AL2_x86_64"
+    ami_type       = "AL2_X86_64"
     instance_types = ["m6i.large", "m5.large", "m5n.large", "m5zn.large"]
 
     attach_cluster_primary_security_group = true

diff --git a/docs/UPGRADE-21.0.md b/docs/UPGRADE-21.0.md
@@ -13,14 +13,14 @@ If you find a bug, please open an issue with supporting configuration to reprodu
 - When enabling `enable_efa_support` or creating placement groups within a node group, users must now specify the correct `subnet_ids`; the module no longer tries to automatically select a suitable subnet.
 - EKS managed node group:
     - IMDS now default to a hop limit of 1 (previously was 2)
-    - `ami_type` now defaults to `AL2023_x86_64_STANDARD`
+    - `ami_type` now defaults to `AL2023_X86_64_STANDARD`
     - `enable_monitoring` is now set to `false` by default
     - `enable_efa_only` is now set to `true` by default
     - `use_latest_ami_release_version` is now set to `true` by default
     - Support for autoscaling group schedules has been removed
 - Self-managed node group:
     - IMDS now default to a hop limit of 1 (previously was 2)
-    - `ami_type` now defaults to `AL2023_x86_64_STANDARD`
+    - `ami_type` now defaults to `AL2023_X86_64_STANDARD`
     - `enable_monitoring` is now set to `false` by default
     - `enable_efa_only` is now set to `true` by default
     - Support for autoscaling group schedules has been removed
@@ -221,7 +221,7 @@ module "eks" {
 
   eks_managed_node_groups = {
     efa = {
-      ami_type       = "AL2023_x86_64_NVIDIA"
+      ami_type       = "AL2023_X86_64_NVIDIA"
       instance_types = ["p5e.48xlarge"]
 
       enable_efa_support = true
@@ -274,7 +274,7 @@ module "eks" {
 
   eks_managed_node_groups = {
     efa = {
-      ami_type       = "AL2023_x86_64_NVIDIA"
+      ami_type       = "AL2023_X86_64_NVIDIA"
       instance_types = ["p5e.48xlarge"]
 
       iam_role_additional_policies = {

diff --git a/docs/compute_resources.md b/docs/compute_resources.md
@@ -30,7 +30,7 @@ Refer to the [EKS Managed Node Group documentation](https://docs.aws.amazon.com/
     bottlerocket_default = {
       use_custom_launch_template = false
 
-      ami_type = "BOTTLEROCKET_x86_64"
+      ami_type = "BOTTLEROCKET_X86_64"
     }
   }
 ```
@@ -40,7 +40,7 @@ Refer to the [EKS Managed Node Group documentation](https://docs.aws.amazon.com/
 ```hcl
   eks_managed_node_groups = {
     bottlerocket_prepend_userdata = {
-      ami_type = "BOTTLEROCKET_x86_64"
+      ami_type = "BOTTLEROCKET_X86_64"
 
       bootstrap_extra_args = <<-EOT
         # extra args added
@@ -57,7 +57,7 @@ Refer to the [EKS Managed Node Group documentation](https://docs.aws.amazon.com/
   eks_managed_node_groups = {
     custom_ami = {
       ami_id   = "ami-0caf35bc73450c396"
-      ami_type = "AL2023_x86_64_STANDARD"
+      ami_type = "AL2023_X86_64_STANDARD"
 
       # By default, EKS managed node groups will not append bootstrap script;
       # this adds it back in using the default template provided by the module
@@ -94,7 +94,7 @@ Refer to the [EKS Managed Node Group documentation](https://docs.aws.amazon.com/
   eks_managed_node_groups = {
     bottlerocket_custom_ami = {
       ami_id   = "ami-0ff61e0bcfc81dc94"
-      ami_type = "BOTTLEROCKET_x86_64"
+      ami_type = "BOTTLEROCKET_X86_64"
 
       # use module user data template to bootstrap
       enable_bootstrap_user_data = true
@@ -141,7 +141,7 @@ Refer to the [Self Managed Node Group documentation](https://docs.aws.amazon.com
   self_managed_node_groups = {
     bottlerocket = {
       ami_id   = data.aws_ami.bottlerocket_ami.id
-      ami_type = "BOTTLEROCKET_x86_64"
+      ami_type = "BOTTLEROCKET_X86_64"
     }
   }
 ```

diff --git a/examples/eks-managed-node-group/eks-al2023.tf b/examples/eks-managed-node-group/eks-al2023.tf
@@ -24,7 +24,7 @@ module "eks_al2023" {
     example = {
       # Starting on 1.30, AL2023 is the default AMI type for EKS managed node groups
       instance_types = ["m6i.large"]
-      ami_type       = "AL2023_x86_64_STANDARD"
+      ami_type       = "AL2023_X86_64_STANDARD"
 
       min_size = 2
       max_size = 5

diff --git a/examples/eks-managed-node-group/eks-bottlerocket.tf b/examples/eks-managed-node-group/eks-bottlerocket.tf
@@ -22,7 +22,7 @@ module "eks_bottlerocket" {
 
   eks_managed_node_groups = {
     example = {
-      ami_type       = "BOTTLEROCKET_x86_64"
+      ami_type       = "BOTTLEROCKET_X86_64"
       instance_types = ["m6i.large"]
 
       min_size = 2

diff --git a/examples/karpenter/main.tf b/examples/karpenter/main.tf
@@ -79,7 +79,7 @@ module "eks" {
 
   eks_managed_node_groups = {
     karpenter = {
-      ami_type       = "BOTTLEROCKET_x86_64"
+      ami_type       = "BOTTLEROCKET_X86_64"
       instance_types = ["m5.large"]
 
       min_size     = 2

diff --git a/examples/self-managed-node-group/eks-al2023.tf b/examples/self-managed-node-group/eks-al2023.tf
@@ -22,7 +22,7 @@ module "eks_al2023" {
 
   self_managed_node_groups = {
     example = {
-      ami_type      = "AL2023_x86_64_STANDARD"
+      ami_type      = "AL2023_X86_64_STANDARD"
       instance_type = "m6i.large"
 
       min_size = 2

diff --git a/examples/self-managed-node-group/eks-bottlerocket.tf b/examples/self-managed-node-group/eks-bottlerocket.tf
@@ -22,7 +22,7 @@ module "eks_bottlerocket" {
 
   self_managed_node_groups = {
     example = {
-      ami_type      = "BOTTLEROCKET_x86_64"
+      ami_type      = "BOTTLEROCKET_X86_64"
       instance_type = "m6i.large"
 
       min_size = 2

diff --git a/modules/_user_data/README.md b/modules/_user_data/README.md
@@ -37,7 +37,7 @@ No modules.
 | Name | Description | Type | Default | Required |
 |------|-------------|------|---------|:--------:|
 | <a name="input_additional_cluster_dns_ips"></a> [additional\_cluster\_dns\_ips](#input\_additional\_cluster\_dns\_ips) | Additional DNS IP addresses to use for the cluster. Only used when `ami_type` = `BOTTLEROCKET_*` | `list(string)` | `[]` | no |
-| <a name="input_ami_type"></a> [ami\_type](#input\_ami\_type) | Type of Amazon Machine Image (AMI) associated with the EKS Node Group. See the [AWS documentation](https://docs.aws.amazon.com/eks/latest/APIReference/API_Nodegroup.html#AmazonEKS-Type-Nodegroup-amiType) for valid values | `string` | `"AL2023_x86_64_STANDARD"` | no |
+| <a name="input_ami_type"></a> [ami\_type](#input\_ami\_type) | Type of Amazon Machine Image (AMI) associated with the EKS Node Group. See the [AWS documentation](https://docs.aws.amazon.com/eks/latest/APIReference/API_Nodegroup.html#AmazonEKS-Type-Nodegroup-amiType) for valid values | `string` | `"AL2023_X86_64_STANDARD"` | no |
 | <a name="input_bootstrap_extra_args"></a> [bootstrap\_extra\_args](#input\_bootstrap\_extra\_args) | Additional arguments passed to the bootstrap script. When `ami_type` = `BOTTLEROCKET_*`; these are additional [settings](https://github.com/bottlerocket-os/bottlerocket#settings) that are provided to the Bottlerocket user data | `string` | `""` | no |
 | <a name="input_cloudinit_post_nodeadm"></a> [cloudinit\_post\_nodeadm](#input\_cloudinit\_post\_nodeadm) | Array of cloud-init document parts that are created after the nodeadm document part | <pre>list(object({<br/>    content      = string<br/>    content_type = optional(string)<br/>    filename     = optional(string)<br/>    merge_type   = optional(string)<br/>  }))</pre> | `[]` | no |
 | <a name="input_cloudinit_pre_nodeadm"></a> [cloudinit\_pre\_nodeadm](#input\_cloudinit\_pre\_nodeadm) | Array of cloud-init document parts that are created before the nodeadm document part | <pre>list(object({<br/>    content      = string<br/>    content_type = optional(string)<br/>    filename     = optional(string)<br/>    merge_type   = optional(string)<br/>  }))</pre> | `[]` | no |

diff --git a/modules/_user_data/main.tf b/modules/_user_data/main.tf
@@ -14,36 +14,37 @@ resource "null_resource" "validate_cluster_service_cidr" {
 }
 
 locals {
-  is_al2    = startswith(var.ami_type, "AL2_")
-  is_al2023 = startswith(var.ami_type, "AL2023_")
+  ami_type  = upper(var.ami_type)
+  is_al2    = startswith(local.ami_type, "AL2_")
+  is_al2023 = startswith(local.ami_type, "AL2023_")
 
   # Converts AMI type into user data template path
   ami_type_to_user_data_path = {
     AL2_ARM_64     = "${path.module}/../../templates/al2_user_data.tpl"
-    AL2_x86_64     = "${path.module}/../../templates/al2_user_data.tpl"
-    AL2_x86_64_GPU = "${path.module}/../../templates/al2_user_data.tpl"
+    AL2_X86_64     = "${path.module}/../../templates/al2_user_data.tpl"
+    AL2_X86_64_GPU = "${path.module}/../../templates/al2_user_data.tpl"
 
-    AL2023_x86_64_STANDARD = "${path.module}/../../templates/al2023_user_data.tpl"
+    AL2023_X86_64_STANDARD = "${path.module}/../../templates/al2023_user_data.tpl"
     AL2023_ARM_64_STANDARD = "${path.module}/../../templates/al2023_user_data.tpl"
-    AL2023_x86_64_NEURON   = "${path.module}/../../templates/al2023_user_data.tpl"
-    AL2023_x86_64_NVIDIA   = "${path.module}/../../templates/al2023_user_data.tpl"
+    AL2023_X86_64_NEURON   = "${path.module}/../../templates/al2023_user_data.tpl"
+    AL2023_X86_64_NVIDIA   = "${path.module}/../../templates/al2023_user_data.tpl"
     AL2023_ARM_64_NVIDIA   = "${path.module}/../../templates/al2023_user_data.tpl"
 
     BOTTLEROCKET_ARM_64        = "${path.module}/../../templates/bottlerocket_user_data.tpl"
-    BOTTLEROCKET_x86_64        = "${path.module}/../../templates/bottlerocket_user_data.tpl"
+    BOTTLEROCKET_X86_64        = "${path.module}/../../templates/bottlerocket_user_data.tpl"
     BOTTLEROCKET_ARM_64_FIPS   = "${path.module}/../../templates/bottlerocket_user_data.tpl"
-    BOTTLEROCKET_x86_64_FIPS   = "${path.module}/../../templates/bottlerocket_user_data.tpl"
+    BOTTLEROCKET_X86_64_FIPS   = "${path.module}/../../templates/bottlerocket_user_data.tpl"
     BOTTLEROCKET_ARM_64_NVIDIA = "${path.module}/../../templates/bottlerocket_user_data.tpl"
-    BOTTLEROCKET_x86_64_NVIDIA = "${path.module}/../../templates/bottlerocket_user_data.tpl"
+    BOTTLEROCKET_X86_64_NVIDIA = "${path.module}/../../templates/bottlerocket_user_data.tpl"
 
-    WINDOWS_CORE_2019_x86_64 = "${path.module}/../../templates/windows_user_data.tpl"
-    WINDOWS_FULL_2019_x86_64 = "${path.module}/../../templates/windows_user_data.tpl"
-    WINDOWS_CORE_2022_x86_64 = "${path.module}/../../templates/windows_user_data.tpl"
-    WINDOWS_FULL_2022_x86_64 = "${path.module}/../../templates/windows_user_data.tpl"
+    WINDOWS_CORE_2019_X86_64 = "${path.module}/../../templates/windows_user_data.tpl"
+    WINDOWS_FULL_2019_X86_64 = "${path.module}/../../templates/windows_user_data.tpl"
+    WINDOWS_CORE_2022_X86_64 = "${path.module}/../../templates/windows_user_data.tpl"
+    WINDOWS_FULL_2022_X86_64 = "${path.module}/../../templates/windows_user_data.tpl"
 
     CUSTOM = var.user_data_template_path
   }
-  user_data_path = coalesce(var.user_data_template_path, local.ami_type_to_user_data_path[var.ami_type])
+  user_data_path = coalesce(var.user_data_template_path, local.ami_type_to_user_data_path[local.ami_type])
 
   cluster_dns_ips = flatten(concat([try(cidrhost(var.cluster_service_cidr, 10), "")], var.additional_cluster_dns_ips))
 

diff --git a/modules/_user_data/variables.tf b/modules/_user_data/variables.tf
@@ -8,7 +8,7 @@ variable "create" {
 variable "ami_type" {
   description = "Type of Amazon Machine Image (AMI) associated with the EKS Node Group. See the [AWS documentation](https://docs.aws.amazon.com/eks/latest/APIReference/API_Nodegroup.html#AmazonEKS-Type-Nodegroup-amiType) for valid values"
   type        = string
-  default     = "AL2023_x86_64_STANDARD"
+  default     = "AL2023_X86_64_STANDARD"
   nullable    = false
 }
 

diff --git a/modules/eks-managed-node-group/README.md b/modules/eks-managed-node-group/README.md
@@ -108,7 +108,7 @@ module "eks_managed_node_group" {
 | <a name="input_account_id"></a> [account\_id](#input\_account\_id) | The AWS account ID - pass through value to reduce number of GET requests from data sources | `string` | `""` | no |
 | <a name="input_ami_id"></a> [ami\_id](#input\_ami\_id) | The AMI from which to launch the instance. If not supplied, EKS will use its own default image | `string` | `""` | no |
 | <a name="input_ami_release_version"></a> [ami\_release\_version](#input\_ami\_release\_version) | The AMI version. Defaults to latest AMI release version for the given Kubernetes version and AMI type | `string` | `null` | no |
-| <a name="input_ami_type"></a> [ami\_type](#input\_ami\_type) | Type of Amazon Machine Image (AMI) associated with the EKS Node Group. See the [AWS documentation](https://docs.aws.amazon.com/eks/latest/APIReference/API_Nodegroup.html#AmazonEKS-Type-Nodegroup-amiType) for valid values | `string` | `"AL2023_x86_64_STANDARD"` | no |
+| <a name="input_ami_type"></a> [ami\_type](#input\_ami\_type) | Type of Amazon Machine Image (AMI) associated with the EKS Node Group. See the [AWS documentation](https://docs.aws.amazon.com/eks/latest/APIReference/API_Nodegroup.html#AmazonEKS-Type-Nodegroup-amiType) for valid values | `string` | `"AL2023_X86_64_STANDARD"` | no |
 | <a name="input_block_device_mappings"></a> [block\_device\_mappings](#input\_block\_device\_mappings) | Specify volumes to attach to the instance besides the volumes specified by the AMI | <pre>map(object({<br/>    device_name = optional(string)<br/>    ebs = optional(object({<br/>      delete_on_termination      = optional(bool)<br/>      encrypted                  = optional(bool)<br/>      iops                       = optional(number)<br/>      kms_key_id                 = optional(string)<br/>      snapshot_id                = optional(string)<br/>      throughput                 = optional(number)<br/>      volume_initialization_rate = optional(number)<br/>      volume_size                = optional(number)<br/>      volume_type                = optional(string)<br/>    }))<br/>    no_device    = optional(string)<br/>    virtual_name = optional(string)<br/>  }))</pre> | `null` | no |
 | <a name="input_bootstrap_extra_args"></a> [bootstrap\_extra\_args](#input\_bootstrap\_extra\_args) | Additional arguments passed to the bootstrap script. When `ami_type` = `BOTTLEROCKET_*`; these are additional [settings](https://github.com/bottlerocket-os/bottlerocket#settings) that are provided to the Bottlerocket user data | `string` | `null` | no |
 | <a name="input_capacity_reservation_specification"></a> [capacity\_reservation\_specification](#input\_capacity\_reservation\_specification) | Targeting for EC2 capacity reservations | <pre>object({<br/>    capacity_reservation_preference = optional(string)<br/>    capacity_reservation_target = optional(object({<br/>      capacity_reservation_id                 = optional(string)<br/>      capacity_reservation_resource_group_arn = optional(string)<br/>    }))<br/>  })</pre> | `null` | no |