Access Entry for Windows managed node groups

[rwe-dtroup]

Description

When creating a Windows node group using the eks-managed-node-group sub module when Access Management control is set to API or API_AND_CONFIG_MAP, the access entry is created as EC2_LINUX.

This is true when using a custom launch template and ami_id.

AWS have confirmed this is the case and the entry for the managed node groups access entry would need to be configured manually/by code and not allow EKS to create this entry automatically.

• ✋ I have searched the open/closed issues and my issue is not listed.

⚠️ Note

Before you submit an issue, please perform the following first:

1. Remove the local .terraform directory (! ONLY if state is stored remotely, which hopefully you are following that best practice!): rm -rf .terraform/
2. Re-initialize the project root to pull down modules: terraform init
3. Re-attempt your terraform plan or apply and check if the issue still persists

Versions

• Module version [Required]: 20.8.4

• Terraform version: 1.7.5

• Provider version(s):

provider registry.terraform.io/hashicorp/aws v5.42.0
provider registry.terraform.io/hashicorp/cloudinit v2.3.3
provider registry.terraform.io/hashicorp/kubernetes v2.20.0
provider registry.terraform.io/hashicorp/null v3.2.2
provider registry.terraform.io/hashicorp/template v2.2.0
provider registry.terraform.io/hashicorp/time v0.9.2
provider registry.terraform.io/hashicorp/tls v4.0.5

Reproduction Code [Required]

module "eks" {

source = "../.."
....

eks_managed_node_groups = {
windows_2022 = {
      name           = "windows-2022"
      platform       = "windows"
      ami_id         = ami-12345678910111213
      instance_types = ["m6i.large"]
      scaling_config = {
        min_size     = 1
        max_size     = 1
        desired_size = 1
      }
      taints = {
        windows-taint = {
          key    = "windows-node"
          value  = "true"
          effect = "NO_SCHEDULE"
        }
      }
      block_device_mappings = {
        sda1 = {
          device_name = "/dev/sda1",
          ebs         = { volume_size = 100 }
        }
      }
    }
....
}

Steps to reproduce the behavior:

Terraform apply with the above Windows eks managed node group

Expected behavior

An IAM access entries with type EC2_WINDOWS

Actual behavior

An IAM access entries with type EC2_LINUX

Terminal Output Screenshot(s)

Additional context

This is a know issue when using custom templates, as confirmed by AWS support.
Adding an access entry object as part of the base module may fix this issue

[bryantbiggs]

I think your configuration is incorrect. I can see at least two errors in what you have provided:

1. You are specifying an ami_id which means MNG will not automatically inject the bootstrap user data - you would need to enable this with enable_bootstrap_user_data = true. However, I would recommend not specifying the AMI ID unless you absolutely need a custom AMI
2. You have not provided the AMI type - this is related to 1. By not specifying the AMI type, MNG does not know what type of nodegroup you are creating and I suspect its defaulting to thinking its Linux based. See below for an example that I believe should work:

module "eks" {
  source  = "terraform-aws-modules/eks/aws"
  version = "~> 20.8"

  # Add in other required arguments and values ...

  eks_managed_node_groups = {
    windows_2022 = {
      platform = "windows"
      ami_type = "WINDOWS_CORE_2022_x86_64"

      instance_types = ["m6i.large"]

      scaling_config = {
        min_size     = 1
        max_size     = 1
        desired_size = 1
      }

      taints = {
        windows-taint = {
          key    = "windows-node"
          value  = "true"
          effect = "NO_SCHEDULE"
        }
      }

      block_device_mappings = {
        sda1 = {
          device_name = "/dev/sda1",
          ebs         = { volume_size = 100 }
        }
      }
    }
  }
}

[rwe-dtroup]

We have to set a specific AMI as only approved ami's can run in our environment

[bryantbiggs]

ok, if thats the case you would still need to set enable_bootstrap_user_data = true since MNG will not supply that. I will check on the access entry portion, thank you!

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