I want to bootstrap my EKS nodes with adding some custom configurations by using the user_data feature.

I have a fairly simple configuration that creates my cluster and a managed node group. See below.

Is there a simple way to add a custom user_data to the node group’s launch template?

module "eks" {
    source  = "terraform-aws-modules/eks/aws"

    cluster_name    = local.cluster_name
    cluster_version = "1.31"

    enable_cluster_creator_admin_permissions = true
    cluster_endpoint_public_access           = true
    cluster_endpoint_public_access_cidrs     = var.cluster_public_access_cidrs

    cluster_addons = {
        aws-ebs-csi-driver = {
            most_recent = true
            service_account_role_arn = module.ebs_csi_irsa_role.iam_role_arn
        }
    }

    vpc_id     = module.vpc.vpc_id
    subnet_ids = module.vpc.private_subnets

    eks_managed_node_group_defaults = {
        ami_type = "AL2_x86_64"
        iam_role_additional_policies = {
            AmazonEBSCSIDriverPolicy = "arn:aws:iam::aws:policy/service-role/AmazonEBSCSIDriverPolicy"
        }
    }

    eks_managed_node_groups = {
        one = {
            name = "node-group-1"

            instance_types = ["t3.small"]

            min_size     = 1
            max_size     = 3
            desired_size = 1
        }
    }
}