eks-cluster.tf (version 18.26.6)

module "eks" {
 source  = "terraform-aws-modules/eks/aws"
 version = "18.26.6"

 cluster_name    = local.cluster_name
 cluster_version = "1.22"

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

 eks_managed_node_group_defaults = {
   ami_type = "AL2_x86_64"

   attach_cluster_primary_security_group = true

   # Disabling and using externally provided security groups
   create_security_group = false
 }

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

     instance_types = ["t3.small"]

     min_size     = 1
     max_size     = 3
     desired_size = 2

     pre_bootstrap_user_data = <<-EOT
     echo 'foo bar'
     EOT

     vpc_security_group_ids = [
       aws_security_group.node_group_one.id
     ]
   }

   two = {
     name = "node-group-2"

     instance_types = ["t3.medium"]

     min_size     = 1
     max_size     = 2
     desired_size = 1

     pre_bootstrap_user_data = <<-EOT
     echo 'foo bar'
     EOT

     vpc_security_group_ids = [
       aws_security_group.node_group_two.id
     ]
   }
 }
}

See also