Private subnet tags

 private_subnet_tags = {
   "kubernetes.io/cluster/${local.cluster_name}" = "shared"
   "kubernetes.io/role/internal-elb"             = 1
 }

 public_subnet_tags = {
   "kubernetes.io/cluster/${local.cluster_name}" = "shared"
   "kubernetes.io/role/elb"                      = 1
 }

Terraform VPC module: module.vpc, module.vpc.aws_internet_gateway, module.vpc.aws_nat_gateway, enable_nat_gateway, single_nat_gateway, enable_dns_hostnames