main.tf

data "aws_availability_zones" "available" {}

module "vpc" {
  source  = "terraform-aws-modules/vpc/aws"
  version = "3.14.0"

  name = "eks-vpc"
  cidr = var.vpc_cidr

  azs             = data.aws_availability_zones.available.names
  private_subnets = var.subnet_cidrs
  public_subnets  = [for i in range(3) : cidrsubnet(var.vpc_cidr, 8, i + 10)]

  enable_nat_gateway   = true
  single_nat_gateway   = true
  enable_dns_hostnames = true

  tags = {
    "kubernetes.io/cluster/${var.cluster_name}" = "shared"
  }

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

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

module "eks" {
  source  = "terraform-aws-modules/eks/aws"
  version = "18.26.3"

  cluster_name    = var.cluster_name
  cluster_version = var.cluster_version

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

  enable_irsa = true

  eks_managed_node_groups = {
    main = {
      desired_size = 2
      min_size     = 1
      max_size     = 3

      instance_types = var.instance_types
      capacity_type  = "ON_DEMAND"
    }
  }

  cluster_addons = {
    coredns = {
      most_recent       = true
      resolve_conflicts = "OVERWRITE"
    }
    kube-proxy = {
      most_recent       = true
      resolve_conflicts = "OVERWRITE"
    }
    vpc-cni = {
      most_recent       = true
      resolve_conflicts = "OVERWRITE"
    }
    aws-ebs-csi-driver = {
      most_recent       = true
      resolve_conflicts = "OVERWRITE"
    }
  }

  tags = {
    Environment = "dev"
    Terraform   = "true"
  }
}