node_groups.tf

resource "aws_eks_node_group" "node_group" {
  cluster_name    = aws_eks_cluster.main.name
  node_group_name = "main-node-group"
  node_role_arn   = aws_iam_role.node_group.arn
  subnet_ids      = var.subnet_ids
  scaling_config {
    desired_size = 1
    max_size     = 1
    min_size     = 1
  }
}

resource "aws_iam_role" "node_group" {
  name = "eks-node-group-role"

  assume_role_policy = jsonencode({
    Statement = [{
      Action = "sts:AssumeRole"
      Effect = "Allow"
      Principal = {
        Service = "ec2.amazonaws.com"
      }
    }]
    Version = "2012-10-17"
  })
}

resource "aws_iam_role_policy_attachment" "node_group_node_policy" {
  policy_arn = "arn:aws:iam::aws:policy/AmazonEKSWorkerNodePolicy"
  role       = aws_iam_role.node_group.name
}

resource "aws_iam_role_policy_attachment" "node_group_cni_policy" {
  policy_arn = "arn:aws:iam::aws:policy/AmazonEKS_CNI_Policy"
  role       = aws_iam_role.node_group.name
}

resource "aws_iam_role_policy_attachment" "node_group_ec2_container_registry_policy" {
  policy_arn = "arn:aws:iam::aws:policy/AmazonEC2ContainerRegistryReadOnly"
  role       = aws_iam_role.node_group.name
}