Added support for cluster-autoscaler

data.tf

@@ -68,6 +68,24 @@ data "aws_iam_policy_document" "admin_assumerole" {
   }
 }
 
+data "aws_iam_policy_document" "workers_autoscaling" {
+  statement {
+    effect = "Allow"
+
+    actions = [
+      "autoscaling:DescribeAutoScalingGroups",
+      "autoscaling:DescribeAutoScalingInstances",
+      "autoscaling:DescribeTags",
+      "autoscaling:SetDesiredCapacity",
+      "autoscaling:TerminateInstanceInAutoScalingGroup",
+      "autoscaling:DescribeLaunchConfigurations",
+      "ec2:DescribeLaunchTemplateVersions",
+    ]
+
+    resources = ["*"]
+  }
+}
+
 data "template_file" "kubeconfig" {
   template = "${file("${path.module}/templates/kubeconfig.tpl")}"
 

workers.tf

@@ -28,6 +28,18 @@ resource "aws_autoscaling_group" "workers" {
     value               = "owned"
     propagate_at_launch = true
   }
+
+  tag {
+    key                 = "k8s.io/cluster-autoscaler/enabled"
+    value               = "true"
+    propagate_at_launch = true
+  }
+
+  tag {
+    key                 = "k8s.io/cluster-autoscaler/${var.cluster_name}"
+    value               = ""
+    propagate_at_launch = true
+  }
 }
 
 resource "aws_security_group" "workers" {
@@ -95,3 +107,13 @@ resource "aws_iam_instance_profile" "workers" {
   name = "${var.cluster_name}-eks-workers-instance-profile"
   role = "${aws_iam_role.workers.name}"
 }
+
+resource "aws_iam_policy" "workers_autoscaling" {
+  name   = "${var.cluster_name}-eks-kubernetes-workers-autoscaling"
+  policy = "${data.aws_iam_policy_document.workers_autoscaling.json}"
+}
+
+resource "aws_iam_role_policy_attachment" "workers_autoscaling" {
+  role       = "${aws_iam_role.workers.name}"
+  policy_arn = "${aws_iam_policy.workers_autoscaling.arn}"
+}