helm_release_cluster_autoscaler.tf

resource "helm_release" "cluster_autoscaler" {
  name       = "cluster-autoscaler"
  repository = "https://kubernetes.github.io/autoscaler"
  chart      = "cluster-autoscaler"
  namespace  = "cluster-autoscaler-namespace"
  version    = "9.37.0"

  set {
    name  = "image.tag"
    value = var.cluster_autoscaler_image_tag # Match the version with the chart version
  }

  values = [
    file("${path.module}/values/cluster-autoscaler-values.yaml")
  ]
  depends_on = [kubernetes_namespace.cluster-autoscaler-namespace]
}

resource "aws_iam_policy" "cluster_autoscaler_policy" {
  name        = "ClusterAutoscalerPolicy"
  description = "Allows Cluster Autoscaler to manage Auto Scaling groups"

  policy = jsonencode({
    Version = "2012-10-17"
    "Statement" : [
      {
        "Effect" : "Allow",
        "Action" : [
          "autoscaling:DescribeAutoScalingGroups",
          "autoscaling:DescribeAutoScalingInstances",
          "autoscaling:DescribeLaunchConfigurations",
          "autoscaling:DescribeScalingActivities",
          "ec2:DescribeImages",
          "ec2:DescribeInstanceTypes",
          "ec2:DescribeLaunchTemplateVersions",
          "ec2:GetInstanceTypesFromInstanceRequirements",
          "eks:DescribeNodegroup"
        ],
        "Resource" : ["*"]
      },
      {
        "Effect" : "Allow",
        "Action" : [
          "autoscaling:SetDesiredCapacity",
          "autoscaling:TerminateInstanceInAutoScalingGroup"
        ],
        "Resource" : ["*"]
      }
    ]
  })
}