eks-enableautoscaling.ts

enableAutoscaling(cluster: eks.Cluster, ng: eks.Nodegroup, version: string = "v1.17.3") {
    const autoscalerStmt = new iam.PolicyStatement();
    autoscalerStmt.addResources("*");
    autoscalerStmt.addActions(
      "autoscaling:DescribeAutoScalingGroups",
      "autoscaling:DescribeAutoScalingInstances",
      "autoscaling:DescribeLaunchConfigurations",
      "autoscaling:DescribeTags",
      "autoscaling:SetDesiredCapacity",
      "autoscaling:TerminateInstanceInAutoScalingGroup",
      "ec2:DescribeLaunchTemplateVersions"
    );
    const autoscalerPolicy = new iam.Policy(this, "cluster-autoscaler-policy", {
      policyName: "ClusterAutoscalerPolicy",
      statements: [autoscalerStmt],
    });
    autoscalerPolicy.attachToRole(ng.role);

    const clusterName = new CfnJson(this, "clusterName", {
      value: cluster.clusterName,
    });
    cdk.Tag.add(ng, `k8s.io/cluster-autoscaler/${clusterName}`, "owned", { applyToLaunchedInstances: true });
    cdk.Tag.add(ng, "k8s.io/cluster-autoscaler/enabled", "true", { applyToLaunchedInstances: true });

    new eks.KubernetesManifest(this, "cluster-autoscaler", {
      cluster,
      manifest: [  {
          apiVersion: "v1",
          kind: "ServiceAccount", 
          ... }], // full code is available here: https://gist.github.com/esys/bb7bbeb44565f85f48b3112a8d73a092
    });
}