modules/feature-node-autoscaler/main.tf

locals {
  karpenter_default_values_dot_yaml = <<VALUES
spec:
  serviceAccount:
    # -- Specifies if a ServiceAccount should be created.
    create: true
    # -- The name of the ServiceAccount to use.
    # If not set and create is true, a name is generated using the fullname template.
    name: "karpenter"
    # -- Additional annotations for the ServiceAccount.
    annotations:
        eks.amazonaws.com/role-arn: "${var.aws_iam_role_arn}"
  controller:
    resources:
      requests:
        cpu: 2
        memory: 2Gi
      limits:
        cpu: 2
        memory: 2Gi
  # -- Global Settings to configure Karpenter
  settings:
    # -- The maximum length of a batch window. The longer this is, the more pods we can consider for provisioning at one
    # time which usually results in fewer but larger nodes.
    batchMaxDuration: 10s
    # -- The maximum amount of time with no new ending pods that if exceeded ends the current batching window. If pods arrive
    # faster than this time, the batching window will be extended up to the maxDuration. If they arrive slower, the pods
    # will be batched separately.
    batchIdleDuration: 1s
    # -- Duration of assumed credentials in minutes. Default value is 15 minutes. Not used unless assumeRoleARN set.
    assumeRoleDuration: 15m
    # -- Cluster CA bundle for TLS configuration of provisioned nodes. If not set, this is taken from the controller's TLS configuration for the API server.
    clusterCABundle: "${var.kubernetes_cluster_ca_bundle}"
    # -- Cluster name.
    clusterName: "${var.kubernetes_cluster_name}"
    # -- Cluster endpoint. If not set, will be discovered during startup (EKS only)
    clusterEndpoint: "${var.kubernetes_cluster_endpoint}"
    # -- If true then assume we can't reach AWS services which don't have a VPC endpoint
    # This also has the effect of disabling look-ups to the AWS pricing endpoint
    isolatedVPC: false
    # -- The VM memory overhead as a percent that will be subtracted from the total memory for all instance types
    vmMemoryOverheadPercent: 0.075
    # -- interruptionQueue is disabled if not specified. Enabling interruption handling may
    # require additional permissions on the controller service account. Additional permissions are outlined in the docs.
    interruptionQueue: "${var.aws_interruption_queue}"
    # -- Reserved ENIs are not included in the calculations for max-pods or kube-reserved
    # This is most often used in the VPC CNI custom networking setup https://docs.aws.amazon.com/eks/latest/userguide/cni-custom-network.html
    reservedENIs: "0"
    # -- Feature Gate configuration values. Feature Gates will follow the same graduation process and requirements as feature gates
    # in Kubernetes. More information here https://kubernetes.io/docs/reference/command-line-tools-reference/feature-gates/#feature-gates-for-alpha-or-beta-features
    featureGates:
      # -- drift is in BETA and is enabled by default.
      # Setting drift to false disables the drift disruption method to watch for drift between currently deployed nodes
      # and the desired state of nodes set in nodepools and nodeclasses
      drift: true
      # -- spotToSpotConsolidation is disabled by default.
      # Setting this to true will enable spot replacement consolidation for both single and multi-node consolidation.
      spotToSpotConsolidation: false
VALUES
}

module "karpenter_helm_chart" {
  source  = "JetBrains/helm-charts/kubernetes"
  version = "0.3.0"
  charts = [{
    namespace         = var.helm_chart_namespace
    repository        = var.helm_chart_repository
    repository_config = var.helm_chart_repository_config
    app = {
      name             = var.helm_chart_name
      chart            = var.helm_chart_name
      version          = var.helm_chart_version
      create_namespace = var.helm_chart_create_namespace
    }
    values  = try(coalesce(var.helm_chart_values, local.karpenter_default_values_dot_yaml), local.karpenter_default_values_dot_yaml)
    params  = var.helm_chart_params
    secrets = var.helm_chart_secrets
  }]
}