Add option to enable node autoscaling

Author: roivaz

hosted-cluster.tf

@@ -34,8 +34,9 @@ data "template_file" "helm_values" {
       "profile" : aws_iam_instance_profile.worker.name
       "instanceType" : var.workers_instance_type
       "securityGroup" : aws_security_group.worker.id
-      "number" : var.workers_number
     }
+    "worker_replicas" : var.worker_replicas
+    "worker_autoscaling" : var.worker_autoscaling
     "vault" : {
       "roleID" : vault_approle_auth_backend_role.this.role_id
       "secretID" : vault_approle_auth_backend_role_secret_id.this.secret_id

hosted-cluster/templates/nodepool.yaml

@@ -24,4 +24,10 @@ spec:
     type: AWS
   release:
     image: {{ .Values.releaseImage }}
-  replicas: {{ .Values.workers.number }}
+  {{- if .Values.worker_autoscaling.enabled }}
+  autoScaling:
+    min: {{ .Values.worker_autoscaling.min }}
+    max: {{ .Values.worker_autoscaling.max }}
+  {{- else }}
+  replicas: {{ .Values.worker_replicas }}
+  {{- end }}

hosted-cluster/values.yaml

@@ -16,6 +16,11 @@ sshKey: "hypershift-ssh-key"
 releaseImage: "quay.io/openshift-release-dev/ocp-release:4.14.10-multi-x86_64"
 fipsEnabled: false
 oauthEndpointCertificateSecretName: ""
+worker_replicas: 1
+worker_autoscaling:
+  enabled: false
+  max: 0
+  min: 0
 
 roles:
   controlPlaneOperator: ""

variables.tf

@@ -35,7 +35,20 @@ variable "workers_instance_type" {
   type    = string
   default = "t3a.2xlarge"
 }
-variable "workers_number" {
+variable "worker_autoscaling" {
+  type = object({
+    min     = number
+    max     = number
+    enabled = bool
+  })
+  default = {
+    min     = 0
+    max     = 0
+    enabled = false
+  }
+}
+
+variable "worker_replicas" {
   type    = number
   default = 1
 }