Merge branch '10-add-node-autoscaling' into 'master'

Add node autoscaling

Closes #10

See merge request !12

main.tf

@@ -97,8 +97,9 @@ resource "google_container_node_pool" "cluster-pool-1" {
   name    = "pool-1"
   cluster = google_container_cluster.cluster.name
 
+  # Not used if autoscaling specified.
   # Note that this is multiplied by the number of zones in the region.
-  node_count = 1
+  node_count = var.autoscaling != null ? null : var.node_count
 
   management {
     auto_repair  = true
@@ -124,6 +125,14 @@ resource "google_container_node_pool" "cluster-pool-1" {
       "https://www.googleapis.com/auth/monitoring",
     ]
   }
+
+  dynamic "autoscaling" {
+    for_each = var.autoscaling != null ? [var.autoscaling] : []
+    content {
+      min_node_count = autoscaling.value.min_node_count
+      max_node_count = autoscaling.value.max_node_count
+    }
+  }
 }
 
 # kubeconfig-style configuration
@@ -138,4 +147,3 @@ data "template_file" "kubeconfig" {
     endpoint       = google_container_cluster.cluster.endpoint
   }
 }
-

variables.tf

@@ -70,3 +70,19 @@ variable "disk_type" {
   description = "Type of the disk attached to each node (e.g. 'pd-standard' or 'pd-ssd')"
 }
 
+variable "node_count" {
+  default     = 1
+  description = "Number of nodes per zone"
+}
+
+variable "autoscaling" {
+  default     = null
+  description = <<EOI
+Minimum and maximum nodes per zone when autoscaling. For example: {min_node_count = 1, max_node_count = 3}
+EOI
+
+  type = object({
+    min_node_count = number
+    max_node_count = number
+  })
+}