feat: add support for node upgrade surge (#13)

main.tf

@@ -46,4 +46,6 @@ module "default_workers" {
   min_nodes              = var.min_nodes
   max_nodes              = var.max_nodes
   init_nodes             = var.init_nodes
+  max_surge              = var.max_surge
+  max_unavailable        = var.max_unavailable
 }

modules/gke-cluster/main.tf

@@ -66,7 +66,7 @@ resource "google_container_cluster" "k8s-cluster" {
     }
     istio_config {
       disabled = var.disable_istio
-      auth = var.istio_config_auth
+      auth     = var.istio_config_auth
     }
   }
 }

modules/gke-workers/main.tf

@@ -47,5 +47,10 @@ resource "google_container_node_pool" "k8s-worker-pool" {
     max_node_count = var.max_nodes
     min_node_count = var.min_nodes
   }
+
+  upgrade_settings {
+    max_surge       = var.max_surge
+    max_unavailable = var.max_unavailable
+  }
 }
 

modules/gke-workers/variables.tf

@@ -48,3 +48,8 @@ variable "max_nodes" {
 variable "init_nodes" {
 }
 
+variable "max_surge" {
+}
+
+variable "max_unavailable" {
+}

variables.tf

@@ -78,6 +78,14 @@ variable "max_nodes" {
   description = "Max number of workers"
 }
 
+variable "max_surge" {
+  default = 1
+}
+
+variable "max_unavailable" {
+  default = 0
+}
+
 variable "daily_maintenance" {
   default = "02:00"
 }