feat(gke): Allow the ability to create a node pool with spot instances (#232)

Author: bkochendorfer

google_gke/cluster.tf

@@ -284,6 +284,9 @@ resource "google_container_node_pool" "pools" {
         sysctls = local.node_pools_sysctls[each.key]
       }
     }
+
+    spot = local.node_pools_spot_enabled[each.key]
+
     machine_type    = each.value.machine_type
     oauth_scopes    = local.node_pools_oauth_scopes[each.key]
     service_account = google_service_account.cluster_service_account.email

google_gke/locals.tf

@@ -53,6 +53,7 @@ locals {
   node_pools_guest_accelerator = { for node_pool in var.node_pools : node_pool.name => lookup(var.node_pools_guest_accelerator, node_pool.name, {}) }
   node_pools_tags              = { for node_pool in var.node_pools : node_pool.name => setunion(local.tags, lookup(var.node_pools_tags, node_pool.name, [])) }
   node_pools_taints            = { for node_pool in var.node_pools : node_pool.name => lookup(var.node_pools_taints, node_pool.name, []) }
+  node_pools_spot_enabled      = { for node_pool in var.node_pools : node_pool.name => lookup(var.node_pools_spot_enabled, node_pool.name, false) }
 
   # Google Group for RBAC
   cluster_authenticator_security_group = var.google_group_name == null ? [] : [{

google_gke/variables.tf

@@ -261,6 +261,14 @@ variable "node_pools_guest_accelerator" {
   }
 }
 
+variable "node_pools_spot_enabled" {
+  description = "Map containing node pools spot enabled. Each node pool's name is the key. See locals.tf for defaults."
+  type        = map(bool)
+  default = {
+    tf-default-node-pool = false
+  }
+}
+
 #
 # Monitoring
 #