Configurable initial node count (#41)

node_pools.tf

@@ -30,7 +30,7 @@ resource "google_container_node_pool" "node_pool_mt_green" {
 
   # if we are 'regional' i.e. in 3 zones,
   # "1" here means "1 in each zone"
-  initial_node_count = var.zonal_cluster ? "3" : "1"
+  initial_node_count = var.green_mt_np_initial_node_count
 
   autoscaling {
     min_node_count = "0"
@@ -100,12 +100,6 @@ resource "google_container_node_pool" "node_pool_mt" {
 
   version = var.kube_version_gke
 
-  # We want the multi-tenant node pool to be completely replaced
-  # instead of rolling deployment.
-  # The master_version will ensure that the node pool is created then
-  # destroyed if there is an update.
-  name = "${var.deployment_id}-mt-${formatdate("MM-DD-hh-mm", timestamp())}"
-
   # this one can take a long time to delete or create
   timeouts {
     create = "30m"
@@ -123,7 +117,7 @@ resource "google_container_node_pool" "node_pool_mt" {
 
   # if we are 'regional' i.e. in 3 zones,
   # "1" here means "1 in each zone"
-  initial_node_count = var.zonal_cluster ? "3" : "1"
+  initial_node_count = var.blue_mt_np_initial_node_count
 
   autoscaling {
     min_node_count = "0"
@@ -207,7 +201,7 @@ resource "google_container_node_pool" "node_pool_dynamic_pods" {
 
   # if we are 'regional' i.e. in 3 zones,
   # "1" here means "1 in each zone"
-  initial_node_count = var.zonal_cluster ? "3" : "1"
+  initial_node_count = var.dynamic_np_initial_node_count
 
   autoscaling {
     min_node_count = "0"
@@ -275,7 +269,7 @@ resource "google_container_node_pool" "node_pool_platform" {
 
   # if we are 'regional' i.e. in 3 zones,
   # "1" here means "1 in each zone"
-  initial_node_count = var.zonal_cluster ? "3" : "1"
+  initial_node_count = var.blue_platform_np_initial_node_count
 
   autoscaling {
     min_node_count = "1"
@@ -338,7 +332,7 @@ resource "google_container_node_pool" "node_pool_platform_green" {
 
   # if we are 'regional' i.e. in 3 zones,
   # "1" here means "1 in each zone"
-  initial_node_count = var.zonal_cluster ? "3" : "1"
+  initial_node_count = var.green_platform_np_initial_node_count
 
   autoscaling {
     min_node_count = "1"

variables.tf

@@ -131,6 +131,12 @@ variable "enable_blue_platform_node_pool" {
   description = "Turn on the blue platform node pool"
 }
 
+variable "blue_platform_np_initial_node_count" {
+  type        = number
+  default     = 1
+  description = "Initial node count for the blue platform node pool"
+}
+
 variable "machine_type_platform_blue" {
   default     = "n1-standard-4"
   type        = string
@@ -163,6 +169,12 @@ variable "enable_green_platform_node_pool" {
   description = "Turn on the green platform node pool"
 }
 
+variable "green_platform_np_initial_node_count" {
+  type        = number
+  default     = 1
+  description = "Initial node count for the green platform node pool"
+}
+
 variable "machine_type_platform_green" {
   default     = "n1-standard-4"
   type        = string
@@ -196,6 +208,12 @@ variable "enable_blue_mt_node_pool" {
   description = "Turn on the blue multi-tenant node pool"
 }
 
+variable "blue_mt_np_initial_node_count" {
+  type        = number
+  default     = 1
+  description = "Initial node count for the blue multi-tenant node pool"
+}
+
 variable "machine_type_multi_tenant_blue" {
   default     = "n1-standard-4"
   description = "The GCP machine type for GKE worker nodes running multi-tenant workloads"
@@ -232,6 +250,12 @@ variable "enable_green_mt_node_pool" {
   description = "Turn on the green multi-tenant node pool"
 }
 
+variable "green_mt_np_initial_node_count" {
+  type        = number
+  default     = 1
+  description = "Initial node count for the green multi-tenant node pool"
+}
+
 variable "machine_type_multi_tenant_green" {
   default     = "n1-standard-4"
   description = "The GCP machine type for GKE worker nodes running multi-tenant workloads"
@@ -268,6 +292,12 @@ variable "create_dynamic_pods_nodepool" {
   description = "If true, creates a NodePool for the pods spun up using KubernetesPodsOperator or KubernetesExecutor"
 }
 
+variable "dynamic_np_initial_node_count" {
+  type        = number
+  default     = 1
+  description = "Initial node count for the dynamic node pool"
+}
+
 variable "disk_size_dynamic" {
   default     = 100
   type        = number