feat: Add stateful disk support (#90)

* Added: stateful configuration

* Added: var udpate

* Added: var udpate

* Updated: stateful_disk variable, autogen docs

Author: konstantin-recurly

autogen/main.tf.tmpl

@@ -79,6 +79,14 @@ resource "google_compute_region_instance_group_manager" "{{ module_name }}" {
     }
   }
 
+  dynamic "stateful_disk" {
+    for_each = var.stateful_disks
+    content {
+      device_name = stateful_disk.value.device_name
+      delete_rule = lookup(stateful_disk.value, "delete_rule", null)
+    }
+  }
+
   distribution_policy_zones = local.distribution_policy_zones
   dynamic "update_policy" {
     for_each = var.update_policy

autogen/variables.tf.tmpl

@@ -67,6 +67,18 @@ variable "distribution_policy_zones" {
   default     = []
 }
 
+#################
+# Stateful disks
+#################
+variable "stateful_disks" {
+  description = "Disks created on the instances that will be preserved on instance delete. https://cloud.google.com/compute/docs/instance-groups/configuring-stateful-disks-in-migs"
+  type = list(object({
+    device_name = string
+    delete_rule = string
+  }))
+  default = []
+}
+
 #################
 # Rolling Update
 #################

modules/mig/main.tf

@@ -63,17 +63,26 @@ resource "google_compute_region_instance_group_manager" "mig" {
     }
   }
 
+  dynamic "stateful_disk" {
+    for_each = var.stateful_disks
+    content {
+      device_name = stateful_disk.value.device_name
+      delete_rule = lookup(stateful_disk.value, "delete_rule", null)
+    }
+  }
+
   distribution_policy_zones = local.distribution_policy_zones
   dynamic "update_policy" {
     for_each = var.update_policy
     content {
-      max_surge_fixed         = lookup(update_policy.value, "max_surge_fixed", null)
-      max_surge_percent       = lookup(update_policy.value, "max_surge_percent", null)
-      max_unavailable_fixed   = lookup(update_policy.value, "max_unavailable_fixed", null)
-      max_unavailable_percent = lookup(update_policy.value, "max_unavailable_percent", null)
-      min_ready_sec           = lookup(update_policy.value, "min_ready_sec", null)
-      minimal_action          = update_policy.value.minimal_action
-      type                    = update_policy.value.type
+      instance_redistribution_type = lookup(update_policy.value, "instance_redistribution_type", null)
+      max_surge_fixed              = lookup(update_policy.value, "max_surge_fixed", null)
+      max_surge_percent            = lookup(update_policy.value, "max_surge_percent", null)
+      max_unavailable_fixed        = lookup(update_policy.value, "max_unavailable_fixed", null)
+      max_unavailable_percent      = lookup(update_policy.value, "max_unavailable_percent", null)
+      min_ready_sec                = lookup(update_policy.value, "min_ready_sec", null)
+      minimal_action               = update_policy.value.minimal_action
+      type                         = update_policy.value.type
     }
   }
 

modules/mig/variables.tf

@@ -52,20 +52,32 @@ variable "distribution_policy_zones" {
   default     = []
 }
 
+#################
+# Stateful disks
+#################
+variable "stateful_disks" {
+  description = "Disks created on the instances that will be preserved on instance delete. https://cloud.google.com/compute/docs/instance-groups/configuring-stateful-disks-in-migs"
+  type = list(object({
+    device_name = string
+    delete_rule = string
+  }))
+  default = []
+}
 #################
 # Rolling Update
 #################
 
 variable "update_policy" {
   description = "The rolling update policy. https://www.terraform.io/docs/providers/google/r/compute_region_instance_group_manager.html#rolling_update_policy"
   type = list(object({
-    max_surge_fixed         = number
-    max_surge_percent       = number
-    max_unavailable_fixed   = number
-    max_unavailable_percent = number
-    min_ready_sec           = number
-    minimal_action          = string
-    type                    = string
+    max_surge_fixed              = number
+    instance_redistribution_type = string
+    max_surge_percent            = number
+    max_unavailable_fixed        = number
+    max_unavailable_percent      = number
+    min_ready_sec                = number
+    minimal_action               = string
+    type                         = string
   }))
   default = []
 }