feat: autoscaler supporting stateful ips

autogen/main.tf.tmpl

@@ -91,6 +91,22 @@ resource "google_compute_region_instance_group_manager" "{{ module_name }}" {
     }
   }
 
+  dynamic "stateful_internal_ip" {
+    for_each = var.stateful_internal_ips
+    content {
+      network_interface_name = stateful_internal_ip.value.network_interface_name
+      delete_rule            = lookup(stateful_internal_ip.value, "delete_rule", null)
+    }
+  }
+
+  dynamic "stateful_external_ip" {
+    for_each = var.stateful_external_ips
+    content {
+      network_interface_name = stateful_external_ip.value.network_interface_name
+      delete_rule            = lookup(stateful_external_ip.value, "delete_rule", null)
+    }
+  }
+
   distribution_policy_zones = local.distribution_policy_zones
   dynamic "update_policy" {
     for_each = var.update_policy

autogen/variables.tf.tmpl

@@ -92,6 +92,27 @@ variable "stateful_disks" {
   default = []
 }
 
+#################
+# Stateful IPs
+#################
+variable "stateful_internal_ips" {
+  description = "Internal IPs created on the instances that will be preserved on instance delete. https://cloud.google.com/compute/docs/instance-groups/configuring-stateful-ip-addresses-in-migs"
+  type = list(object({
+    network_interface_name = string
+    delete_rule            = string
+  }))
+  default = []
+}
+
+variable "stateful_external_ips" {
+  description = "External IPs created on the instances that will be preserved on instance delete. https://cloud.google.com/compute/docs/instance-groups/configuring-stateful-ip-addresses-in-migs"
+  type = list(object({
+    network_interface_name = string
+    delete_rule            = string
+  }))
+  default = []
+}
+
 #################
 # Rolling Update
 #################

examples/mig/stateful/README.md

@@ -0,0 +1,24 @@
+# mig-simple
+
+This is a simple, minimal example of how to use the MIG module to create a
+managed instance group.
+
+<!-- BEGINNING OF PRE-COMMIT-TERRAFORM DOCS HOOK -->
+## Inputs
+
+| Name | Description | Type | Default | Required |
+|------|-------------|------|---------|:--------:|
+| project\_id | The GCP project to use for integration tests | `string` | n/a | yes |
+| region | The GCP region to create and test resources in | `string` | `"us-central1"` | no |
+| service\_account | Service account to attach to the instance. See https://www.terraform.io/docs/providers/google/r/compute_instance_template#service_account. | <pre>object({<br>    email  = string<br>    scopes = set(string)<br>  })</pre> | `null` | no |
+| subnetwork | The subnetwork to host the compute instances in | `any` | n/a | yes |
+| target\_size | The target number of running instances for this managed instance group. This value should always be explicitly set unless this resource is attached to an autoscaler, in which case it should never be set. | `any` | n/a | yes |
+
+## Outputs
+
+| Name | Description |
+|------|-------------|
+| region | The GCP region to create and test resources in |
+| self\_link | Self-link of the managed instance group |
+
+<!-- END OF PRE-COMMIT-TERRAFORM DOCS HOOK -->

examples/mig/stateful/main.tf

@@ -0,0 +1,79 @@
+/**
+ * Copyright 2018 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+provider "google" {
+  project = var.project_id
+  region  = var.region
+}
+
+provider "google-beta" {
+  project = var.project_id
+  region  = var.region
+}
+
+resource "random_string" "suffix" {
+  length  = 4
+  special = "false"
+  upper   = "false"
+}
+
+/** Network **/
+
+resource "google_compute_network" "main" {
+  project                 = var.project_id
+  name                    = "cft-vm-test-${random_string.suffix.result}"
+  auto_create_subnetworks = "false"
+}
+
+resource "google_compute_subnetwork" "main" {
+  project       = var.project_id
+  region        = var.region
+  name          = "cft-vm-test-${random_string.suffix.result}"
+  ip_cidr_range = "10.128.0.0/20"
+  network       = google_compute_network.main.self_link
+}
+
+module "instance_template" {
+  source             = "../../../modules/instance_template"
+  project_id         = var.project_id
+  subnetwork         = var.subnetwork
+  service_account    = var.service_account
+  subnetwork_project = var.project_id
+}
+
+module "mig" {
+  source            = "../../../modules/mig"
+  project_id        = var.project_id
+  region            = var.region
+  target_size       = var.target_size
+  hostname          = "mig-stateful"
+  instance_template = module.instance_template.self_link
+  stateful_internal_ips = [{
+    network_interface_name = "nic0"
+    delete_rule            = "ON_PERMANENT_INSTANCE_DELETION"
+  }]
+}
+
+resource "google_compute_region_disk" "default" {
+  project_id = var.project_id
+  type       = "pd-ssd"
+  zone       = var.region
+  image      = "debian-11-bullseye-v20220719"
+  labels = {
+    environment = "dev"
+  }
+  physical_block_size_bytes = 4096
+}

examples/mig/stateful/outputs.tf

@@ -0,0 +1,25 @@
+/**
+ * Copyright 2018 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+output "self_link" {
+  description = "Self-link of the managed instance group"
+  value       = module.mig.self_link
+}
+
+output "region" {
+  description = "The GCP region to create and test resources in"
+  value       = var.region
+}

examples/mig/stateful/variables.tf

@@ -0,0 +1,46 @@
+/**
+ * Copyright 2019 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+
+variable "project_id" {
+  description = "The GCP project to use for integration tests"
+  type        = string
+}
+
+variable "region" {
+  description = "The GCP region to create and test resources in"
+  type        = string
+  default     = "us-central1"
+}
+
+variable "subnetwork" {
+  description = "The subnetwork to host the compute instances in"
+}
+
+variable "target_size" {
+  description = "The target number of running instances for this managed instance group. This value should always be explicitly set unless this resource is attached to an autoscaler, in which case it should never be set."
+}
+
+variable "service_account" {
+  default = null
+  type = object({
+    email  = string
+    scopes = set(string)
+  })
+  description = "Service account to attach to the instance. See https://www.terraform.io/docs/providers/google/r/compute_instance_template#service_account."
+}
+

examples/mig/stateful/versions.tf

@@ -0,0 +1,29 @@
+/**
+ * Copyright 2018 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+terraform {
+  required_version = ">= 0.13"
+  required_providers {
+    google = {
+      source  = "hashicorp/google"
+      version = "~> 4.0"
+    }
+    google-beta = {
+      source  = "hashicorp/google-beta"
+      version = "~> 4.0"
+    }
+  }
+}

modules/mig/README.md

@@ -40,6 +40,8 @@ The current version is 2.X. The following guides are available to assist with up
 | region | The GCP region where the managed instance group resides. | `string` | n/a | yes |
 | scaling\_schedules | Autoscaling, scaling schedule block. https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/compute_autoscaler#scaling_schedules | <pre>list(object({<br>    disabled              = bool<br>    duration_sec          = number<br>    min_required_replicas = number<br>    name                  = string<br>    schedule              = string<br>    time_zone             = string<br>  }))</pre> | `[]` | no |
 | stateful\_disks | 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 | <pre>list(object({<br>    device_name = string<br>    delete_rule = string<br>  }))</pre> | `[]` | no |
+| stateful\_external\_ips | External IPs created on the instances that will be preserved on instance delete. https://cloud.google.com/compute/docs/instance-groups/configuring-stateful-ip-addresses-in-migs | <pre>list(object({<br>    network_interface_name = string<br>    delete_rule            = string<br>  }))</pre> | `[]` | no |
+| stateful\_internal\_ips | Internal IPs created on the instances that will be preserved on instance delete. https://cloud.google.com/compute/docs/instance-groups/configuring-stateful-ip-addresses-in-migs | <pre>list(object({<br>    network_interface_name = string<br>    delete_rule            = string<br>  }))</pre> | `[]` | no |
 | target\_pools | The target load balancing pools to assign this group to. | `list(string)` | `[]` | no |
 | target\_size | The target number of running instances for this managed instance group. This value should always be explicitly set unless this resource is attached to an autoscaler, in which case it should never be set. | `number` | `1` | no |
 | update\_policy | The rolling update policy. https://www.terraform.io/docs/providers/google/r/compute_region_instance_group_manager#rolling_update_policy | <pre>list(object({<br>    max_surge_fixed              = number<br>    instance_redistribution_type = string<br>    max_surge_percent            = number<br>    max_unavailable_fixed        = number<br>    max_unavailable_percent      = number<br>    min_ready_sec                = number<br>    replacement_method           = string<br>    minimal_action               = string<br>    type                         = string<br>  }))</pre> | `[]` | no |

modules/mig/main.tf

@@ -75,6 +75,22 @@ resource "google_compute_region_instance_group_manager" "mig" {
     }
   }
 
+  dynamic "stateful_internal_ip" {
+    for_each = var.stateful_internal_ips
+    content {
+      network_interface_name = stateful_internal_ip.value.network_interface_name
+      delete_rule            = lookup(stateful_internal_ip.value, "delete_rule", null)
+    }
+  }
+
+  dynamic "stateful_external_ip" {
+    for_each = var.stateful_external_ips
+    content {
+      network_interface_name = stateful_external_ip.value.network_interface_name
+      delete_rule            = lookup(stateful_external_ip.value, "delete_rule", null)
+    }
+  }
+
   distribution_policy_zones = local.distribution_policy_zones
   dynamic "update_policy" {
     for_each = var.update_policy

modules/mig/variables.tf

@@ -74,6 +74,27 @@ variable "stateful_disks" {
   default = []
 }
 
+#################
+# Stateful IPs
+#################
+variable "stateful_internal_ips" {
+  description = "Internal IPs created on the instances that will be preserved on instance delete. https://cloud.google.com/compute/docs/instance-groups/configuring-stateful-ip-addresses-in-migs"
+  type = list(object({
+    network_interface_name = string
+    delete_rule            = string
+  }))
+  default = []
+}
+
+variable "stateful_external_ips" {
+  description = "External IPs created on the instances that will be preserved on instance delete. https://cloud.google.com/compute/docs/instance-groups/configuring-stateful-ip-addresses-in-migs"
+  type = list(object({
+    network_interface_name = string
+    delete_rule            = string
+  }))
+  default = []
+}
+
 #################
 # Rolling Update
 #################

modules/mig_with_percent/README.md

@@ -41,6 +41,8 @@ The current version is 2.X. The following guides are available to assist with up
 | region | The GCP region where the managed instance group resides. | `string` | n/a | yes |
 | scaling\_schedules | Autoscaling, scaling schedule block. https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/compute_autoscaler#scaling_schedules | <pre>list(object({<br>    disabled              = bool<br>    duration_sec          = number<br>    min_required_replicas = number<br>    name                  = string<br>    schedule              = string<br>    time_zone             = string<br>  }))</pre> | `[]` | no |
 | stateful\_disks | 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 | <pre>list(object({<br>    device_name = string<br>    delete_rule = string<br>  }))</pre> | `[]` | no |
+| stateful\_external\_ips | External IPs created on the instances that will be preserved on instance delete. https://cloud.google.com/compute/docs/instance-groups/configuring-stateful-ip-addresses-in-migs | <pre>list(object({<br>    network_interface_name = string<br>    delete_rule            = string<br>  }))</pre> | `[]` | no |
+| stateful\_internal\_ips | Internal IPs created on the instances that will be preserved on instance delete. https://cloud.google.com/compute/docs/instance-groups/configuring-stateful-ip-addresses-in-migs | <pre>list(object({<br>    network_interface_name = string<br>    delete_rule            = string<br>  }))</pre> | `[]` | no |
 | target\_pools | The target load balancing pools to assign this group to. | `list(string)` | `[]` | no |
 | target\_size | The target number of running instances for this managed instance group. This value should always be explicitly set unless this resource is attached to an autoscaler, in which case it should never be set. | `number` | `1` | no |
 | update\_policy | The rolling update policy. https://www.terraform.io/docs/providers/google/r/compute_region_instance_group_manager#rolling_update_policy | <pre>list(object({<br>    max_surge_fixed              = number<br>    instance_redistribution_type = string<br>    max_surge_percent            = number<br>    max_unavailable_fixed        = number<br>    max_unavailable_percent      = number<br>    min_ready_sec                = number<br>    replacement_method           = string<br>    minimal_action               = string<br>    type                         = string<br>  }))</pre> | `[]` | no |

modules/mig_with_percent/main.tf

@@ -84,6 +84,22 @@ resource "google_compute_region_instance_group_manager" "mig_with_percent" {
     }
   }
 
+  dynamic "stateful_internal_ip" {
+    for_each = var.stateful_internal_ips
+    content {
+      network_interface_name = stateful_internal_ip.value.network_interface_name
+      delete_rule            = lookup(stateful_internal_ip.value, "delete_rule", null)
+    }
+  }
+
+  dynamic "stateful_external_ip" {
+    for_each = var.stateful_external_ips
+    content {
+      network_interface_name = stateful_external_ip.value.network_interface_name
+      delete_rule            = lookup(stateful_external_ip.value, "delete_rule", null)
+    }
+  }
+
   distribution_policy_zones = local.distribution_policy_zones
   dynamic "update_policy" {
     for_each = var.update_policy

modules/mig_with_percent/variables.tf

@@ -84,6 +84,27 @@ variable "stateful_disks" {
   default = []
 }
 
+#################
+# Stateful IPs
+#################
+variable "stateful_internal_ips" {
+  description = "Internal IPs created on the instances that will be preserved on instance delete. https://cloud.google.com/compute/docs/instance-groups/configuring-stateful-ip-addresses-in-migs"
+  type = list(object({
+    network_interface_name = string
+    delete_rule            = string
+  }))
+  default = []
+}
+
+variable "stateful_external_ips" {
+  description = "External IPs created on the instances that will be preserved on instance delete. https://cloud.google.com/compute/docs/instance-groups/configuring-stateful-ip-addresses-in-migs"
+  type = list(object({
+    network_interface_name = string
+    delete_rule            = string
+  }))
+  default = []
+}
+
 #################
 # Rolling Update
 #################