feat: add support for adding additional network interfaces (#199)

* Additional Network Interface Support

* Update README.md with params

* Fixing Lint Errors

* Fixing Lint Errors

Co-authored-by: Stenal P Jolly <[email protected]>

Author: stenalpjolly

modules/instance_template/README.md

@@ -15,6 +15,7 @@ See the [simple](../../examples/instance_template/simple) for a usage example.
 |------|-------------|------|---------|:--------:|
 | access\_config | Access configurations, i.e. IPs via which the VM instance can be accessed via the Internet. | <pre>list(object({<br>    nat_ip       = string<br>    network_tier = string<br>  }))</pre> | `[]` | no |
 | additional\_disks | List of maps of additional disks. See https://www.terraform.io/docs/providers/google/r/compute_instance_template.html#disk_name | <pre>list(object({<br>    disk_name    = string<br>    device_name  = string<br>    auto_delete  = bool<br>    boot         = bool<br>    disk_size_gb = number<br>    disk_type    = string<br>    disk_labels  = map(string)<br>  }))</pre> | `[]` | no |
+| additional\_networks | Additional network interface details for GCE, if any. | <pre>list(object({<br>    network            = string<br>    subnetwork         = string<br>    subnetwork_project = string<br>    network_ip         = string<br>    access_config = list(object({<br>      nat_ip       = string<br>      network_tier = string<br>    }))<br>  }))</pre> | `[]` | no |
 | auto\_delete | Whether or not the boot disk should be auto-deleted | `string` | `"true"` | no |
 | can\_ip\_forward | Enable IP forwarding, for NAT instances for example | `string` | `"false"` | no |
 | disk\_encryption\_key | The self link of the encryption key that is stored in Google Cloud KMS to use to encrypt all the disks on this instance | `string` | `null` | no |

modules/instance_template/main.tf

@@ -112,6 +112,23 @@ resource "google_compute_instance_template" "tpl" {
     }
   }
 
+  dynamic "network_interface" {
+    for_each = var.additional_networks
+    content {
+      network            = network_interface.value.network
+      subnetwork         = network_interface.value.subnetwork
+      subnetwork_project = network_interface.value.subnetwork_project
+      network_ip         = length(network_interface.value.network_ip) > 0 ? network_interface.value.network_ip : null
+      dynamic "access_config" {
+        for_each = network_interface.value.access_config
+        content {
+          nat_ip       = access_config.value.nat_ip
+          network_tier = access_config.value.network_tier
+        }
+      }
+    }
+  }
+
   lifecycle {
     create_before_destroy = "true"
   }

modules/instance_template/variables.tf

@@ -153,6 +153,21 @@ variable "network_ip" {
   default     = ""
 }
 
+variable "additional_networks" {
+  description = "Additional network interface details for GCE, if any."
+  default     = []
+  type = list(object({
+    network            = string
+    subnetwork         = string
+    subnetwork_project = string
+    network_ip         = string
+    access_config = list(object({
+      nat_ip       = string
+      network_tier = string
+    }))
+  }))
+}
+
 ###########
 # metadata
 ###########

modules/umig/README.md

@@ -16,6 +16,7 @@ See the [simple](https://github.com/terraform-google-modules/terraform-google-vm
 | Name | Description | Type | Default | Required |
 |------|-------------|------|---------|:--------:|
 | access\_config | Access configurations, i.e. IPs via which the VM instance can be accessed via the Internet. | <pre>list(list(object({<br>    nat_ip       = string<br>    network_tier = string<br>  })))</pre> | `[]` | no |
+| additional\_networks | Additional network interface details for GCE, if any. | <pre>list(object({<br>    network            = string<br>    subnetwork         = string<br>    subnetwork_project = string<br>    network_ip         = string<br>    access_config = list(object({<br>      nat_ip       = string<br>      network_tier = string<br>    }))<br>  }))</pre> | `[]` | no |
 | hostname | Hostname of instances | `string` | `""` | no |
 | instance\_template | Instance template self\_link used to create compute instances | `any` | n/a | yes |
 | named\_ports | Named name and named port | <pre>list(object({<br>    name = string<br>    port = number<br>  }))</pre> | `[]` | no |

modules/umig/main.tf

@@ -66,6 +66,23 @@ resource "google_compute_instance_from_template" "compute_instance" {
     }
   }
 
+  dynamic "network_interface" {
+    for_each = var.additional_networks
+    content {
+      network            = network_interface.value.network
+      subnetwork         = network_interface.value.subnetwork
+      subnetwork_project = network_interface.value.subnetwork_project
+      network_ip         = length(network_interface.value.network_ip) > 0 ? network_interface.value.network_ip : null
+      dynamic "access_config" {
+        for_each = network_interface.value.access_config
+        content {
+          nat_ip       = access_config.value.nat_ip
+          network_tier = access_config.value.network_tier
+        }
+      }
+    }
+  }
+
   source_instance_template = var.instance_template
 }
 

modules/umig/variables.tf

@@ -40,6 +40,21 @@ variable "subnetwork_project" {
   default     = ""
 }
 
+variable "additional_networks" {
+  description = "Additional network interface details for GCE, if any."
+  default     = []
+  type = list(object({
+    network            = string
+    subnetwork         = string
+    subnetwork_project = string
+    network_ip         = string
+    access_config = list(object({
+      nat_ip       = string
+      network_tier = string
+    }))
+  }))
+}
+
 variable "hostname" {
   description = "Hostname of instances"
   default     = ""