Allow updating GCE VM’s external ipv6 address without VM recreation #25324
Description
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Description
At this moment, updating GCE VM’s external ipv6 address leads to VM recreation while updating via console web UI doesn't.
Details in internal issue tracker: b/463822798
New or Affected Resource(s)
- google_compute_instance
Potential Terraform Configuration
resource "google_compute_network" "test-vpc-net" {
name = "vpc-network-dual-stack-ipv6"
auto_create_subnetworks = false
enable_ula_internal_ipv6 = true
}
resource "google_compute_subnetwork" "subnet_dual_stack" {
name = "subnet-dual-stack"
ip_cidr_range = "10.0.0.0/22"
region = "us-central1"
stack_type = "IPV4_IPV6"
ipv6_access_type = "EXTERNAL"
network = google_compute_network.test-vpc-net.id
}
resource "google_compute_address" "old_static_external_ipv6" {
name = "test-new-ipv6-address"
region = "us-central1"
subnetwork = google_compute_subnetwork.subnet_dual_stack.id
ip_version = "IPV6"
address = "2600:1900:4000:d660:0:1::"
ipv6_endpoint_type = "VM"
}
resource "google_compute_address" "new_static_external_ipv6" {
name = "test-old-ipv6-address"
region = "us-central1"
subnetwork = google_compute_subnetwork.subnet_dual_stack.id
ip_version = "IPV6"
address = "2600:1900:4000:d660:0:2::"
ipv6_endpoint_type = "VM"
}
resource "google_compute_instance" "test-vm" {
name = "test-vm"
machine_type = "n1-standard-1"
zone = "us-central1-a"
boot_disk {
initialize_params {
image = "debian-cloud/debian-11"
size = 200
}
}
network_interface {
network = google_compute_network.test-vpc-net.id
subnetwork = google_compute_subnetwork.subnet_dual_stack.id
stack_type = "IPV4_IPV6"
ipv6_access_config {
external_ipv6 = google_compute_address.old_static_external_ipv6.address
# update to `external_ipv6 = google_compute_address.old_static_external_ipv6.address` triggers VM recreation
external_ipv6_prefix_length = 96
name = "test-vm-ipv6-name"
network_tier = "PREMIUM"
}
}
}While console web UI is able to update it without VM creation by call API beta.compute.instances.updateNetworkInterface.
References
Field external_ipv6 is marked as forceNew https://github.com/hashicorp/terraform-provider-google/blob/main/google/services/compute/resource_compute_instance.go#L750C11-L750C24, meaning any modification will cause a recreate. https://googlecloudplatform.github.io/magic-modules/best-practices/immutable-fields/
b/467075908