Support for creating incremental azurerm_snapshot resources

[SergioLuis]

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Description

I'm using a certain kind of managed disk (PremiumV2_LRS). These disks support only incremental snapshots. However, the resource azurerm_snapshot doesn't seem to be able to be created with said flag.

The azurerm_snapshot.create_option attribute only supports Import and Copy. I dived into the code of both azurerm and Terraform Azure SDK, and did not find anything resembling "incremental" regarding snapshots.

I can create the snapshot with no issues using the az command line tool:

$ az snapshot create \
  --name metadata-disk-snapshot \
  --resource-group storage-resources \
  --source "/subscriptions/0000(...)/disks/metadata-disk" \
  --incremental true

When using Terraform with create_option = "Copy" I get a meaningful error message regarding this limitation:

**Error: creating/updating Snapshot (Subscription: "(...)" Resource Group Name: "storage-resources" Snapshot Name: "metadata-disk-snapshot"): performing CreateOrUpdate: snapshots.SnapshotsClient#CreateOrUpdate: Failure sending request: StatusCode=0 -- Original Error: Code="OperationNotAllowed" Message="Only incremental snapshots are supported for disks of Sku PremiumV2\_LRS."**
with module.(...)\_metadata\_disk\_snapshot
on .terraform/modules/(...)/main.tf line 30, in resource "azurerm\_snapshot" "storage\_metadata\_disk\_snapshot":

And, of course, using create_option = "Import" does not work, because I'm using the disk ID as the source_uri:

**Error: creating/updating Snapshot (Subscription: "(...)" Resource Group Name: "storage-resources" Snapshot Name: "metadata-disk-snapshot"): performing CreateOrUpdate: snapshots.SnapshotsClient#CreateOrUpdate: Failure sending request: StatusCode=0 -- Original Error: Code="InvalidParameter" Message="Uri not of expected kind" Target="sourceUri"**
with module.(...)\_metadata\_disk\_snapshot
on .terraform/modules/(...)/main.tf line 30, in resource "azurerm\_snapshot" "storage\_metadata\_disk\_snapshot":

New or Affected Resource(s)/Data Source(s)

azurerm_snapshot

Potential Terraform Configuration

resource "azurerm_resource_group" "storage_resource_group" {
  name      = "storage-resources"
  location  = "West Europe"
}

resource "azurerm_managed_disk" "storage_metadata_disk" {
  name                 = "metadata-disk"
  location             = azurerm_resource_group.storage_resource_group.location
  resource_group_name  = azurerm_resource_group.storage_resource_group.name
  zone                 = 1
  storage_account_type = "PremiumV2_LRS"
  create_option        = "Empty"
  disk_size_gb         = 1024
  disk_iops_read_write = 300
  disk_mbps_read_write = 512
}

resource "azurerm_snapshot" "storage_metadata_disk_snapshot" {
  name                = "metadata-disk-snapshot"
  location            = azurerm_resource_group.storage_resource_group.location
  resource_group_name = azurerm_resource_group.storage_resource_group.name
  source_uri          = azurerm_managed_disk.storage_metadata_disk.id
  create_option       = "Incremental"
}

References

• https://stackoverflow.com/questions/75814205/create-incremental-azure-managed-disk-snapshots-using-terraform

[github-actions]

This functionality has been released in v3.51.0 of the Terraform Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!