azurerm_virtual_network resource, subnet doesn't recognize delegation block

[stan-spotts]

Is there an existing issue for this?

• I have searched the existing issues

Community Note

• Please vote on this issue by adding a 👍 reaction to the original issue to help the community and maintainers prioritize this request
• Please do not leave comments along the lines of "+1", "me too" or "any updates", they generate extra noise for issue followers and do not help prioritize the request
• If you are interested in working on this issue or have submitted a pull request, please leave a comment and review the contribution guide to help.

Terraform Version

1.9.2

AzureRM Provider Version

3.115.0

Affected Resource(s)/Data Source(s)

azurerm_virtual_network

Terraform Configuration Files

resource "azurerm_virtual_network" "vnet" {
  name                = var.vnet_name
  location            = var.location
  resource_group_name = var.resource_group_name
  address_space       = var.address_space
  tags                = var.tags

  subnet {
    name = var.subnet_name
    address_prefix = var.subnet_address
    security_group = var.subnet_nsg_name
  }
  
  subnet {
    name           = var.github_subnet_name
    address_prefix = var.github_subnet_cidr
    security_group = var.github_nsg_name

    delegation {
      name = "github_network_delegation"
      service_delegation {
        name    = "GitHub.Network/networkSettings"
        actions = ["Microsoft.Network/virtualNetworks/subnets/action"]
      }
    }
  }
}

Debug Output/Panic Output

Error from terraform plan:
│ Error: Unsupported block type
│
│   on ..\..\modules\vnet\main.tf line 21, in resource "azurerm_virtual_network" "vnet":
│   21:     delegation {
│
│ Blocks of type "delegation" are not expected here.

Debug log after all the provider info:
2024-09-05T12:07:31.579-0400 [DEBUG] provider: using plugin: version=5
2024-09-05T12:07:31.635-0400 [DEBUG] created provider logger: level=debug
2024-09-05T12:07:31.635-0400 [INFO]  provider: configuring client automatic mTLS
2024-09-05T12:07:31.668-0400 [DEBUG] provider: starting plugin: path=.terraform/providers/registry.terraform.io/hashicorp/time/0.12.0/windows_386/terraform-provider-time_v0.12.0_x5.exe args=[".terraform/providers/registry.terraform.io/hashicorp/time/0.12.0/windows_386/terraform-provider-time_v0.12.0_x5.exe"]
2024-09-05T12:07:31.675-0400 [DEBUG] provider: plugin started: path=.terraform/providers/registry.terraform.io/hashicorp/time/0.12.0/windows_386/terraform-provider-time_v0.12.0_x5.exe pid=33992
2024-09-05T12:07:31.675-0400 [DEBUG] provider: waiting for RPC address: plugin=.terraform/providers/registry.terraform.io/hashicorp/time/0.12.0/windows_386/terraform-provider-time_v0.12.0_x5.exe
2024-09-05T12:07:31.715-0400 [INFO]  provider.terraform-provider-time_v0.12.0_x5.exe: configuring server automatic mTLS: timestamp=2024-09-05T12:07:31.713-0400
2024-09-05T12:07:31.807-0400 [DEBUG] provider.terraform-provider-time_v0.12.0_x5.exe: plugin address: address=127.0.0.1:10001 network=tcp timestamp=2024-09-05T12:07:31.807-0400
2024-09-05T12:07:31.807-0400 [DEBUG] provider: using plugin: version=5
2024-09-05T12:07:31.861-0400 [ERROR] vertex "module.shared_vnet.azurerm_virtual_network.vnet" error: Unsupported block type
2024-09-05T12:07:31.868-0400 [DEBUG] provider.stdio: received EOF, stopping recv loop: err="rpc error: code = Unavailable desc = error reading from server: EOF"
2024-09-05T12:07:31.874-0400 [INFO]  provider: plugin process exited: plugin=.terraform/providers/registry.terraform.io/hashicorp/time/0.12.0/windows_386/terraform-provider-time_v0.12.0_x5.exe id=33992
2024-09-05T12:07:31.874-0400 [DEBUG] provider: plugin exited

Expected Behaviour

Should have created VNET and subnets, with delegation on second subnet.

Actual Behaviour

Failed saying delegation was unsupported/not expected. Documentation specifically identifies delegation block as being supported and describes properties.

Steps to Reproduce

terraform plan

Important Factoids

No response

References

https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/virtual_network#delegation

[neil-yechenwei]

Thanks for raising this issue. Please use latest azurerm provider v4.x for delegation.

[rcskosir]

Thanks for taking the time to submit this issue. @neil-yechenwei is right that this is available in the latest version of the provider. As such, I am going to mark this issue as closed. Please upgrade to a v4.x version of the provider to use the functionality.