使用Terraform挂载已有磁盘至Windows VM时遇Unsupported block type错误

错误原因 #

你使用的AzureRM Provider 3.x版本对azurerm_windows_virtual_machine的磁盘配置结构做了重大调整：

• 原storage_os_disk块已不再适用于当前资源结构；且你要挂载的是数据盘而非系统盘，错误使用了系统盘配置块。

修正方案 #

情况1：挂载已有磁盘作为额外数据盘 #

将虚拟机配置中的storage_os_disk块替换为storage_data_disk块，调整参数适配数据盘挂载要求：

# Create virtual machine
resource "azurerm_windows_virtual_machine" "main" {
  name                  = "${var.prefix}-vm"
  admin_username        = "azureuser"
  admin_password        = random_password.password.result
  location              = "East Us"
  resource_group_name   = "vm-terraform-demo"
  network_interface_ids = [azurerm_network_interface.my_terraform_nic.id]
  size                  = "Standard_DS1_v2"

  # 挂载已有数据盘
  storage_data_disk {
    name            = azurerm_managed_disk.test2.name
    managed_disk_id = azurerm_managed_disk.test2.id
    caching         = "ReadWrite"
    create_option   = "Attach"
    lun             = 0  # LUN编号从0开始，确保不与其他磁盘冲突
    disk_size_gb    = azurerm_managed_disk.test2.disk_size_gb
  }

  source_image_reference {
    publisher = "MicrosoftWindowsServer"
    offer     = "WindowsServer"
    sku       = "2022-datacenter-azure-edition"
    version   = "latest"
  }

  boot_diagnostics {
    storage_account_uri = azurerm_storage_account.my_storage_account.primary_blob_endpoint
  }
}

情况2：将已有磁盘作为系统盘使用 #

如果你的需求是用已有磁盘作为VM的系统盘（而非额外数据盘），需移除source_image_reference块，改用os_disk块配置：

# Create virtual machine
resource "azurerm_windows_virtual_machine" "main" {
  name                  = "${var.prefix}-vm"
  admin_username        = "azureuser"
  admin_password        = random_password.password.result
  location              = "East Us"
  resource_group_name   = "vm-terraform-demo"
  network_interface_ids = [azurerm_network_interface.my_terraform_nic.id]
  size                  = "Standard_DS1_v2"

  # 将已有磁盘作为系统盘
  os_disk {
    name            = azurerm_managed_disk.test2.name
    managed_disk_id = azurerm_managed_disk.test2.id
    caching         = "ReadWrite"
    create_option   = "Attach"
  }

  boot_diagnostics {
    storage_account_uri = azurerm_storage_account.my_storage_account.primary_blob_endpoint
  }
}

关键注意事项 #

• LUN编号：数据盘的lun需从0开始，且每个磁盘的LUN必须唯一，避免冲突。
• 磁盘状态：确保要挂载的azurerm_managed_disk.test2未被其他VM占用，且与VM处于同一区域。
• Provider版本：AzureRM 3.x版本的虚拟机资源结构与2.x差异较大，系统盘需用os_disk块，数据盘需用storage_data_disk块。

内容的提问来源于stack exchange，提问作者Michael Mok