Azure Linux虚拟机Terraform Map变量配置错误求助

错误信息 #

"The given value is not suitable for var.vm_properties declared at variables.tf:147,1-25: element "os_disk": attributes "os_disk" and "source_image" are required."

问题根源 #

你的vm_properties变量被定义为map(object(...))，意味着它是一个键值对集合，每个值必须是包含os_disk和source_image的完整对象。但在terraform.tfvars中，你直接把os_disk和source_image作为了vm_properties的顶层键，导致Terraform无法识别出符合类型要求的结构。

修复方案 #

方案一：调整变量类型（适合单VM场景） #

如果只需要配置一台虚拟机，修改variables.tf，将map(object(...))改为直接的object(...)，让变量直接对应一组VM属性：

variable "vm_properties" {
  type = object({
    os_disk = object({
      name                 = string
      caching              = string
      storage_account_type = string
    })
    source_image = object({
      publisher = string
      offer     = string
      sku       = string
      version   = string
    })
  })
}

修改后，terraform.tfvars和main.tf的代码无需调整，类型即可完全匹配。

方案二：调整tfvars结构（适合多VM批量创建） #

如果需要通过该变量批量定义多台虚拟机，保持variables.tf的map(object(...))定义不变，修改terraform.tfvars给每个VM添加独立的顶层键：

vm_properties = {
  vm1 = {
    os_disk = {
      name                 = "myOsDisk"
      caching              = "ReadWrite"
      storage_account_type = "Premium_LRS"
    }
    source_image = {
      publisher = "Canonical"
      offer     = "UbuntuServer"
      sku       = "18.04-LTS"
      version   = "latest"
    }
  }
  # 可继续添加vm2、vm3等虚拟机配置
}

同时修改main.tf，用for_each遍历变量批量创建虚拟机：

resource "azurerm_linux_virtual_machine" "example" {
  for_each = var.vm_properties

  # 补充虚拟机必填属性（示例值需替换为实际内容）
  name                = each.key
  resource_group_name = "your-resource-group"
  location            = "your-location"
  size                = "Standard_D2s_v3"
  admin_username      = "adminuser"
  admin_ssh_key {
    username   = "adminuser"
    public_key = file("~/.ssh/id_rsa.pub")
  }

  os_disk {
    name                 = each.value["os_disk"]["name"]
    caching              = each.value["os_disk"]["caching"]
    storage_account_type = each.value["os_disk"]["storage_account_type"]
  }

  source_image_reference {
    publisher = each.value["source_image"]["publisher"]
    offer     = each.value["source_image"]["offer"]
    sku       = each.value["source_image"]["sku"]
    version   = each.value["source_image"]["version"]
  }
}

内容的提问来源于stack exchange，提问作者Susheel Bhatt