terraform 报告错误 "cannot use element function with an empty list"

Question

我的网卡创建代码如下：

resource "azurerm_network_interface" "tf-ni-test" {
 count                     = "${var.count_sss_vm}"
 name                      = "${var.sss_base_hostname}${format("%02d",count.index+1)}-nic01"
 #location                 = "${data.azurerm_resource_group.tf-rg-test-external.location}"
 location                  = "${var.location}"  
 resource_group_name       = "${data.azurerm_resource_group.tf-rg-test-external.name}"

 ip_configuration {
    name                          = "${var.sss_base_hostname}${format("%02d",count.index+1)}-iip01"
    subnet_id                     = "${data.azurerm_subnet.tf-sn-test.id}"
    private_ip_address_allocation = "${var.env=="msdn"?"dynamic":"static"}"
    #private_ip_address            = "10.112.2.${count.index+10}"
    public_ip_address_id          = "${element(azurerm_public_ip.tf-pip-test.*.id,count.index+1)}"
 }
}

VM创建代码如下：

resource "azurerm_virtual_machine" "tf-vm-test" {
  count                 = "${var.count_sss_vm}"
  name                  = "${var.sss_base_hostname}${format("%02d",count.index+1)}"
  location              = "${var.location}"  
  #location              = "${data.azurerm_resource_group.tf-rg-test-external.location}"
  resource_group_name   = "${data.azurerm_resource_group.tf-rg-test-external.name}"
  network_interface_ids = ["${element(azurerm_network_interface.tf-ni-test.*.id, count.index)}"]
  vm_size               = "${var.sss_vm_size}"
.
.
.
}

我是运行 terraform 计划，命令如下：

terraform plan -var "application_nsg=test-sss" -var "count_sss_vm=2" -var "env=msdn" -var "username=devopsadmin" -var "password=Angular1@#$" -var "sss_base_hostname=testsss" -var "sss_vm_size=Standard_B2s" -var "storage_account_suffix=sta" -var "win_image_offer=Windows" -var "win_image_publisher=microsoftvisualstudio" -var "win_sku=Windows-10-N-x64" -var "location=australiaeast"

想知道为什么报错以及如何解决。相同的代码以前也有。这是因为 TF v0.12 吗？

我在 github 上发现了类似的问题，实际上使用的是 Hashicorp 给出的相同方法： https://github.com/terraform-providers/terraform-provider-azurerm/issues/3979

我收到如下错误：

Error: Error in function call

  on frednxt_tpi_standalone.tf line 123, in resource "azurerm_virtual_machine" "tf-vm-test":
 123:   network_interface_ids = ["${element(azurerm_network_interface.tf-ni-test.*.id, count.index)}"]
    |----------------
    | azurerm_network_interface.tf-ni-test is empty tuple
    | count.index is 0

Call to function "element" failed: cannot use element function with an empty
list.


Error: Error in function call

  on frednxt_tpi_standalone.tf line 123, in resource "azurerm_virtual_machine" "tf-vm-test":
 123:   network_interface_ids = ["${element(azurerm_network_interface.tf-ni-test.*.id, count.index)}"]
    |----------------
    | azurerm_network_interface.tf-ni-test is empty tuple
    | count.index is 1

Call to function "element" failed: cannot use element function with an empty
list.

Answer 1

不确定，但我在使用 0.12 版本的 terraform 时重现了错误。当我使用命令 terraform 0.12upgrade 升级 Terraform 时，它工作正常。而且我也找不到你提供的代码中的问题。

所以你可以删除状态文件，升级 Terraform 然后再试一次。

terraform 报告错误 "cannot use element function with an empty list"

terraform reporting error "cannot use element function with an empty list"

azure-virtual-machine

terraform-provider-azure