azurerm_kubernetes_cluster - web_app_routing.dns_zone_ids has incorrect minimum item requirement

[NickG158]

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Terraform Version

1.8.3

AzureRM Provider Version

3.113.0

Affected Resource(s)/Data Source(s)

azurerm_kubernetes_cluster

Terraform Configuration Files

resource "azurerm_resource_group" "default" {
  name     = "rgakstest"
  location = "westeurope"
}

resource "azurerm_kubernetes_cluster" "default" {
  name = "aks-test-cluster"
  dns_prefix = "testwebappissue"

  identity {
    type = "SystemAssigned"
  }

  default_node_pool {
    name       = "default"
    node_count = 1
    vm_size    = "Standard_B2as_v2"
  }

  location            = "westeurope"
  resource_group_name = azurerm_resource_group.default.name

  web_app_routing {
    dns_zone_ids = []
  }
}

Debug Output/Panic Output

╷
│ Error: Not enough list items
│
│   with azurerm_kubernetes_cluster.default,
│   on resource_group.tf line 33, in resource "azurerm_kubernetes_cluster" "default":
│   33:     dns_zone_ids = []
│
│ Attribute web_app_routing.0.dns_zone_ids requires 1 item minimum, but config has only 0 declared.

Expected Behaviour

Plan should have seen there was no changes and completed without error.

Actual Behaviour

Since updating our terraform to use a list for dns_zone_ids in the web_app_routing block instead of the singular string dns_zone_id we have noticed the above error when passing an empty list ( [] ) to the dns_zone_ids property.

The docs suggest we should be passing an empty list, "If not using Bring-Your-Own DNS zones this property should be set to an empty list."

https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/kubernetes_cluster#dns_zone_ids

I'd guess it's this line causing the error, as it sets a MinItems of 1:

https://github.com/hashicorp/terraform-provider-azurerm/pull/26117/files#diff-6a7f7d2789c7df9bc827ae00ddcf7d3fbf97b87d414313e0bf99fa55562b0090R440

Steps to Reproduce

Try to create an AKS cluster using the web app routing addon with dns_zone_ids set to an empty list.

Important Factoids

No response

References

#26117

[eissko]

yeap. same on my side. it's not implemented according the description which says to use empty list but when empty list is used, the plan fails.

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