AKS cluster creation fails when (optional) subnet_id is undefined

[vanappmi]

Terraform Version

2018/04/26 10:36:41 [INFO] Terraform version: 0.11.7  41e50bd32a8825a84535e353c3674af8ce799161

Terraform Configuration Files

AKS configuration file

resource "azurerm_kubernetes_cluster" "container_service" {
  name                = "${local.aks_name}"
  resource_group_name = "${azurerm_resource_group.k8s_0.name}"
  location            = "${azurerm_resource_group.k8s_0.location}"
  kubernetes_version  = "${local.aks_version}"
  dns_prefix          = "${local.aks_dns_name_prefix}"

  agent_pool_profile {
    name            = "agentpools"
    count           = "${local.aks_agent_pool_count}"
    vm_size         = "${local.aks_agent_pool_vm_size}"
    os_type         = "${local.aks_agent_pool_os_type}"
    os_disk_size_gb = "${local.aks_agent_pool_os_disk_size_gb}"

    #    vnet_subnet_id = "${azurerm_subnet.aks.id}"
  }

  linux_profile {
    admin_username = "${local.linux_admin_user}"

    ssh_key {
      key_data = "${file("${path.module}/id_agents.pub")}"
    }
  }

  service_principal {
    client_id     = "${local.service_principal_client_id}"
    client_secret = "${local.service_principal_client_secret}"
  }
}

## vars
locals {
  # Global
  name_prefix             = "c11h-glass"
  resource_group_location = "westeurope"
  resource_group_name     = "glass-${terraform.workspace}"

  # AKS
  aks_name               = "${local.name_prefix}-${terraform.workspace}"
  aks_agent_pool_count   = "${terraform.workspace == "default" ? 3 : 2}"
  aks_agent_pool_vm_size = "Standard_F2s"
  aks_master_count       = 2
  aks_dns_name_prefix    = "k8s-${terraform.workspace}"

  aks_agent_pool_os_disk_size_gb = "30"
  aks_agent_pool_os_type         = "Linux"
  aks_dns_prefix                 = "${local.name_prefix}-${terraform.workspace}"
  aks_version                    = "1.9.6"

  linux_admin_user = "azadmin"
}

Debug Output

https://gist.github.com/vanappmi/d9f964aff8773ae9bca1b91ca3799926

Expected Behavior

Create an AKS cluster without the need to define an (optional) subnet_id

Actual Behavior

Only runs with pre-defined subnet_id config ( -- Original Error: Code="LinkedInvalidPropertyId" Message="Property id '' at path 'properties.agentPoolProfiles[0].vnetSubnetID' is invalid. Expect fully qualified resource Id that start with '/subscriptions/{subscriptionId}' or '/providers/{resourceProviderNamespace}/'.")

Steps to Reproduce

1. terraform init
2. terraform apply

Additional Context

Worked maybe a week ago. Also tried terraform 0.11.3.
Also tried different fqdn- and aks-names because of possible max-length issues.
Also, there is no sign of the problem in the Azure activity log (fails on api call)

[fmunozn]

Hi,

The same is happening to me. I even created a Virtual network and tried to create the cluster and it didn't work either.

[Ycallaer]

+1
Since today I can no longer deploy my kubernetes cluster
Please fix as this is blocking kubernetes deployments

[iorlas]

+1 It is blocker in our product. Please. Please. Please.

[jbardin]

This looks like a duplicate of hashicorp/terraform-provider-azurerm#1166

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.