azurerm_kubernetes_cluster not working with Gen2 vm_size

[shebang89]

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Terraform (and AzureRM Provider) Version

Terraform v0.13.0-beta3

• provider registry.terraform.io/hashicorp/azurerm v2.20.0

Affected Resource(s)

• azurerm_kubernetes_cluster
• azurerm_kubernetes_cluster_node_pool

Terraform Configuration Files

provider "azurerm" {
  version = "=2.20.0"
  features {}
}

resource "azurerm_resource_group" "rg" {
  name     = "aks-rg-01"
  location = "West Europe"
}

resource "azurerm_kubernetes_cluster" "aks" {
  name                    = "aks-test"
  location                = azurerm_resource_group.rg.location
  resource_group_name     = azurerm_resource_group.rg.name
  dns_prefix              = "myaks"
  kubernetes_version      = "1.18.4"
  private_cluster_enabled = false

  default_node_pool {
    name       = "default"
    vm_size    = "Standard_DC2s_v2"
    node_count = 1
  }

  identity {
    type = "SystemAssigned"
  }
}

Expected Behavior

Apply complete! Resources: 2 added, 0 changed, 0 destroyed.

Actual Behavior

Error: waiting for creation of Managed Kubernetes Cluster "aks-test" (Resource Group "aks-rg-01"): Code="CreateVMSSAgentPoolFailed" Message="VMSSAgentPoolReconciler retry failed: deployment operations failed with error messages: {\n "code": "BadRequest",\n "message": "The selected VM Size 'Standard_DC2s_v2' cannot boot Hypervisor Generation '1'. If this was a Create operation please check that the Hypervisor Generation of the Image matches the Hypervisor Generation of the selected VM Size. If this was an Update operation please select a Hypervisor Generation '1' VM Size."\n } "

on main.tf line 11, in resource "azurerm_kubernetes_cluster" "aks":
11: resource "azurerm_kubernetes_cluster" "aks" {

Steps to Reproduce

1. terraform apply

Additional information

Since Terraform didn't work out I had to fall back to az cli, which gave me the exact same error as Terraform did.
After some research in Azure documentation, I figured out I need to install the aks-preview extension in az cli to be able to provision AKS clusters with Gen2 VM sizes.

Here are the steps for a successful deployment with az cli:

az extension add --name aks-preview
az feature register --name Gen2VMPreview --namespace Microsoft.ContainerService
az feature list -o table --query "[?contains(name, 'Microsoft.ContainerService/Gen2VMPreview')].{Name:name,State:properties.state}" (wait until status is "Registered" before proceeding to next step)
az provider register --namespace Microsoft.ContainerService
az group create --name aks-test-rg --location westeurope && \
az aks create \
--name aks-test \
--resource-group aks-test-rg \
--kubernetes-version 1.18.4 \
--node-count 3 \
--node-vm-size Standard_DC2s_v2 \
--aks-custom-headers usegen2vm=true

[tombuildsstuff]

hi @shebang89

Thanks for opening this issue :)

Taking a look through this appears to be a duplicate of #6793 - rather than having multiple issues open tracking the same thing I'm going to close this issue in favour of that one; would you mind subscribing to #6793 for updates?

Thanks!

[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 feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. If you feel I made an error 🤖 🙉 , please reach out to my human friends 👉 [email protected]. Thanks!