Cannot increase maximum size of Azure VMSS

[georgespatton]

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I can't increase the size of an existing VMSS within Azure. It was created via terraform originally. I am using the latest version of terraform. I tried the latest version of provider.azurerm (v1.17.0) with the same behavior.

$ terraform plan

Error: module.ourmodule.azurerm_autoscale_setting.vmss-autoscale-cpu: expected profile.0.capacity.0.maximum to be in the range (1 - 40), got 1000

$ terraform -version
Terraform v0.11.9
+ provider.azurerm v1.16.0
+ provider.random v2.0.0


$ git diff
diff --git a/avmss.tf
index 152733e..de42594 100644
--- a/vmss.tf
+++ b/vmss.tf
@@ -91,7 +91,7 @@ resource "azurerm_autoscale_setting" "vmss-autoscale-cpu" {
     capacity {
       default = 10
       minimum = 10
-      maximum = 40
+      maximum = 1000
     }
 
$ cat vmss.tf 

.......

### Configuration for Service azurerm_autoscale_setting ###
##
##
resource "azurerm_autoscale_setting" "prod-autoscale-cpu" {
  name                = "Percentage CPU"
  resource_group_name = "${var.resource_group_name}"
  location            = "${var.location}"
  target_resource_id  = "${azurerm_virtual_machine_scale_set.prod-ss.id}"

  profile {
    name = "Percentage CPU"
    capacity {
      default = 10
      minimum = 10
      maximum = 1000
    }

.........

To reproduce, create an Azure VMSS with terraform with set minimum/maximum/default values. Then increase the maximum setting. It should fail as this does.

[georgespatton]

Why are we limited to 40 VMSS max instances in the terraform config?

[georgespatton]

PR pending review here: #2806

[ghost]

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