changing azurerm_managed_disk disk tags causes VM reboot

[shurikk]

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Terraform (and AzureRM Provider) Version

Terraform v0.12.21

• provider.azurerm v1.44.0

Affected Resource(s)

• azurerm_managed_disk

Terraform Configuration Files

data "azurerm_resource_group" "rg" {
  name = "<RESOURCE_GROUP_NAME>"
}

resource "azurerm_network_interface" "vm1234-nic" {
  name                = "vm1234-nic"
  location            = data.azurerm_resource_group.rg.location
  resource_group_name = data.azurerm_resource_group.rg.name

  ip_configuration {
    name                          = "vm1234-ip"
    subnet_id = "<SUBNET_ID>"
    private_ip_address_allocation = "Dynamic"
  }
}

resource "azurerm_managed_disk" "vm1234_data_disk_1" {
  location             = data.azurerm_resource_group.rg.location
  resource_group_name  = data.azurerm_resource_group.rg.name

  name  = "vm1234_data_disk_1"
  storage_account_type = "Standard_LRS"
  disk_size_gb         = "32"
  create_option        = "Empty"
  tags = {
    "tag1" = "value1"
    #"tag2" = "value2"
  }
}

resource "azurerm_virtual_machine" "vm1234" {
  name                  = "vm1234"
  resource_group_name   = data.azurerm_resource_group.rg.name
  location = data.azurerm_resource_group.rg.location
  network_interface_ids = [azurerm_network_interface.vm1234-nic.id]
  vm_size               = "Standard_B1ls"

  storage_os_disk {
    name              = "vm1234-disk"
    caching           = "ReadWrite"
    create_option     = "FromImage"
    managed_disk_type = "Premium_LRS"
  }

  storage_image_reference {
    publisher = "Canonical"
    offer     = "UbuntuServer"
    sku       = "16.04.0-LTS"
    version   = "latest"
  }

  os_profile {
    computer_name  = "vm1234"
    admin_username = "<REDACTED>"
    admin_password = "<REDACTED>"
  }

  os_profile_linux_config {
    disable_password_authentication = false
  }

  storage_data_disk {
    name = "vm1234_data_disk_1"
    caching = "ReadWrite"
    lun = 0
    disk_size_gb = "32"
    create_option   = "Attach"
    managed_disk_id = azurerm_managed_disk.vm1234_data_disk_1.id
  }
}

Debug Output

...
2020-03-11T00:54:31.620-0700 [DEBUG] plugin.terraform-provider-azurerm_v1.44.0_x4: [DEBUG] Shutting Down Virtual Machine "vm1234" (Resource Group "rg")..
2020-03-11T00:54:31.620-0700 [DEBUG] plugin.terraform-provider-azurerm_v1.44.0_x4: [DEBUG] AzureRM Request: 
2020-03-11T00:54:31.620-0700 [DEBUG] plugin.terraform-provider-azurerm_v1.44.0_x4: POST /subscriptions/UUID/resourceGroups/rg/providers/Microsoft.Compute/virtualMachines/vm1234/powerOff?api-version=2019-07-01&skipShutdown=false HTTP/1.1
2020-03-11T00:54:31.620-0700 [DEBUG] plugin.terraform-provider-azurerm_v1.44.0_x4: Host: management.az
...

Expected Behavior

changing tags on a managed disk should not trigger VM reboot

Actual Behavior

VM is rebooted unexpectedly

Steps to Reproduce

1. terraform apply
2. uncomment tag2
3. terraform apply watch VM rebooting, inspect VM activity log

References

• seems to be introduced by Updated managed_disk resource for disk_size_gb updates #5579

[ghost]

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