Terraform - Azure: Attach Existing Disk - Changing property 'dataDisk.name' is not allowed

[akamalov]

Greetings,

Environment:

- Terraform v0.11.0
- provider.azurerm v0.3.3
- provider.tls v1.0.1
- RHEL 7.2
- Kernel: 3.10.0-327.4.4.el7.x86_64

Problem:

Trying to attach an existing disk on VM being provisioned on Azure, getting error as such:

* azurerm_virtual_machine.kafka_vm: compute.VirtualMachinesClient#CreateOrUpdate: Failure responding to request: StatusCode=409 -- Original Error: autorest/azure: Service returned an error. Status=409 Code="PropertyChangeNotAllowed" Message="Changing property 'dataDisk.name' is not allowed."

Here is vm.tf snippet:

storage_data_disk {
    name            = "${var.env_short_name}-kafka-data01"
    managed_disk_id = "${var.kafka_data_image_id}"
    create_option   = "Attach"
    disk_size_gb  = "30"
    lun             = 5
  }

..where managed_disk_id is a variable (i.e., $var.kafka_data_image_id) defined with a full path to the existing disk. Example:

kafka_data_image_id  = "/subscriptions/XXXXX-fcf3-4ec6-b598-XXXXXXXXXXXX/resourceGroups/TEST-Environment-test0001-rg/providers/Microsoft.Compute/disks/test1-kafka-data01"

I tried to provide ""for the name, but it errored out telling me that I must provide name. Any pointers on what am I doing wrong? Could it be that a problem is related to #85

Thanks!!

[akamalov]

Answering my own question: It looks like if disk_size_gb is provided wrong (i.e., existing disk_size_gb = 20, but provided in terraform plan the number is wrong - example 30 ), then Terraform errors out with this obscure message. The problem is not in disk name, but in disk size, however reported message references the name of the disk

[passionatedevops]

I was facing the same issue

Error: compute.VirtualMachinesClient#CreateOrUpdate: Failure sending request: StatusCode=0 -- 

Original Error: autorest/azure: Service returned an error. Status=<nil> Code="PropertyChangeNotAllowed" Message="Changing property 'dataDisk.createOption' is not allowed." Target="dataDisk.createOption"

  on modules/ApplicationServer/main.tf line 25, in resource "azurerm_virtual_machine" "main-rg__appvm":
  25: resource azurerm_virtual_machine main-rg__appvm {

I tried this and got solved.

storage_data_disk {
    name              = "datadisk-1"
    lun               = 1
    create_option     = "Attach"
    disk_size_gb      = "1023"
    managed_disk_type = "StandardSSD_LRS"
}

If you are already using create_option = "Attach", try this create_option = "Empty" under storage_data_disk section

[ghost]

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