Azure Official Example fails when augmenting it with a count logic to support VM scaling.

[hashibot]

This issue was originally opened by @djsly as hashicorp/terraform#11821. It was migrated here as part of the provider split. The original body of the issue is below.

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Hello,

I took the Azure example and added a count parameter to the objects that needed them. when I increase the count from 1 to 2, I get an error with the creation of the second VM. Terraform will try to recreate the VM.0 and this fails with a disk error.

Terraform Version

Terraform v0.8.6

Affected Resource(s)

• azurerm_virtual_machine
• azurerm_storage_container
• azurerm_storage_account

Possibly a core issue since it looks similar as : hashicorp/terraform#3449

Terraform Configuration Files

variable "counts" {}

provider "azurerm" {
  subscription_id = "<removed>"
  client_id       = "<removed>"
  client_secret   = "<removed>"
  tenant_id       = "<removed>"
}

resource "azurerm_resource_group" "test" {
    name = "acctestrg"
    location = "West US"
}

resource "azurerm_virtual_network" "test" {
    name = "acctvn"
    address_space = ["10.0.0.0/16"]
    location = "West US"
    resource_group_name = "${azurerm_resource_group.test.name}"
}

resource "azurerm_subnet" "test" {
    name = "acctsub"
    resource_group_name = "${azurerm_resource_group.test.name}"
    virtual_network_name = "${azurerm_virtual_network.test.name}"
    address_prefix = "10.0.2.0/24"
}

resource "azurerm_network_interface" "test" {
    count = "${var.counts}"
    name = "acctni${count.index}"
    location = "West US"
    resource_group_name = "${azurerm_resource_group.test.name}"

    ip_configuration {
        name = "testconfiguration1"
        subnet_id = "${azurerm_subnet.test.id}"
        private_ip_address_allocation = "dynamic"
    }
}

resource "azurerm_storage_account" "test" {
    count = "${var.counts}"
    name = "accsai${count.index}"
    resource_group_name = "${azurerm_resource_group.test.name}"
    location = "westus"
    account_type = "Standard_LRS"

    tags {
        environment = "staging"
    }
}

resource "azurerm_storage_container" "test" {
    count = "${var.counts}"
    name = "vhds"
    resource_group_name = "${azurerm_resource_group.test.name}"
    storage_account_name = "${azurerm_storage_account.test.*.name[count.index]}"
    container_access_type = "private"
}

resource "azurerm_virtual_machine" "test" {
    count = "${var.counts}"
    name = "acctvm${count.index}"
    location = "West US"
    resource_group_name = "${azurerm_resource_group.test.name}"
    network_interface_ids = ["${azurerm_network_interface.test.*.id[count.index]}"]
    vm_size = "Standard_A0"

    storage_image_reference {
        publisher = "Canonical"
        offer = "UbuntuServer"
        sku = "14.04.2-LTS"
        version = "latest"
    }

    storage_os_disk {
        name = "myosdisk1"
        vhd_uri = "${azurerm_storage_account.test.*.primary_blob_endpoint[count.index]}${azurerm_storage_container.test.*.name[count.index]}/myosdisk1.vhd"
        caching = "ReadWrite"
        create_option = "FromImage"
    }

    os_profile {
        computer_name = "hostname${count.index}"
        admin_username = "testadmin"
        admin_password = "Password1234!"
    }

    os_profile_linux_config {
        disable_password_authentication = false
    }

    tags {
        environment = "staging"
    }
}

Debug Output

The terraform plan output
https://gist.github.com/djsly/639fc1b039db89fce5bcafe3fc53a165
The terraform apply output
https://gist.github.com/djsly/eaf7e1e3786915dd2a7e285db0f0b7c0

Expected Behavior

We should be getting only new resources while having the existing resources untouched.

Actual Behavior

The VM0 object gets recreated and fails while trying to recreate the osdisk0 since it already exists.

Steps to Reproduce

Please list the steps required to reproduce the issue, for example:

1. TF_VAR_count=1 terraform plan apply
2. TF_VAR_count=2 terraform plan apply

References

Could be related to (unsure)

• Azure virtual machine extension timeout and create empty extension #3449

[tombuildsstuff]

Closing as I've replied on the original issue

[ghost]

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