Cannot set "zero" value to azurerm_availability_set ID for a VM

[bigmyx]

Terraform Version

Terraform v0.11.1
+ provider.azurerm v1.0.0
+ provider.external v1.0.0
+ provider.null v1.0.0
+ provider.template v1.0.0

Terraform Configuration Files

resource "azurerm_availability_set" "ls-consumer-availset" {
  count               = "${var.service["num_consumer"] >= 2 ? 1 : 0}"
  name                = "${var.resource_group_name}-ls-consumer-${var.role}-availset"
  location            = "${var.azure_location}"
  managed             = true
  resource_group_name = "${var.resource_group_name}"
  platform_fault_domain_count = 2
}

resource "azurerm_virtual_machine" "ls-consumer" {
  count                 = "${var.service["num_consumer"]}"
  name                  = "${var.resource_group_name}-ls-consumer-${var.role}-${count.index}"
  location              = "${var.azure_location}"
  resource_group_name   = "${var.resource_group_name}"
  network_interface_ids = ["${element(azurerm_network_interface.ls-consumer.*.id, count.index)}"]
  availability_set_id   = "${azurerm_availability_set.ls-consumer-availset.count == 1 ? azurerm_availability_set.ls-consumer-availset.id : "" }"
  vm_size               = "${var.service["vm_type"]}"
  delete_os_disk_on_termination    = true
  delete_data_disks_on_termination = true
  storage_os_disk {
    name              = "${var.resource_group_name}-ls-consumer-${var.role}-${count.index}-disk"
    create_option     = "FromImage"
    managed_disk_type = "Standard_LRS"
  }
  storage_image_reference {
    publisher = "OpenLogic"
    offer     = "CentOS"
    sku       = "7.3"
    version   = "latest"
  }
  os_profile {
    computer_name  = "${var.resource_group_name}-ls-consumer-${var.role}-${count.index}"
    admin_username = "${var.params["ssh_user"]}"
  }
  os_profile_linux_config {
    disable_password_authentication = true
    ssh_keys {
      path = "/home/${var.params["ssh_user"]}/.ssh/authorized_keys"
      key_data = "${var.params["ssh_pub_key"]}"
    }
  }
}

Crash Output

...
module.logstash-ops.azurerm_virtual_machine.ls-consumer: Resource 'azurerm_availability_set.ls-consumer-availset' not found for variable 'azurerm_availability_set.ls-consumer-availset.id'
...

References

• How to set undefined value #5471

[bigmyx]

seems like it did not work because VM was created before the availability set.. so putting depends_on constraint for VM resource solved the issue for me.

[rahulkp220]

@bigmyx Can you please paste the solution here? Or answer https://stackoverflow.com/questions/48306089/how-do-i-make-a-field-optional-inside-a-terraform-resource. I am facing the same issue.

[ghost]

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