Need to create multile vms in azure through terraform

Question

I'm facing issues during creation of multiple VMs in Azure with Terraform. Each time it is failing because it is picking the same network-interface-id. So how can I change my Terraform code to make this use the different network interfaces?

Here is my Terraform file:

variable "node_count" {default = 2} 

resource "azurerm_network_interface" "terraform-CnetFace" {
  name = "cacctni-${format("%02d", count.index+1)}"
  location = "East US 2"
  resource_group_name = "${azurerm_resource_group.terraform-test.name}"

  ip_configuration {
      name = "cIpconfig-${format("%02d", count.index+1)}"
      subnet_id = "${azurerm_subnet.terraform-test.id}"
      private_ip_address_allocation = "dynamic"
  }
  count = "${var.node_count}"
}

variable "confignode_count" {default = 2} 

resource "azurerm_virtual_machine" "terraform-test" {
  name   = "confignode-${format("%02d", count.index+1)}"
  location = "East US 2"
  resource_group_name = "${azurerm_resource_group.terraform-test.name}"
  network_interface_ids = ["${azurerm_network_interface.terraform-CnetFace.id}"]
  vm_size = "Standard_A0"
  availability_set_id = "${azurerm_availability_set.terraform-test.id}"

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

  storage_os_disk {
      name = "configosdisk-${format("%02d", count.index+1)}"
      vhd_uri = "${azurerm_storage_account.terraform-test.primary_blob_endpoint}${azurerm_storage_container.terraform-test.name}/configosdisk-${format("%02d", count.index+1)}.vhd"
      caching = "ReadWrite"
      create_option = "FromImage"
  }

  storage_data_disk {
  name          = "configdatadisk-${format("%02d", count.index+1)}"
  vhd_uri       = "${azurerm_storage_account.terraform-test.primary_blob_endpoint}${azurerm_storage_container.terraform-test.name}/configdatadisk-${format("%02d", count.index+1)}.vhd"
  disk_size_gb  = "512"
  create_option = "empty"
  lun           = 0
  }

  os_profile {
      computer_name = "confignode-${format("%02d", count.index+1)}"
      admin_username = "ubuntu"
      admin_password = "Qawzsx12345"
  }

  os_profile_linux_config {
      disable_password_authentication = false
  }

  tags {
      environment = "Production"
  }
  provisioner "local-exec" {
      command = "sleep 30"
  }

  #Loop for Count
  count = "${var.confignode_count}"
}

Glorfindel · Accepted Answer · 2022-03-01 09:03:12Z

5

If you're trying to link two resources as you loop through them then you need to use "splats" to retrieve the list of resources created in a loop and select the right one. This is explained briefly in the interpolation syntax docs and the resources docs.

In your case you probably want something like:

variable "count" {default = 2} 

resource "azurerm_network_interface" "terraform-CnetFace" {
  count = "${var.count}"
  ...
}

resource "azurerm_virtual_machine" "terraform-test" {
  count = "${var.count}"
  ...
  network_interface_ids = ["${element(azurerm_network_interface.terraform-CnetFace.*.id, count.index)}"]
  ...
}

This exposes the outputs for each of the looped network interfaces created and then loops through them grabbing the id from the output and passing it to the appropriate azurerm_virtual_machine.

edited Mar 1, 2022 at 9:03

Glorfindel

22.8k13 gold badges97 silver badges124 bronze badges

answered Nov 11, 2016 at 13:37

ydaetskcoR

57.4k8 gold badges173 silver badges190 bronze badges

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