How can I update ip_configuration of an azurerm_network_interface to add azurerm_public_ip?

Question

I have created an HDInsight cluster with kafka using azurerm_hdinsight_kafka_cluster on a VNet (azurerm_virtual_network) with terraform. Due to which I get instances of Azure's network interface created implicitly by Azure Management Service.

I have also created azurerm_public_ip resources which I intend to associate with the network interfaces which are created implicitly as mentioned above.

This means, I need to update the implicitly created azurerm_network_interface resource with the azurerm_public_ip IP address via public_ip_address_id attribute.

I searched online for any documentation on updating the ip_configuration nested attribute of azurerm_network_interface (created implicitly), but unfortunately, did not find any.

Could anyone help me on this? I have not found any other resource in azurerm as well which might help me achieve this.

I would appreciate if someone could point me to an azurerm resource by which i can associate this or any other way possible.

Thanks in advance :)

How can I update ip_configuration of an azurerm_network_interface to add azurerm_public_ip?

Answer 1

I probably found a solution:

Using a null_resource from terraform for execute a local_exec with an Azure CLI command should do the trick.

Note: Make sure the local system has azure cli installed as prequisite.

e.g.:

resource "null_resource" "foo" {
  count = 3

  provisioner "local-exec" {
    command = <<EOT
      az --service-principal -u <USERNAME> -p '<PASSWORD>' --tenant <TENANT-ID>
      az network nic ip-config update --resource-group ${azurerm_resource_group.foo.name} --name ${azurerm_network_interface.foo[count.index].ip_configuration[0].name} --nic-name ${azurerm_network_interface.foo[count.index].name} --public-ip-address ${azurerm_public_ip.foo[count.index].id}
    EOT
  }
}

The command can be referred from the Azure documentation here.