Terraform conditional help argument to public_ip_adress_id Azure

[Don Ky]

Hello all,

I'm struggling on how to make the parameter public_ip_adress_id optional using the azurerm_network_interface resource. 

In my original code block:

ip_configuration {

    name                          = "vm-ip"

    subnet_id                     = "${data.terraform_remote_state.vnet.external_subnet_id}"

    private_ip_address_allocation = "dynamic"

    public_ip_adress_id           = "${azurerm_public_ip.test.id}"

}

Works fine as it associates it to my public_ip resource. 

Now I want to make this parameter optional. Since on internal machines we don't need to assign public ip addresses so I'm using a variable with a bool to enable or disable creation of the public ip address. The issue is then how do we make this parameter optional? 

I've tried the following with no avail and have been struggling for a bit researching how this could work:

ip_configuration {

    name                          = "vm-ip"

    subnet_id                     = "${data.terraform_remote_state.vnet.external_subnet_id}"

    private_ip_address_allocation = "dynamic"

    public_ip_adress_id           = "${var.enable_public_ip == true ? azure_public_ip.test.id : list() }"

}

Any pointers would be useful.

Thanks 

[Haydn Dufrene]

not totally familiar with the use case, but when i have desired to have different setups per environment, i have done this by resource count, and looks like this has become suggested practice. (https://www.terraform.io/docs/state/environments.html#current-environment-interpolation) it could be a little cumbersome to copy configs across larger resources but unaware of a better option

you could try using the tertiary operator in count with a variable to see if you have better success.. i just did a quick little test and looks like it should work.

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