Terraform public ip output on Azure - azure

Question

I am following the example [1] to output the public IP of a new VM created on Azure with Terraform. It works fine when creating only 1 VM, but when I add a counter (default 2), it doesn't output anything.
This is how I am modifying the .tf file:
variable "count" {
default = "2"
}
...
resource "azurerm_public_ip" "test" {
name = "test-pip"
location = "${azurerm_resource_group.test.location}"
resource_group_name = "${azurerm_resource_group.test.name}"
public_ip_address_allocation = "Dynamic"
idle_timeout_in_minutes = 30
tags {
environment = "test"
}
}
...
data "azurerm_public_ip" "test" {
count = "${var.count}"
name = "${element(azurerm_public_ip.test.*.name, count.index)}"
resource_group_name = "${azurerm_virtual_machine.test.resource_group_name}"
}
output "public_ip_address" {
value = "${data.azurerm_public_ip.test.*.ip_address}"
}
After terraform apply:
Outputs:
public_ip_address = [
,
]
[1] https://www.terraform.io/docs/providers/azurerm/d/public_ip.html

Answer 1

The reason that you cannot output the multi public IPs is that you do not create multi public IPs. So when you use ${data.azurerm_public_ip.test.*.ip_address} to output them, there no these resources for you.
For the terraform, you could add the count in the resource azurerm_public_ip to create multi public IPs and output them with azurerm_public_ip.test.*.ip_address like this:
variable "count" {
default = "2"
}
...
resource "azurerm_public_ip" "test" {
count = "${var.count}"
name = "test-${count.index}-pip"
location = "${azurerm_resource_group.test.location}"
resource_group_name = "${azurerm_resource_group.test.name}"
public_ip_address_allocation = "Static"
idle_timeout_in_minutes = 30
tags {
environment = "test-${count.index}"
}
}
...
output "public_ip_address" {
value = "${azurerm_public_ip.test.*.ip_address}"
}
The screenshot of the result like this:
I did the test just create the public. So I change the allocation method into Static and output it with the resource.
If you want to use the data to reference the public IPs. The code would like this:
data "azurerm_public_ip" "test" {
count = "${var.count}"
name = "${element(azurerm_public_ip.test.*.name, count.index)}"
resource_group_name = "${azurerm_resource_group.test.name}"
}
output "public_ip_address" {
value = "${data.azurerm_public_ip.test.*.ip_address}"
}
Hope this will help you. If you need more help please let me know.

Answer 2

So I just ran into the exact same problem with my deployment into Azure.
The above solutions worked( Charles Xu's solution), with one caveat... I had to:
hard-code the name of the resource group,
as well as add a depends on clause to the output block.
I am sure that the above answers are the correct way to go about it however the value of the resource group key in the data object "azurerm_public_ip" needed to be hardcoded...