How to set default values for a object in terraform? - terraform

Question

My terraform snippet:
variable "machine_details" {
type = object({
name = string
size = string
username = string
password = string
})
default = [
{
name = "example-vm"
size = "Standard_F2"
username = "adminuser"
password = "Notallowed1!"
}
]
}
I am getting error as below.
Error: Invalid default value for variable
│
│ on variables.tf line 38, in variable "machine_details":
│ 38: default = [
│ 39: {
│ 40: name = "example-vm"
│ 41: size = "Standard_F2"
│ 42: username = "adminuser"
│ 43: password = "Notallowed1!"
│ 44: }
│ 45: ]
This default value is not compatible with the variable's type constraint: object required.
I tried map(string) but didn't work too.
similary list(string) also.
I am trying the latest azurerm provider.
Also, in the gcp, we have option to provide count(for instances), so if I provide 2, two instances will be created.
How to do the same with azure and aws?
How to resolve this?

Answer 1

it is working this way.
variable "machine_details" {
type = object({
name = string
size = string
username = string
password = string
})
default = {
name = "example-vm"
size = "Standard_F2"
username = "adminuser"
password = "Notallowed1!"
}
}
And can refer like this : var.machine_details.name

Answer 2

As Marko E and luk2302 have mentioned , You have to declare and pass the variable as below :
variable "machine_details" {
type = list(object({
name = string
size = string
username = string
password = string
}))
default = [
{
name = "example-vm"
size = "Standard_F2"
username = "adminuser"
password = "Notallowed1!"
},
{
name = "example2-vm"
size = "Standard_F2"
username = "adminuser1"
password = "Notallowed2!"
}
]
}
So that if you want to use count then you can use something like below :
provider "azurerm" {
features{}
}
data "azurerm_resource_group" "example" {
name = "ansumantest"
}
resource "azurerm_virtual_network" "example" {
name = "example-network"
address_space = ["10.0.0.0/16"]
location = data.azurerm_resource_group.example.location
resource_group_name = data.azurerm_resource_group.example.name
}
resource "azurerm_subnet" "example" {
name = "internal"
resource_group_name = data.azurerm_resource_group.example.name
virtual_network_name = azurerm_virtual_network.example.name
address_prefixes = ["10.0.2.0/24"]
}
resource "azurerm_public_ip" "example" {
count = length(var.machine_details)
name = "aks-nfs-public-ip${count.index}"
location = data.azurerm_resource_group.example.location
resource_group_name = data.azurerm_resource_group.example.name
allocation_method = "Dynamic"
tags = {
environment = "Production"
}
}
resource "azurerm_network_interface" "example" {
count = length(var.machine_details)
name = "example-nic-${count.index}"
location = data.azurerm_resource_group.example.location
resource_group_name = data.azurerm_resource_group.example.name
ip_configuration {
name = "internal"
subnet_id = azurerm_subnet.example.id
public_ip_address_id = "${element(azurerm_public_ip.example.*.id, count.index)}"
private_ip_address_allocation = "Dynamic"
}
}
resource "azurerm_ssh_public_key" "example" {
name = "ansuman-sshkey"
resource_group_name = data.azurerm_resource_group.example.name
location = data.azurerm_resource_group.example.location
public_key = file("~/.ssh/id_rsa.pub")
}
resource "azurerm_linux_virtual_machine" "example" {
count = length(var.machine_details)
name = var.machine_details[count.index].name
resource_group_name = data.azurerm_resource_group.example.name
location = data.azurerm_resource_group.example.location
size = var.machine_details[count.index].size
admin_username = var.machine_details[count.index].username
admin_password = var.machine_details[count.index].password
disable_password_authentication = true
network_interface_ids = ["${element(azurerm_network_interface.example.*.id, count.index)}"]
admin_ssh_key {
username = var.machine_details[count.index].username
public_key = azurerm_ssh_public_key.example.public_key
}
os_disk {
caching = "ReadWrite"
storage_account_type = "Standard_LRS"
}
source_image_reference {
publisher = "Canonical"
offer = "UbuntuServer"
sku = "16.04-LTS"
version = "latest"
}
}
Output: