Terraform Prevent Destroy - azure-virtual-machine

Question

I am working on creating multiple Azure VMs through terraform.
I earlier created 4 VMs with count variable successfully. Now I need to add additional 2 VMs. When I give the extra count of 2 VMs. It tries to destroy existing 4 Vms as well to create total VMs of 6. So I gave Prevent_destroy as true so that earlier 4 VMs will not be destroyed but new 2 VMs will be created. but with prevent_destroy also it gives error that Instance needs to be destroyed, this is not a desirable behavior as destroying existing 4 VMs is not expected as users are working on them I just need 2 new VMs using same script.

Answer 1

I tried using terraform-azurerm latest provider version v2.93.0 with latest terraform version v0.1.13 with the below code and it works as expected :
I tested it by creating 2 vm's first and then added another one by changing the count value as 3 .
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 = 3
name = "vm-public-ip${count.index}"
location = data.azurerm_resource_group.example.location
resource_group_name = data.azurerm_resource_group.example.name
allocation_method = "Dynamic"
}
resource "azurerm_network_interface" "example" {
count = 3
name = "example-nic-${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 = "${element(azurerm_public_ip.example.*.id, count.index)}"
private_ip_address_allocation = "Dynamic"
}
}
resource "azurerm_ssh_public_key" "example" {
name = "ansuman-sshkey"
resource_group_name = data.azurerm_resource_group.example.name
location = data.azurerm_resource_group.example.location
public_key = file("~/.ssh/id_rsa.pub")
}
resource "azurerm_linux_virtual_machine" "example" {
count = 3
name = "example-machine-${count.index}"
resource_group_name = data.azurerm_resource_group.example.name
location = data.azurerm_resource_group.example.location
size = "Standard_F2"
admin_username = "adminuser"
admin_password = "Password#1234"
disable_password_authentication = true
network_interface_ids = ["${element(azurerm_network_interface.example.*.id, count.index)}"]
admin_ssh_key {
username = "adminuser"
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:
After changing count from 2 to 3: