Attach an AKS Cluster to an existing VNET using Terraform - azure

Question

I am new to the DevOps and Terraform domain, and I would like to ask the following. I have already create a VNET (using portal) which called "myVNET" in the resource group "Networks". I am trying to implement a AKS cluster using Terraform. My main.tf file is below
provider "azurerm" {
subscription_id = var.subscription_id
client_id = var.client_id
client_secret = var.client_secret
tenant_id = var.tenant_id
features {}
}
resource "azurerm_resource_group" "MyPlatform" {
name = var.resourcename
location = var.location
}
resource "azurerm_kubernetes_cluster" "aks-cluster" {
name = var.clustername
location = azurerm_resource_group.MyPlatform.location
resource_group_name = azurerm_resource_group.MyPlatform.name
dns_prefix = var.dnspreffix
default_node_pool {
name = "default"
node_count = var.agentnode
vm_size = var.size
}
service_principal {
client_id = var.client_id
client_secret = var.client_secret
}
network_profile {
network_plugin = "azure"
load_balancer_sku = "standard"
network_policy = "calico"
}
}
My question is the following, how can I attach my cluster to my VNET?

Answer 1

You do that by assigning the subnet ID to the node pool vnet_subnet_id.
data "azurerm_subnet" "subnet" {
name = "<name of the subnet to run in>"
virtual_network_name = "MyVNET"
resource_group_name = "Networks"
}
...
resource "azurerm_kubernetes_cluster" "aks-cluster" {
...
default_node_pool {
name = "default"
...
vnet_subnet_id = data.azurerm_subnet.subnet.id
}
...
You can reference this existing module to build your own module if not use it directly.