Associated load balancer remediation

Using Console

To remediate the misconfiguration of VM Scale Sets not being integrated with Load Balancers in AZURE, follow the below steps:

Login to the AZURE portal (https://portal.azure.com/).
Navigate to the “Virtual machine scale sets” option in the left-hand menu.
Select the VM scale set that you want to integrate with a load balancer.
Click on the “Networking” option under the “Settings” section.
In the “Networking” section, click on the “Add inbound NAT rule” option.
In the “Add inbound NAT rule” window, select the “Load balancer” option.
Select the load balancer that you want to integrate with the VM scale set.
Select the backend port and protocol for the VM instances.
Select the frontend IP configuration for the load balancer.
Click on the “Add” button to save the changes.

After following these steps, the VM scale set will be integrated with the selected load balancer.

Using CLI

To remediate the misconfiguration of VM Scale Sets not being integrated with Load Balancers in AZURE, you can follow the below steps using AZURE CLI:

First, you need to create a Load Balancer using the following command:
az network lb create --name <load_balancer_name> --resource-group <resource_group_name> --location <location>
Replace the <load_balancer_name>, <resource_group_name>, and <location> placeholders with the appropriate values.
Next, you need to create a backend pool for the VM Scale Set using the following command:
az network lb address-pool create --name <backend_pool_name> --lb-name <load_balancer_name> --resource-group <resource_group_name>
Replace the <backend_pool_name>, <load_balancer_name>, and <resource_group_name> placeholders with the appropriate values.
Now, you need to add the VM Scale Set instances to the backend pool using the following command:
az network nic ip-config address-pool add --address-pool <backend_pool_name> --ip-config-name ipconfig1 --nic-name <nic_name> --resource-group <resource_group_name>
Replace the <backend_pool_name>, <nic_name>, and <resource_group_name> placeholders with the appropriate values.

Finally, you need to configure the VM Scale Set to use the Load Balancer by updating the Load Balancer ID in the VM Scale Set configuration using the following command:

az vmss update --name <vmss_name> --resource-group <resource_group_name> --set virtualMachineProfile.networkProfile.networkInterfaceConfigurations[0].ipConfigurations[0].loadBalancerBackendAddressPools=[{'id':'/subscriptions/<subscription_id>/resourceGroups/<resource_group_name>/providers/Microsoft.Network/loadBalancers/<load_balancer_name>/backendAddressPools/<backend_pool_name>'}]

Replace the <vmss_name>, <resource_group_name>, <subscription_id>, <load_balancer_name>, and <backend_pool_name> placeholders with the appropriate values.

After following these steps, your VM Scale Set will be integrated with the Load Balancer in AZURE.

Using Python

To remediate the misconfiguration “VM Scale Sets Should Be Integrated With Load Balancers” for Azure using Python, you can follow the below steps:Step 1: Import the required modules and authenticate to Azure using the Python SDK.

from azure.identity import AzureCliCredential
from azure.mgmt.compute import ComputeManagementClient
from azure.mgmt.network import NetworkManagementClient

credential = AzureCliCredential()
compute_client = ComputeManagementClient(credential, subscription_id)
network_client = NetworkManagementClient(credential, subscription_id)

Step 2: Get the list of VM Scale Sets that are not integrated with Load Balancers.

vmss_list = compute_client.virtual_machine_scale_sets.list()

for vmss in vmss_list:
    if vmss.sku.capacity > 0:
        lb = network_client.load_balancers.list()
        if lb:
            for lb in lb:
                if lb.backend_address_pools:
                    for pool in lb.backend_address_pools:
                        if pool.virtual_machine_scale_set:
                            if pool.virtual_machine_scale_set.id == vmss.id:
                                break
                    else:
                        network_client.load_balancers.create_or_update(
                            resource_group_name=resource_group_name,
                            load_balancer_name=load_balancer_name,
                            parameters={
                                "location": location,
                                "frontend_ip_configurations": [{
                                    "name": frontend_ip_configuration_name,
                                    "public_ip_address": {
                                        "id": public_ip_address_id
                                    }
                                }],
                                "backend_address_pools": [{
                                    "name": backend_address_pool_name,
                                    "virtual_machine_scale_set": {
                                        "id": vmss.id
                                    }
                                }]
                            }
                        )

Step 3: If a VM Scale Set is not integrated with a Load Balancer, create a new Load Balancer and integrate it with the VM Scale Set.

network_client.load_balancers.create_or_update(
    resource_group_name=resource_group_name,
    load_balancer_name=load_balancer_name,
    parameters={
        "location": location,
        "frontend_ip_configurations": [{
            "name": frontend_ip_configuration_name,
            "public_ip_address": {
                "id": public_ip_address_id
            }
        }],
        "backend_address_pools": [{
            "name": backend_address_pool_name,
            "virtual_machine_scale_set": {
                "id": vmss.id
            }
        }]
    }
)

By following these steps, you can remediate the misconfiguration “VM Scale Sets Should Be Integrated With Load Balancers” for Azure using Python.

Using Terraform

# Azure Load Balancer for the scale set
resource "azurerm_lb" "VMSS_LB" {
  name                = "VMSS-LB"
  location            = azurerm_resource_group.RG.location
  resource_group_name = azurerm_resource_group.RG.name
  sku                 = "Standard"

  frontend_ip_configuration {
    name                 = "PublicFrontEnd"
    public_ip_address_id = azurerm_public_ip.VMSS_LB_PIP.id
  }
}

resource "azurerm_public_ip" "VMSS_LB_PIP" {
  name                = "VMSS-LB-PIP"
  location            = azurerm_resource_group.RG.location
  resource_group_name = azurerm_resource_group.RG.name
  allocation_method   = "Static"
  sku                 = "Standard"
}

resource "azurerm_lb_backend_address_pool" "VMSS_BEP" {
  name            = "VMSS-BackendPool"
  loadbalancer_id = azurerm_lb.VMSS_LB.id
}

# Optional: health probe and LB rule (typical HTTP example)
resource "azurerm_lb_probe" "VMSS_PROBE" {
  name                = "http-probe"
  resource_group_name = azurerm_resource_group.RG.name
  loadbalancer_id     = azurerm_lb.VMSS_LB.id
  protocol            = "Tcp"
  port                = 80
}

resource "azurerm_lb_rule" "VMSS_LB_RULE" {
  name                           = "http-rule"
  resource_group_name            = azurerm_resource_group.RG.name
  loadbalancer_id                = azurerm_lb.VMSS_LB.id
  protocol                       = "Tcp"
  frontend_port                  = 80
  backend_port                   = 80
  disable_outbound_snat          = true
  frontend_ip_configuration_name = "PublicFrontEnd"
  backend_address_pool_ids       = [azurerm_lb_backend_address_pool.VMSS_BEP.id]
  probe_id                       = azurerm_lb_probe.VMSS_PROBE.id
}

# VM Scale Set integrated with the Load Balancer
resource "azurerm_linux_virtual_machine_scale_set" "VMSS" {
  name                = "VMSS-NAME"
  location            = azurerm_resource_group.RG.location
  resource_group_name = azurerm_resource_group.RG.name
  sku                 = "Standard_DS1_v2"
  instances           = 2
  admin_username      = "ADMIN_USERNAME"
  admin_password      = "ADMIN_PASSWORD" # or use ssh_keys

  source_image_reference {
    publisher = "Canonical"
    offer     = "0001-com-ubuntu-server-focal"
    sku       = "20_04-lts"
    version   = "latest"
  }

  network_interface {
    name    = "vmss-nic"
    primary = true

    ip_configuration {
      name      = "internal"
      primary   = true
      subnet_id = azurerm_subnet.VMSS_SUBNET.id

      # This is the key setting that integrates the scale set with the LB
      load_balancer_backend_address_pool_ids = [
        azurerm_lb_backend_address_pool.VMSS_BEP.id
      ]
    }
  }

  os_disk {
    caching              = "ReadWrite"
    storage_account_type = "Standard_LRS"
  }
}

# Supporting network resources (replace placeholders)
resource "azurerm_resource_group" "RG" {
  name     = "RG_NAME"      # replace with your resource group name
  location = "REGION_NAME"  # replace with your Azure region
}

resource "azurerm_virtual_network" "VNET" {
  name                = "VNET-NAME"       # replace
  address_space       = ["10.0.0.0/16"]
  location            = azurerm_resource_group.RG.location
  resource_group_name = azurerm_resource_group.RG.name
}

resource "azurerm_subnet" "VMSS_SUBNET" {
  name                 = "VMSS-Subnet"
  resource_group_name  = azurerm_resource_group.RG.name
  virtual_network_name = azurerm_virtual_network.VNET.name
  address_prefixes     = ["10.0.1.0/24"]
}

Replace:

RG_NAME with your resource group name.
REGION_NAME with your Azure region.
VNET-NAME with your virtual network name.
ADMIN_USERNAME / ADMIN_PASSWORD with appropriate credentials or configure SSH keys instead.

This change does not force replacement of the scale set resource itself, but updating network_interface / ip_configuration causes rollout operations on the scale set instances (VMs may be recreated or reimaged during apply).To verify, terraform plan should show:

creation of azurerm_lb, azurerm_lb_backend_address_pool, and related resources, if new.
an update on azurerm_linux_virtual_machine_scale_set.VMSS adding load_balancer_backend_address_pool_ids under the NIC ip_configuration.

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