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Quickstart: Direct web traffic using PowerShell
Azure Application Gateway
Learn how to use Azure PowerShell to create an Azure Application Gateway that directs web traffic to virtual machines in a backend pool.
application-gateway
vhorne
application-gateway
quickstart
04/15/2020
victorh
mvc

Quickstart: Direct web traffic with Azure Application Gateway using Azure PowerShell

In this quickstart, you use Azure PowerShell to create an application gateway. Then you test it to make sure it works correctly.

The application gateway directs application web traffic to specific resources in a backend pool. You assign listeners to ports, create rules, and add resources to a backend pool. For the sake of simplicity, this article uses a simple setup with a public front-end IP, a basic listener to host a single site on the application gateway, a basic request routing rule, and two virtual machines in the backend pool.

You can also complete this quickstart using Azure CLI or the Azure portal.

[!INCLUDE cloud-shell-try-it.md]

[!INCLUDE updated-for-az]

Prerequisites

Connect to Azure

To connect with Azure, run Connect-AzAccount.

Create a resource group

In Azure, you allocate related resources to a resource group. You can either use an existing resource group or create a new one.

To create a new resource group, use the New-AzResourceGroup cmdlet:

New-AzResourceGroup -Name myResourceGroupAG -Location eastus

Create network resources

For Azure to communicate between the resources that you create, it needs a virtual network. The application gateway subnet can contain only application gateways. No other resources are allowed. You can either create a new subnet for Application Gateway or use an existing one. In this example, you create two subnets in this example: one for the application gateway, and another for the backend servers. You can configure the Frontend IP of the Application Gateway to be Public or Private as per your use case. In this example, you'll choose a Public Frontend IP.

  1. Create the subnet configurations using New-AzVirtualNetworkSubnetConfig.
  2. Create the virtual network with the subnet configurations using New-AzVirtualNetwork.
  3. Create the public IP address using New-AzPublicIpAddress.
$agSubnetConfig = New-AzVirtualNetworkSubnetConfig `
  -Name myAGSubnet `
  -AddressPrefix 10.0.1.0/24
$backendSubnetConfig = New-AzVirtualNetworkSubnetConfig `
  -Name myBackendSubnet `
  -AddressPrefix 10.0.2.0/24
New-AzVirtualNetwork `
  -ResourceGroupName myResourceGroupAG `
  -Location eastus `
  -Name myVNet `
  -AddressPrefix 10.0.0.0/16 `
  -Subnet $agSubnetConfig, $backendSubnetConfig
New-AzPublicIpAddress `
  -ResourceGroupName myResourceGroupAG `
  -Location eastus `
  -Name myAGPublicIPAddress `
  -AllocationMethod Static `
  -Sku Standard

Create an application gateway

Create the IP configurations and frontend port

  1. Use New-AzApplicationGatewayIPConfiguration to create the configuration that associates the subnet you created with the application gateway.
  2. Use New-AzApplicationGatewayFrontendIPConfig to create the configuration that assigns the public IP address that you previously created to the application gateway.
  3. Use New-AzApplicationGatewayFrontendPort to assign port 80 to access the application gateway.
$vnet   = Get-AzVirtualNetwork -ResourceGroupName myResourceGroupAG -Name myVNet
$subnet = Get-AzVirtualNetworkSubnetConfig -VirtualNetwork $vnet -Name myAGSubnet
$pip    = Get-AzPublicIPAddress -ResourceGroupName myResourceGroupAG -Name myAGPublicIPAddress 
$gipconfig = New-AzApplicationGatewayIPConfiguration `
  -Name myAGIPConfig `
  -Subnet $subnet
$fipconfig = New-AzApplicationGatewayFrontendIPConfig `
  -Name myAGFrontendIPConfig `
  -PublicIPAddress $pip
$frontendport = New-AzApplicationGatewayFrontendPort `
  -Name myFrontendPort `
  -Port 80

Create the backend pool

  1. Use New-AzApplicationGatewayBackendAddressPool to create the backend pool for the application gateway. The backend pool will be empty for now. When you create the backend server NICs in the next section, you will add them to the backend pool.
  2. Configure the settings for the backend pool with New-AzApplicationGatewayBackendHttpSetting.
$backendPool = New-AzApplicationGatewayBackendAddressPool `
  -Name myAGBackendPool
$poolSettings = New-AzApplicationGatewayBackendHttpSetting `
  -Name myPoolSettings `
  -Port 80 `
  -Protocol Http `
  -CookieBasedAffinity Enabled `
  -RequestTimeout 30

Create the listener and add a rule

Azure requires a listener to enable the application gateway for routing traffic appropriately to the backend pool. Azure also requires a rule for the listener to know which backend pool to use for incoming traffic.

  1. Create a listener using New-AzApplicationGatewayHttpListener with the frontend configuration and frontend port that you previously created.
  2. Use New-AzApplicationGatewayRequestRoutingRule to create a rule named rule1.
$defaultlistener = New-AzApplicationGatewayHttpListener `
  -Name myAGListener `
  -Protocol Http `
  -FrontendIPConfiguration $fipconfig `
  -FrontendPort $frontendport
$frontendRule = New-AzApplicationGatewayRequestRoutingRule `
  -Name rule1 `
  -RuleType Basic `
  -HttpListener $defaultlistener `
  -BackendAddressPool $backendPool `
  -BackendHttpSettings $poolSettings

Create the application gateway

Now that you've created the necessary supporting resources, create the application gateway:

  1. Use New-AzApplicationGatewaySku to specify parameters for the application gateway.
  2. Use New-AzApplicationGateway to create the application gateway.
$sku = New-AzApplicationGatewaySku `
  -Name Standard_v2 `
  -Tier Standard_v2 `
  -Capacity 2
New-AzApplicationGateway `
  -Name myAppGateway `
  -ResourceGroupName myResourceGroupAG `
  -Location eastus `
  -BackendAddressPools $backendPool `
  -BackendHttpSettingsCollection $poolSettings `
  -FrontendIpConfigurations $fipconfig `
  -GatewayIpConfigurations $gipconfig `
  -FrontendPorts $frontendport `
  -HttpListeners $defaultlistener `
  -RequestRoutingRules $frontendRule `
  -Sku $sku

Backend servers

Now that you have created the Application Gateway, create the backend virtual machines which will host the websites. Backend can be composed of NICs, virtual machine scale sets, public IPs, internal IPs, fully qualified domain names (FQDN), and multi-tenant back-ends like Azure App Service. In this example, you create two virtual machines for Azure to use as backend servers for the application gateway. You also install IIS on the virtual machines to verify that Azure successfully created the application gateway.

Create two virtual machines

  1. Get the recently created Application Gateway backend pool configuration with Get-AzApplicationGatewayBackendAddressPool.
  2. Create a network interface with New-AzNetworkInterface.
  3. Create a virtual machine configuration with New-AzVMConfig.
  4. Create the virtual machine with New-AzVM.

When you run the following code sample to create the virtual machines, Azure prompts you for credentials. Enter azureuser for the user name and a password: ​

$appgw = Get-AzApplicationGateway -ResourceGroupName myResourceGroupAG -Name myAppGateway
$backendPool = Get-AzApplicationGatewayBackendAddressPool -Name myAGBackendPool -ApplicationGateway $appgw
$vnet   = Get-AzVirtualNetwork -ResourceGroupName myResourceGroupAG -Name myVNet
$subnet = Get-AzVirtualNetworkSubnetConfig -VirtualNetwork $vnet -Name myBackendSubnet
$cred = Get-Credential
for ($i=1; $i -le 2; $i++)
{
  $nic = New-AzNetworkInterface `
    -Name myNic$i `
    -ResourceGroupName myResourceGroupAG `
    -Location EastUS `
    -Subnet $subnet `
    -ApplicationGatewayBackendAddressPool $backendpool
  $vm = New-AzVMConfig `
    -VMName myVM$i `
    -VMSize Standard_DS2_v2
  Set-AzVMOperatingSystem `
    -VM $vm `
    -Windows `
    -ComputerName myVM$i `
    -Credential $cred
  Set-AzVMSourceImage `
    -VM $vm `
    -PublisherName MicrosoftWindowsServer `
    -Offer WindowsServer `
    -Skus 2016-Datacenter `
    -Version latest
  Add-AzVMNetworkInterface `
    -VM $vm `
    -Id $nic.Id
  Set-AzVMBootDiagnostic `
    -VM $vm `
    -Disable
  New-AzVM -ResourceGroupName myResourceGroupAG -Location EastUS -VM $vm
  Set-AzVMExtension `
    -ResourceGroupName myResourceGroupAG `
    -ExtensionName IIS `
    -VMName myVM$i `
    -Publisher Microsoft.Compute `
    -ExtensionType CustomScriptExtension `
    -TypeHandlerVersion 1.4 `
    -SettingString '{"commandToExecute":"powershell Add-WindowsFeature Web-Server; powershell Add-Content -Path \"C:\\inetpub\\wwwroot\\Default.htm\" -Value $($env:computername)"}' `
    -Location EastUS
}

Test the application gateway

Although IIS isn't required to create the application gateway, you installed it in this quickstart to verify whether Azure successfully created the application gateway. Use IIS to test the application gateway:

  1. Run Get-AzPublicIPAddress to get the public IP address of the application gateway.
  2. Copy and paste the public IP address into the address bar of your browser. When you refresh the browser, you should see the name of the virtual machine. A valid response verifies that the application gateway was successfully created and it can successfully connect with the backend.
Get-AzPublicIPAddress -ResourceGroupName myResourceGroupAG -Name myAGPublicIPAddress

Test application gateway

Clean up resources

When you no longer need the resources that you created with the application gateway, delete the resource group. When you delete the resource group, you also delete the application gateway and all its related resources.

To delete the resource group, call the Remove-AzResourceGroup cmdlet:

Remove-AzResourceGroup -Name myResourceGroupAG

Next steps

[!div class="nextstepaction"] Manage web traffic with an application gateway using Azure PowerShell