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Create an application gateway with external redirection using Azure PowerShell

  • Article

You can use Azure PowerShell to configure web traffic redirection when you create an application gateway. In this tutorial, you configure a listener and rule that redirects web traffic that arrives at the application gateway to an external site.

In this article, you learn how to:

  • Set up the network
  • Create a listener and redirection rule
  • Create an application gateway

If you don't have an Azure subscription, create a free account before you begin.

Note

We recommend that you use the Azure Az PowerShell module to interact with Azure. To get started, see Install Azure PowerShell. To learn how to migrate to the Az PowerShell module, see Migrate Azure PowerShell from AzureRM to Az.

Azure Cloud Shell

Azure hosts Azure Cloud Shell, an interactive shell environment that you can use through your browser. You can use either Bash or PowerShell with Cloud Shell to work with Azure services. You can use the Cloud Shell preinstalled commands to run the code in this article, without having to install anything on your local environment.

To start Azure Cloud Shell:

Option Example/Link
Select Try It in the upper-right corner of a code or command block. Selecting Try It doesn't automatically copy the code or command to Cloud Shell. Screenshot that shows an example of Try It for Azure Cloud Shell.
Go to https://shell.azure.com, or select the Launch Cloud Shell button to open Cloud Shell in your browser. Button to launch Azure Cloud Shell.
Select the Cloud Shell button on the menu bar at the upper right in the Azure portal. Screenshot that shows the Cloud Shell button in the Azure portal

To use Azure Cloud Shell:

  1. Start Cloud Shell.

  2. Select the Copy button on a code block (or command block) to copy the code or command.

  3. Paste the code or command into the Cloud Shell session by selecting Ctrl+Shift+V on Windows and Linux, or by selecting Cmd+Shift+V on macOS.

  4. Select Enter to run the code or command.

If you choose to install and use the PowerShell locally, this tutorial requires the Azure PowerShell module version 1.0.0 or later. To find the version, run Get-Module -ListAvailable Az . If you need to upgrade, see Install Azure PowerShell module. If you're running PowerShell locally, you also need to run Login-AzAccount to create a connection with Azure.

Create a resource group

A resource group is a logical container into which Azure resources are deployed and managed. Create an Azure resource group using New-AzResourceGroup.

New-AzResourceGroup -Name myResourceGroupAG -Location eastus

Create network resources

Create the subnet configuration myAGSubnet using New-AzVirtualNetworkSubnetConfig. Create the virtual network named myVNet using New-AzVirtualNetwork with the subnet configuration. And finally, create the public IP address using New-AzPublicIpAddress. These resources are used to provide network connectivity to the application gateway and its associated resources.

$agSubnetConfig = New-AzVirtualNetworkSubnetConfig `
  -Name myAGSubnet `
  -AddressPrefix 10.0.1.0/24
$vnet = New-AzVirtualNetwork `
  -ResourceGroupName myResourceGroupAG `
  -Location eastus `
  -Name myVNet `
  -AddressPrefix 10.0.0.0/16 `
  -Subnet $agSubnetConfig
$pip = New-AzPublicIpAddress `
  -ResourceGroupName myResourceGroupAG `
  -Location eastus `
  -Name myAGPublicIPAddress `
  -AllocationMethod Dynamic

Create an application gateway

Create the IP configurations and frontend port

Associate myAGSubnet that you previously created to the application gateway using New-AzApplicationGatewayIPConfiguration. Assign the public IP address to the application gateway using New-AzApplicationGatewayFrontendIPConfig. And then you can create the HTTP port using New-AzApplicationGatewayFrontendPort.

$vnet = Get-AzVirtualNetwork `
  -ResourceGroupName myResourceGroupAG `
  -Name myVNet
$subnet=$vnet.Subnets[0]
$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 and settings

Create the backend pool named defaultPool for the application gateway using New-AzApplicationGatewayBackendAddressPool. Configure the settings for the pool using New-AzApplicationGatewayBackendHttpSettings.

$defaultPool = New-AzApplicationGatewayBackendAddressPool `
  -Name defaultPool 
$poolSettings = New-AzApplicationGatewayBackendHttpSettings `
  -Name myPoolSettings `
  -Port 80 `
  -Protocol Http `
  -CookieBasedAffinity Enabled `
  -RequestTimeout 120

Create the listener and rule

A listener is required to enable the application gateway to appropriately route traffic. Create the listener using New-AzApplicationGatewayHttpListener with the frontend configuration and frontend port that you previously created. A rule is required for the listener to know where to send incoming traffic. Create a basic rule named redirectRule using New-AzApplicationGatewayRequestRoutingRule.

$defaultListener = New-AzApplicationGatewayHttpListener `
  -Name defaultListener `
  -Protocol Http `
  -FrontendIPConfiguration $fipconfig `
  -FrontendPort $frontendport
$redirectConfig = New-AzApplicationGatewayRedirectConfiguration `
  -Name myredirect `
  -RedirectType Temporary `
  -TargetUrl "https://bing.com"
$redirectRule = New-AzApplicationGatewayRequestRoutingRule `
  -Name redirectRule `
  -RuleType Basic `
  -HttpListener $defaultListener `
  -RedirectConfiguration $redirectConfig

Create the application gateway

Now that you created the necessary supporting resources, specify parameters for the application gateway named myAppGateway using New-AzApplicationGatewaySku, and then create it using New-AzApplicationGateway.

$sku = New-AzApplicationGatewaySku `
  -Name Standard_Medium `
  -Tier Standard `
  -Capacity 2
$appgw = New-AzApplicationGateway `
  -Name myAppGateway `
  -ResourceGroupName myResourceGroupAG `
  -Location eastus `
  -BackendAddressPools $defaultPool `
  -BackendHttpSettingsCollection $poolSettings `
  -FrontendIpConfigurations $fipconfig `
  -GatewayIpConfigurations $gipconfig `
  -FrontendPorts $frontendport `
  -HttpListeners $defaultListener `
  -RequestRoutingRules $redirectRule `
  -RedirectConfigurations $redirectConfig `
  -Sku $sku

Test the application gateway

You can use Get-AzPublicIPAddress to get the public IP address of the application gateway. Copy the public IP address, and then paste it into the address bar of your browser.

Get-AzPublicIPAddress -ResourceGroupName myResourceGroupAG -Name myAGPublicIPAddress

You should see bing.com appear in your browser.

Next steps