Azure Application Gateway Subnet Name Configuration Best Practices

Naming your Azure Application Gateway subnet is a crucial step in configuring your application infrastructure. Choose a name that accurately reflects its purpose, such as "app-gateway-subnet" or "public-subnet".

In Azure, subnet names must be unique within a virtual network. This means you can't have two subnets with the same name in the same VNet, even if they're in different resource groups.

To avoid confusion, consider using a consistent naming convention throughout your Azure resources. This will make it easier to identify and manage your subnets and other resources. For example, you could use a prefix like "app-gateway-" followed by a descriptive name like "subnet-1".

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Creating Azure Application Gateway is a crucial step in setting up your infrastructure. You can create a dedicated subnet for the App Gateway, which is only used by the App Gateway instances.

First, you should create a new subnet for the App Gateway instances. This subnet is only to be used by the App Gateway. Use the Add-AzVirtualNetworkSubnetConfig cmdlet with the following syntax.

To create an application gateway, you need to follow a specific order of steps. With Resource Manager, all items that make an application gateway are configured individually and then put together to create the application gateway resource.

Here are the steps you need to follow to create an application gateway:

Creating an application gateway configuration object is a critical step in the process. This step creates an application gateway IP configuration named "gatewayIP01".

This step configures the backend IP address pool named "pool01" with IP addresses "10.1.1.8, 10.1.1.9, 10.1.1.10". Those are the IP addresses that receive the network traffic that comes from the frontend IP endpoint.

To create an application gateway, you can use the New-AzureApplicationGateway cmdlet. This cmdlet creates an application gateway with all configuration items from the preceding steps.

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Configuring Application Gateway involves creating a gateway IP configuration object, which is used to route network traffic to the backend IP pool. This object is named "gatewayIP01" and is configured to pick up an IP address from a subnet and route traffic accordingly.

To create this object, you need to specify the IP addresses that will receive the network traffic, such as "10.1.1.8, 10.1.1.9, 10.1.1.10". These IP addresses are part of the backend IP pool named "pool01".

The backend IP pool is configured with a setting named "poolsetting01" to handle the load balanced network traffic. This setting is crucial for ensuring that the traffic is distributed evenly across the backend pool.

A dedicated subnet is required for the App Gateway instances, and it's essential to create a new subnet specifically for this purpose. This subnet is only used by the App Gateway and should not be used for any other purposes.

You can create this subnet using the Add-AzVirtualNetworkSubnetConfig cmdlet, which is the recommended method for adding a new subnet to a virtual network.

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