How to create App Service Environment ASEv3

Setting App Service Environment ASEv3

App Service Environment is a single-tenant deployment of Azure App Service. You use it with an Azure virtual network. 

Azure App Service Environment can be created with an internet-accessible endpoint, which is public endpoint, is called an External ASE or an endpoint on an internal address in an Azure Virtual Network. When created with an internal endpoint, that endpoint is provided by an Azure component called an internal load balancer (ILB). The App Service Environment on an internal IP address is called an ILB ASE.

Before we create an ASE, there are some things that must be in place.Prerequisites

• An Azure Virtual Network.

• A subnet in that virtual network of recommended size of /24 with 256 addresses to accommodate future growth and scaling needs. After the App Service Environment is created, you can’t change the size.

• The location you want to deploy into.

Steps to Create App Service Environment ASEv3

1. Search Azure Marketplace for the App Service Environment v3.
2. From the Basics tab, for Subscription, select the subscription.
3. For Resource Group, select or create the resource group, and enter the name of your App Service Environment.
4. For App Service Environment Name, enter a name. The name must be no more than 36 characters. The name you choose will also be used for the domain suffix. For example, if the name you choose is testkrit, and you have an internal VIP, the domain suffix will be testkrit.appserviceenvironment.net. If the name you choose is testkrit, and you have an external VIP, the domain suffix will be testkrit.p.azurewebsites.net.
5. For Virtual IP, select Internal if you want your inbound IP address to be an address from your subnet. Select External exposes the ASE-hosted apps on an internet-accessible IP address.
6. From the Hosting tab, for Physical hardware isolation, select Enabled or Disabled. If we enable this option, we can deploy onto dedicated hardware. With a dedicated host deployment, Microsoft charges for two dedicated hosts per pricing when you create the App Service Environment v3 and then, as we scale, we are charged a specialized Isolated v2 rate per vCore. I1v2 uses two vCores, I2v2 uses four vCores, and I3v2 uses eight vCores per instance. For Zone redundancy, select Enabled or Disabled. 
7. From the Networking tab, for Virtual Network, select or create virtual network. For Subnet, select or create empty subnet. If you’re creating an App Service Environment with an internal VIP, you can configure Azure DNS private zones to point your domain suffix to your App Service Environment. For more information, see the DNS section in Use an App Service Environment. If you’re creating an App Service Environment with an internal VIP, you can specify private IP address using Manual option for Inbound IP address.

If you’re creating an App Service Environment with an external VIP, you can select public IP address using Manual option for Inbound IP address.

From the Review + create tab, check that your configuration is correct, and select Create. Your App Service Environment can take more than one hour to create.

When your App Service Environment has been successfully created, you can select it as a location when you’re creating your apps.