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articles/app-service/environment/creation.md

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## Before you create your App Service Environment
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Be aware that after you create your App Service Environment, you can't change any of the following:
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After you create your App Service Environment, you can't change any of the following:
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- Location
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- Subscription
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Before you deploy your App Service Environment, think about the virtual IP (VIP) type and the deployment type.
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With an *internal VIP*, an address in your App Service Environment subnet reaches your apps. Your apps aren't on a public DNS. When you create your App Service Environment in the Azure portal, you have an option to create an Azure private DNS zone for your App Service Environment. With an *external VIP*, your apps are on an address facing the public internet, and they're in a public DNS. For both *internal VIP* and *external VIP* you can specify *Inbound IP address*, you can select *Automatic* or *Manual* options. If you want to use the *Manual* option for an *Inbound IP address* you must first create a standard *Public IP address* in Azure.
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With an *internal VIP*, an address in your App Service Environment subnet reaches your apps. Your apps aren't on a public DNS. When you create your App Service Environment in the Azure portal, you have an option to create an Azure private DNS zone for your App Service Environment. With an *external VIP*, your apps are on an address facing the public internet, and they're in a public DNS. For both *internal VIP* and *external VIP* you can specify *Inbound IP address*, you can select *Automatic* or *Manual* options. If you want to use the *Manual* option for an *Inbound IP address*, you must first create a standard *Public IP address* in Azure.
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For the deployment type, you can choose *single zone*, *zone redundant*, or *host group*. The single zone is available in all regions where App Service Environment v3 is available. With the single zone deployment type, you have a minimum charge in your App Service plan of one instance of Windows Isolated v2. As soon as you have one or more instances, then that charge goes away. It isn't an additive charge.
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For the deployment type, you can choose *single zone*, *zone redundant*, or *host group*. The single zone is available in all regions where App Service Environment v3 is available. With the single zone deployment type, you have a minimum charge in your App Service plan of one instance of Windows Isolated v2. As soon as you've one or more instances, then that charge goes away. It isn't an additive charge.
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In a zone redundant App Service Environment, your apps spread across three zones in the same region. Zone redundant is available in regions that support availability zones. With this deployment type, the smallest size for your App Service plan is three instances. That ensures that there is an instance in each availability zone. App Service plans can be scaled up one or more instances at a time. Scaling doesn't need to be in units of three, but the app is only balanced across all availability zones when the total instances are multiples of three.
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In a zone redundant App Service Environment, your apps spread across three zones in the same region. Zone redundant is available in regions that support availability zones. With this deployment type, the smallest size for your App Service plan is three instances. That ensures that there's an instance in each availability zone. App Service plans can be scaled up one or more instances at a time. Scaling doesn't need to be in units of three, but the app is only balanced across all availability zones when the total instances are multiples of three.
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A zone redundant deployment has triple the infrastructure, and ensures that even if two of the three zones go down, your workloads remain available. Due to the increased system need, the minimum charge for a zone redundant App Service Environment is nine instances. If you have fewer than this number of instances, the difference is charged as Windows I1v2. If you have nine or more instances, there is no added charge to have a zone redundant App Service Environment. To learn more about zone redundancy, see [Regions and availability zones](./overview-zone-redundancy.md).
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A zone redundant deployment has triple the infrastructure, and ensures that even if two of the three zones go down, your workloads remain available. Due to the increased system need, the minimum charge for a zone redundant App Service Environment is nine instances. If you've fewer than this number of instances, the difference is charged as Windows I1v2. If you've nine or more instances, there's no added charge to have a zone redundant App Service Environment. To learn more about zone redundancy, see [Regions and availability zones](./overview-zone-redundancy.md).
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In a host group deployment, your apps are deployed onto a dedicated host group. The dedicated host group isn't zone redundant. With this type of deployment, you can install and use your App Service Environment on dedicated hardware. There is no minimum instance charge for using App Service Environment on a dedicated host group, but you do have to pay for the host group when you're provisioning the App Service Environment. You also pay a discounted App Service plan rate as you create your plans and scale out.
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In a host group deployment, your apps are deployed onto a dedicated host group. The dedicated host group isn't zone redundant. With this type of deployment, you can install and use your App Service Environment on dedicated hardware. There's no minimum instance charge for using App Service Environment on a dedicated host group, but you do have to pay for the host group when you're provisioning the App Service Environment. You also pay a discounted App Service plan rate as you create your plans and scale out.
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With a dedicated host group deployment, there are a finite number of cores available that are used by both the App Service plans and the infrastructure roles. This type of deployment can't reach the 200 total instance count normally available in App Service Environment. The number of total instances possible is related to the total number of App Service plan instances, plus the load-based number of infrastructure roles.
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![Screenshot that shows the App Service Environment hosting selections.](./media/creation/creation-hosting.png)
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4. From the **Networking** tab, for **Virtual Network**, select or create your virtual network. For **Subnet**, select or create your 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 details, see the DNS section in [Use an App Service Environment][UsingASE]. 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**.
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4. From the **Networking** tab, for **Virtual Network**, select or create your virtual network. For **Subnet**, select or create your 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][UsingASE]. 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**.
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![Screenshot that shows App Service Environment networking (ASE Internal) selections.](./media/creation/creation-networking-internal.png)
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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**.
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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**.
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![Screenshot that shows App Service Environment networking (ASE Internal) selections.](./media/creation/creation-networking-external.png)
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