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Copy file name to clipboardExpand all lines: articles/app-service/environment/create-from-template.md
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---
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title: Create an ASE with ARM
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title: Create an ASE with Azure Resource Manager
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description: Learn how to create an external or ILB App Service environment by using an Azure Resource Manager template.
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author: madsd
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ms.assetid: 6eb7d43d-e820-4a47-818c-80ff7d3b6f8e
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ms.topic: article
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ms.date: 10/11/2021
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ms.date: 01/20/2023
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ms.author: madsd
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ms.custom: seodec18, devx-track-azurepowershell
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---
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# Create an ASE by using an Azure Resource Manager template
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## Overview
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> [!NOTE]
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> This article is about the App Service Environment v2 and App Service Environment v3 which are used with Isolated App Service plans
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>
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> [!IMPORTANT]
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> This article is about App Service Environment v2 which is used with Isolated App Service plans. [App Service Environment v2 will be retired on 31 August 2024](https://azure.microsoft.com/updates/app-service-environment-v1-and-v2-retirement-announcement/). There's a new version of App Service Environment that is easier to use and runs on more powerful infrastructure. To learn more about the new version, start with the [Introduction to the App Service Environment](overview.md). If you're currently using App Service Environment v2, please follow the steps in [this article](migration-alternatives.md) to migrate to the new version.
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>
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Azure App Service environments (ASEs) can be created with an internet-accessible endpoint 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 ASE on an internal IP address is called an ILB ASE. The ASE with a public endpoint is called an External ASE.
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An ASE can be created by using the Azure portal or an Azure Resource Manager template. This article walks through the steps and syntax you need to create an External ASE or ILB ASE with Resource Manager templates. To learn how to create an ASEv2 in the Azure portal, see [Make an External ASE][MakeExternalASE] or [Make an ILB ASE][MakeILBASE].
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To learn how to create an ASEv3 in Azure portal, see [Create ASEv3][Create ASEv3].
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When you create an ASE in the Azure portal, you can create your virtual network at the same time or choose a preexisting virtual network to deploy into.
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When you create an ASE in the Azure portal, you can create your virtual network at the same time or choose a pre-existing virtual network to deploy into.
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When you create an ASE from a template, you must start with:
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* An Azure Virtual Network.
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* A subnet in that virtual network. We recommend an ASE subnet size of `/24` with 256 addresses to accommodate future growth and scaling needs. After the ASE is created, you can't change the size.
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* When you creating an ASE into preexisting virtual network and subnet, the existing resource group name, virtual network name and subnet name are required.
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* The subscription you want to deploy into.
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* The location you want to deploy into.
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To automate your ASE creation, follow they guidelines in the sections below. If you are creating an ILB ASEv2 with custom dnsSuffix (for example, `internal-contoso.com`), there are a few more things to do.
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To automate your ASE creation, follow they guidelines in the following sections. If you're creating an ILB ASEv2 with custom dnsSuffix (for example, `internal-contoso.com`), there are a few more things to do.
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1. After your ILB ASE with custom dnsSuffix is created, an TLS/SSL certificate that matches your ILB ASE domain should be uploaded.
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2. The uploaded TLS/SSL certificate is assigned to the ILB ASE as its "default" TLS/SSL certificate. This certificate is used for TLS/SSL traffic to apps on the ILB ASE when they use the common root domain that's assigned to the ASE (for example, `https://someapp.internal-contoso.com`).
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## Create the ASE
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A Resource Manager template that creates an ASE and its associated parameters file is available on GitHub for [ASEv3][asev3quickstarts] and [ASEv2][quickstartasev2create].
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If you want to make an ASE, use these Resource Manager template [ASEv3][asev3quickstarts] or [ASEv2][quickstartilbasecreate] example. They cater to that use case. Most of the parameters in the *azuredeploy.parameters.json* file are common to the creation of ILB ASEs and External ASEs. The following list calls out parameters of special note, or that are unique, when you create an ILB ASE with an existing subnet.
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### ASEv3 parameters
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**aseName*: Required. This parameter defines an unique ASE name.
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**internalLoadBalancingMode*: Required. In most cases, set this to 3, which means both HTTP/HTTPS traffic on ports 80/443. If this property is set to 0, the HTTP/HTTPS traffic remains on the public VIP.
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**zoneRedundant*: Required. In most cases, set this to false, which means the ASE will not be deployed into Availability Zones(AZ). Zonal ASEs can be deployed in some regions, you can refer to [this][AZ Support for ASEv3].
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**dedicatedHostCount*: Required. In most cases, set this to 0, which means the ASE will be deployed as normal without dedicated hosts deployed.
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**useExistingVnetandSubnet*: Required. Set to true if using an existing virtual network and subnet.
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**vNetResourceGroupName*: Required if using an existing virtual network and subnet. This parameter defines the resource group name of the existing virtual network and subnet where ASE will reside.
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**virtualNetworkName*: Required if using an existing virtual network and subnet. This parameter defines the virtual network name of the existing virtual network and subnet where ASE will reside.
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**subnetName*: Required if using an existing virtual network and subnet. This parameter defines the subnet name of the existing virtual network and subnet where ASE will reside.
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**createPrivateDNS*: Set to true if you want to create a private DNS zone after ASEv3 created. For an ILB ASE, when set this parameter to true, it will create a private DNS zone as ASE name with *appserviceenvironment.net* DNS suffix.
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### ASEv2 parameters
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**aseName*: This parameter defines an unique ASE name.
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A Resource Manager template that creates an ASE and its associated parameters file is available on GitHub for [ASEv2][quickstartasev2create].
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If you want to make an ASE, use this Resource Manager template [ASEv2][quickstartilbasecreate] example. Most of the parameters in the *azuredeploy.parameters.json* file are common to the creation of ILB ASEs and External ASEs. The following list calls out parameters of special note, or that's unique, when you create an ILB ASE with an existing subnet.
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### Parameters
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**aseName*: This parameter defines a unique ASE name.
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**location*: This parameter defines the location of the App Service Environment.
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**existingVirtualNetworkName*: This parameter defines the virtual network name of the existing virtual network and subnet where ASE will reside.
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**existingVirtualNetworkResourceGroup*: his parameter defines the resource group name of the existing virtual network and subnet where ASE will reside.
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***Subject**: This attribute must be set to **.your-root-domain-here.com*.
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***Subject Alternative Name**: This attribute must include both **.your-root-domain-here.com* and **.scm.your-root-domain-here.com*. TLS connections to the SCM/Kudu site associated with each app use an address of the form *your-app-name.scm.your-root-domain-here.com*.
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With a valid TLS/SSL certificate in hand, two additional preparatory steps are needed. Convert/save the TLS/SSL certificate as a .pfx file. Remember that the .pfx file must include all intermediate and root certificates. Secure it with a password.
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With a valid TLS/SSL certificate in hand, two more preparatory steps are needed. Convert/save the TLS/SSL certificate as a .pfx file. Remember that the .pfx file must include all intermediate and root certificates. Secure it with a password.
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The .pfx file needs to be converted into a base64 string because the TLS/SSL certificate is uploaded by using a Resource Manager template. Because Resource Manager templates are text files, the .pfx file must be converted into a base64 string. This way it can be included as a parameter of the template.
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**existingAseLocation*: Text string containing the Azure region where the ILB ASE was deployed. For example: "South Central US".
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**pfxBlobString*: The based64-encoded string representation of the .pfx file. Use the code snippet shown earlier and copy the string contained in "exportedcert.pfx.b64". Paste it in as the value of the *pfxBlobString* attribute.
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**password*: The password used to secure the .pfx file.
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**certificateThumbprint*: The certificate's thumbprint. If you retrieve this value from PowerShell (for example, *$certificate.Thumbprint* from the earlier code snippet), you can use the value as is. If you copy the value from the Windows certificate dialog box, remember to strip out the extraneous spaces. The *certificateThumbprint* should look something like AF3143EB61D43F6727842115BB7F17BBCECAECAE.
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**certificateThumbprint*: The certificate's thumbprint. If you retrieve this value from PowerShell (for example, `$certificate.Thumbprint` from the earlier code snippet), you can use the value as is. If you copy the value from the Windows certificate dialog box, remember to strip out the extraneous spaces. The *certificateThumbprint* should look something like AF3143EB61D43F6727842115BB7F17BBCECAECAE.
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**certificateName*: A friendly string identifier of your own choosing used to identity the certificate. The name is used as part of the unique Resource Manager identifier for the *Microsoft.Web/certificates* entity that represents the TLS/SSL certificate. The name *must* end with the following suffix: \_yourASENameHere_InternalLoadBalancingASE. The Azure portal uses this suffix as an indicator that the certificate is used to secure an ILB-enabled ASE.
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An abbreviated example of *azuredeploy.parameters.json* is shown here:
It takes roughly 40 minutes per ASE front end to apply the change. For example, for a default-sized ASE that uses two front ends, the template takes around one hour and 20 minutes to complete. While the template is running, the ASE can't scale.
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It takes roughly 40 minutes per ASE front end to apply the change. For example, for a default-sized ASE that uses two front ends, the template takes around 1 hour and 20 minutes to complete. While the template is running, the ASE can't scale.
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After the template finishes, apps on the ILB ASE can be accessed over HTTPS. The connections are secured by using the default TLS/SSL certificate. The default TLS/SSL certificate is used when apps on the ILB ASE are addressed by using a combination of the application name plus the default host name. For example, `https://mycustomapp.internal-contoso.com` uses the default TLS/SSL certificate for **.internal-contoso.com*.
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