storage-files-networking-endpoints-private-powershell.md

title	include file
description	include file
services	storage
author	khdownie
ms.service	azure-file-storage
ms.topic	include
ms.date	5/11/2020
ms.author	kendownie
ms.custom	include file, devx-track-azurepowershell

To create a private endpoint for your storage account, you first need to get a reference to your storage account and the virtual network subnet to which you want to add the private endpoint. Replace <storage-account-resource-group-name>, <storage-account-name>, <vnet-resource-group-name>, <vnet-name>, and <vnet-subnet-name> below:

$storageAccountResourceGroupName = "<storage-account-resource-group-name>"
$storageAccountName = "<storage-account-name>"
$virtualNetworkResourceGroupName = "<vnet-resource-group-name>"
$virtualNetworkName = "<vnet-name>"
$subnetName = "<vnet-subnet-name>"

# Get storage account reference, and throw error if it doesn't exist
$storageAccount = Get-AzStorageAccount `
        -ResourceGroupName $storageAccountResourceGroupName `
        -Name $storageAccountName `
        -ErrorAction SilentlyContinue

if ($null -eq $storageAccount) {
    $errorMessage = "Storage account $storageAccountName not found "
    $errorMessage += "in resource group $storageAccountResourceGroupName."
    Write-Error -Message $errorMessage -ErrorAction Stop
}

# Get virtual network reference, and throw error if it doesn't exist
$virtualNetwork = Get-AzVirtualNetwork `
        -ResourceGroupName $virtualNetworkResourceGroupName `
        -Name $virtualNetworkName `
        -ErrorAction SilentlyContinue

if ($null -eq $virtualNetwork) {
    $errorMessage = "Virtual network $virtualNetworkName not found "
    $errorMessage += "in resource group $virtualNetworkResourceGroupName."
    Write-Error -Message $errorMessage -ErrorAction Stop
}

# Get reference to virtual network subnet, and throw error if it doesn't exist
$subnet = $virtualNetwork | `
    Select-Object -ExpandProperty Subnets | `
    Where-Object { $_.Name -eq $subnetName }

if ($null -eq $subnet) {
    Write-Error `
            -Message "Subnet $subnetName not found in virtual network $virtualNetworkName." `
            -ErrorAction Stop
}

To create a private endpoint, you must create a private link service connection to the storage account. The private link service connection is an input to the creation of the private endpoint.

# Disable private endpoint network policies
$subnet.PrivateEndpointNetworkPolicies = "Disabled"
$virtualNetwork = $virtualNetwork | `
    Set-AzVirtualNetwork -ErrorAction Stop

# Create a private link service connection to the storage account.
$privateEndpointConnection = New-AzPrivateLinkServiceConnection `
        -Name "$storageAccountName-Connection" `
        -PrivateLinkServiceId $storageAccount.Id `
        -GroupId "file" `
        -ErrorAction Stop

# Create a new private endpoint.
$privateEndpoint = New-AzPrivateEndpoint `
        -ResourceGroupName $storageAccountResourceGroupName `
        -Name "$storageAccountName-PrivateEndpoint" `
        -Location $virtualNetwork.Location `
        -Subnet $subnet `
        -PrivateLinkServiceConnection $privateEndpointConnection `
        -ErrorAction Stop

Creating an Azure private DNS zone enables the original name of the storage account, such as storageaccount.file.core.windows.net to resolve to the private IP inside of the virtual network. Although optional from the perspective of creating a private endpoint, it is explicitly required for mounting the Azure file share directly using an AD user principal or accessing via the REST API.

# Get the desired storage account suffix (core.windows.net for public cloud).
# This is done like this so this script will seamlessly work for non-public Azure.
$storageAccountSuffix = Get-AzContext | `
    Select-Object -ExpandProperty Environment | `
    Select-Object -ExpandProperty StorageEndpointSuffix

# For public cloud, this will generate the following DNS suffix:
# privatelink.file.core.windows.net.
$dnsZoneName = "privatelink.file.$storageAccountSuffix"

# Find a DNS zone matching desired name attached to this virtual network.
$dnsZone = Get-AzPrivateDnsZone | `
    Where-Object { $_.Name -eq $dnsZoneName } | `
    Where-Object {
        $privateDnsLink = Get-AzPrivateDnsVirtualNetworkLink `
                -ResourceGroupName $_.ResourceGroupName `
                -ZoneName $_.Name `
                -ErrorAction SilentlyContinue
        
        $privateDnsLink.VirtualNetworkId -eq $virtualNetwork.Id
    }

if ($null -eq $dnsZone) {
    # No matching DNS zone attached to virtual network, so create new one.
    $dnsZone = New-AzPrivateDnsZone `
            -ResourceGroupName $virtualNetworkResourceGroupName `
            -Name $dnsZoneName `
            -ErrorAction Stop

    $privateDnsLink = New-AzPrivateDnsVirtualNetworkLink `
            -ResourceGroupName $virtualNetworkResourceGroupName `
            -ZoneName $dnsZoneName `
            -Name "$virtualNetworkName-DnsLink" `
            -VirtualNetworkId $virtualNetwork.Id `
            -ErrorAction Stop
}

Now that you have a reference to the private DNS zone, you must create an A record for your storage account.

$privateEndpointIP = $privateEndpoint | `
    Select-Object -ExpandProperty NetworkInterfaces | `
    Select-Object @{ 
        Name = "NetworkInterfaces"; 
        Expression = { Get-AzNetworkInterface -ResourceId $_.Id } 
    } | `
    Select-Object -ExpandProperty NetworkInterfaces | `
    Select-Object -ExpandProperty IpConfigurations | `
    Select-Object -ExpandProperty PrivateIpAddress

$privateDnsRecordConfig = New-AzPrivateDnsRecordConfig `
        -IPv4Address $privateEndpointIP

New-AzPrivateDnsRecordSet `
        -ResourceGroupName $virtualNetworkResourceGroupName `
        -Name $storageAccountName `
        -RecordType A `
        -ZoneName $dnsZoneName `
        -Ttl 600 `
        -PrivateDnsRecords $privateDnsRecordConfig `
        -ErrorAction Stop | `
    Out-Null