Secure and Private Connectivity between Azure VM and Azure Private DNS
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Secure and Private Connectivity between Azure VM and Azure Private DNS

Azure Private Link is a feature that allows you to access Azure PaaS services (like Azure Storage, Azure SQL, and Azure Cosmos DB) and Azure Virtual Networks (VNet) securely and privately from your VNet. This feature allows you to access Azure PaaS services and Azure Virtual Networks privately, without having to traverse the public internet. One of the benefits of using Azure Private Link is that it provides enhanced security, as the traffic between your VNet and the service is fully encrypted and does not traverse the public internet.

To implement Private Link between an Azure Virtual Machine and an Azure Private DNS, you will need to perform the following steps:

  1. Create a Virtual Network (VNet) and a Virtual Machine (VM) in the same region.
  2. Create an Azure Private DNS zone in the same region as the VNet and VM.
  3. Create a Private Endpoint for the Azure Private DNS zone.
  4. Configure your VM to use the Private Endpoint for DNS resolution.

Here is an example of how to create a VNet, a VM, and an Azure Private DNS zone using Azure PowerShell:

# Create a new VNet
$vnet = New-AzVirtualNetwork -Name "myVNet" -ResourceGroupName "myResourceGroup" -Location "West US" -AddressPrefix "10.0.0.0/16"

# Create a new VM
$vm = New-AzVM -Name "myVM" -ResourceGroupName "myResourceGroup" -Location "West US" -VirtualNetworkId $vnet.Id -SubnetId $vnet.Subnets[0].Id -PublicIpAddressId $pip.Id

# Create a new Azure Private DNS zone
$dnsZone = New-AzPrivateDnsZone -Name "myprivatelink.com" -ResourceGroupName "myResourceGroup" -Location "West US"

# Create a private endpoint for the Azure Private DNS zone
$privateEndpoint = New-AzPrivateDnsRecordSet -Name "privatelink" -RecordType "A" -ZoneName $dnsZone.Name -ResourceGroupName $dnsZone.ResourceGroupName -PrivateIpAddress $vm.PrivateIpAddress

Once the Private Endpoint is created, you will need to configure your VM to use the Private Endpoint for DNS resolution. You can do this by modifying the VM's network interface settings and specifying the private IP address of the Private Endpoint as the primary DNS server.

# Update the network interface settings of the VM
$nic = Get-AzNetworkInterface -Name "myVMNic" -ResourceGroupName "myResourceGroup"
$nic | Set-AzNetworkInterfaceDnsSettings -PrimaryDns $privateEndpoint.PrivateIpAddress

By following these steps, you will be able to implement Private Link between an Azure Virtual Machine and an Azure Private DNS. This will allow you to access Azure Private DNS services securely and privately from your VNet, without having to traverse the public internet.

It is important to note that when creating a Private Link for Azure Private DNS, it only affects the traffic to the Private DNS zone and not to the VMs in your VNet .

It's important to mention that there are some restrictions when using Private Link with Azure Private DNS, for example, it's only available for Azure Private DNS zone and not for custom DNS zones. Also, you can't use a Private Link with Azure Private DNS to resolve public internet names.

I hope this helps! Let me know if you have any questions.