Migrate to Azure Firewall Premium

You can migrate Azure Firewall Standard to Azure Firewall Premium to take advantage of the new Premium capabilities. For more information about Azure Firewall Premium features, see Azure Firewall Premium features.

This article guides you with the required steps to manually migrate your Standard firewall and policy to Premium.

Before you start the migration, understand the performance considerations and plan ahead for the required maintenance window. Typical down time of 20-30 minutes is expected.

The following general steps are required for a successful migration:

  1. Create new Premium policy based on your existing Standard policy or classic rules. By the end of this step your new premium policy will include all your existing rules and policy settings.
  2. Migrate Azure Firewall from Standard to Premium using stop/start.
  3. Attach the newly created Premium policy to your Premium Firewall.

Important

Upgrading a Standard Firewall deployed in Southeast Asia with Availability Zones is not currently supported.

If you use Terraform to deploy the Azure Firewall, you can use Terraform to migrate to Azure Firewall Premium. For more information, see Migrate Azure Firewall Standard to Premium using Terraform.

Performance considerations

Performance is a consideration when migrating from the standard SKU. IDPS and TLS inspection are compute intensive operations. The premium SKU uses a more powerful VM SKU, which scales to a maximum throughput of 30 Gbps comparable with the standard SKU. The 30-Gbps throughput is supported when configured with IDPS in alert mode. Use of IDPS in deny mode and TLS inspection increases CPU consumption. Degradation in max throughput might occur.

The firewall throughput might be lower than 30 Gbps when you’ve one or more signatures set to Alert and Deny or application rules with TLS inspection enabled. Microsoft recommends customers perform full-scale testing in their Azure deployment to ensure the firewall service performance meets your expectations.

Downtime

Migrate your firewall during a planned maintenance time, as there will be some downtime when you Migrate Azure Firewall from Standard to Premium using stop/start.

Migrate Classic rules to Standard policy

During your migration process, you may need to migrate your Classic firewall rules to a Standard policy. You can do this using the Azure portal:

  1. From the Azure portal, select your standard firewall. On the Overview page, select Migrate to firewall policy.

    Migrate to firewall policy

  2. On the Migrate to firewall policy page, select Review + create.

  3. Select Create.

    The deployment takes a few minutes to complete.

You can also migrate existing Classic rules from Azure Firewall using Azure PowerShell to create policies. For more information, see Migrate Azure Firewall configurations to Azure Firewall policy using PowerShell

Migrate an existing policy using Azure PowerShell

Transform-Policy.ps1 is an Azure PowerShell script that creates a new Premium policy from an existing Standard policy.

Given a standard firewall policy ID, the script transforms it to a Premium Azure firewall policy. The script first connects to your Azure account, pulls the policy, transforms/adds various parameters, and then uploads a new Premium policy. The new premium policy is named <previous_policy_name>_premium. If it's a child policy transformation, a link to the parent policy will remain.

Usage example:

Transform-Policy -PolicyId /subscriptions/XXXXX-XXXXXX-XXXXX/resourceGroups/some-resource-group/providers/Microsoft.Network/firewallPolicies/policy-name

Important

The script doesn't migrate Threat Intelligence and SNAT private ranges settings. You'll need to note those settings before proceeding and migrate them manually. Otherwise, you might encounter inconsistent traffic filtering with your new upgraded firewall.

This script requires the latest Azure PowerShell. Run Get-Module -ListAvailable Az to see which versions are installed. If you need to install, see Install Azure PowerShell module.

<#
    .SYNOPSIS
        Given an Azure firewall policy id the script will transform it to a Premium Azure firewall policy. 
        The script will first pull the policy, transform/add various parameters and then upload a new premium policy. 
        The created policy will be named <previous_policy_name>_premium if no new name provided else new policy will be named as the parameter passed.  
    .Example
        Transform-Policy -PolicyId /subscriptions/XXXXX-XXXXXX-XXXXX/resourceGroups/some-resource-group/providers/Microsoft.Network/firewallPolicies/policy-name -NewPolicyName <optional param for the new policy name>
#>

param (
    #Resource id of the azure firewall policy. 
    [Parameter(Mandatory=$true)]
    [string]
    $PolicyId,

    #new filewallpolicy name, if not specified will be the previous name with the '_premium' suffix
    [Parameter(Mandatory=$false)]
    [string]
    $NewPolicyName = ""
)
$ErrorActionPreference = "Stop"
$script:PolicyId = $PolicyId
$script:PolicyName = $NewPolicyName

function ValidatePolicy {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory=$true)]
        [Object]
        $Policy
    )

    Write-Host "Validating resource is as expected"

    if ($null -eq $Policy) {
        Write-Error "Recived null policy"
        exit(1)
    }
    if ($Policy.GetType().Name -ne "PSAzureFirewallPolicy") {
        Write-Host "Resource must be of type Microsoft.Network/firewallPolicies" -ForegroundColor Red
        exit(1)
    }

    if ($Policy.Sku.Tier -eq "Premium") {
        Write-Host "Policy is already premium"
        exit(1)
    }
}

function GetPolicyNewName {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory=$true)]
        [Microsoft.Azure.Commands.Network.Models.PSAzureFirewallPolicy]
        $Policy
    )

    if (-not [string]::IsNullOrEmpty($script:PolicyName)) {
        return $script:PolicyName
    }

    return $Policy.Name + "_premium"
}

function TransformPolicyToPremium {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory=$true)]
        [Microsoft.Azure.Commands.Network.Models.PSAzureFirewallPolicy]
        $Policy
    )    
    $NewPolicyParameters = @{
                        Name = (GetPolicyNewName -Policy $Policy) 
                        ResourceGroupName = $Policy.ResourceGroupName 
                        Location = $Policy.Location 
                        ThreatIntelMode = $Policy.ThreatIntelMode 
                        BasePolicy = $Policy.BasePolicy.Id 
                        DnsSetting = $Policy.DnsSettings 
                        Tag = $Policy.Tag 
                        SkuTier = "Premium" 
    }

    Write-Host "Creating new policy"
    $premiumPolicy = New-AzFirewallPolicy @NewPolicyParameters

    Write-Host "Populating rules in new policy"
    foreach ($ruleCollectionGroup in $Policy.RuleCollectionGroups) {
        $ruleResource = Get-AzResource -ResourceId $ruleCollectionGroup.Id
        $ruleToTransfom = Get-AzFirewallPolicyRuleCollectionGroup -AzureFirewallPolicy $Policy -Name $ruleResource.Name
        $ruleCollectionGroup = @{
            FirewallPolicyObject = $premiumPolicy
            Priority = $ruleToTransfom.Properties.Priority
            Name = $ruleToTransfom.Name
        }

        if ($ruleToTransfom.Properties.RuleCollection.Count) {
            $ruleCollectionGroup["RuleCollection"] = $ruleToTransfom.Properties.RuleCollection
        }

        Set-AzFirewallPolicyRuleCollectionGroup @ruleCollectionGroup
    }
}

function ValidateAzNetworkModuleExists {
    Write-Host "Validating needed module exists"
    $networkModule = Get-InstalledModule -Name "Az.Network" -MinimumVersion 4.5 -ErrorAction SilentlyContinue
    if ($null -eq $networkModule) {
        Write-Host "Please install Az.Network module version 4.5.0 or higher, see instructions: https://github.com/Azure/azure-powershell#installation"
        exit(1)
    }
    $resourceModule = Get-InstalledModule -Name "Az.Resources" -MinimumVersion 4.2 -ErrorAction SilentlyContinue
    if ($null -eq $resourceModule) {
        Write-Host "Please install Az.Resources module version 4.2.0 or higher, see instructions: https://github.com/Azure/azure-powershell#installation"
        exit(1)
    }
    Import-Module Az.Network -MinimumVersion 4.5.0
    Import-Module Az.Resources -MinimumVersion 4.2.0
}

ValidateAzNetworkModuleExists
$policy = Get-AzFirewallPolicy -ResourceId $script:PolicyId
ValidatePolicy -Policy $policy
TransformPolicyToPremium -Policy $policy

Migrate Azure Firewall using stop/start

If you use Azure Firewall Standard SKU with firewall policy, you can use the Allocate/Deallocate method to migrate your Firewall SKU to Premium. This migration approach is supported on both VNet Hub and Secure Hub Firewalls. When you migrate a Secure Hub deployment, it will preserve the firewall public IP address.

The minimum Azure PowerShell version requirement is 6.5.0. For more information, see Az 6.5.0.

Migrate a VNET Hub Firewall

  • Deallocate the Standard Firewall

    $azfw = Get-AzFirewall -Name "<firewall-name>" -ResourceGroupName "<resource-group-name>"
    $azfw.Deallocate()
    Set-AzFirewall -AzureFirewall $azfw
    
  • Allocate Firewall Premium (single public IP address)

    $azfw = Get-AzFirewall -Name "<firewall-name>" -ResourceGroupName "<resource-group-name>"
    $azfw.Sku.Tier="Premium"
    $vnet = Get-AzVirtualNetwork -ResourceGroupName "<resource-group-name>" -Name "<Virtual-Network-Name>"
    $publicip = Get-AzPublicIpAddress -Name "<Firewall-PublicIP-name>" -ResourceGroupName "<resource-group-name>"
    $azfw.Allocate($vnet,$publicip)
    Set-AzFirewall -AzureFirewall $azfw
    
  • Allocate Firewall Premium (multiple public IP addresses)

    $azfw = Get-AzFirewall -Name "FW Name" -ResourceGroupName "RG Name"
    $azfw.Sku.Tier="Premium"
    $vnet = Get-AzVirtualNetwork -ResourceGroupName "RG Name" -Name "VNet Name"
    $publicip1 = Get-AzPublicIpAddress -Name "Public IP1 Name" -ResourceGroupName "RG Name"
    $publicip2 = Get-AzPublicIpAddress -Name "Public IP2 Name" -ResourceGroupName "RG Name"
    $azfw.Allocate($vnet,@($publicip1,$publicip2))
    Set-AzFirewall -AzureFirewall $azfw
    
  • Allocate Firewall Premium in Forced Tunnel Mode

    $azfw = Get-AzFirewall -Name "<firewall-name>" -ResourceGroupName "<resource-group-name>"
    $azfw.Sku.Tier="Premium"
    $vnet = Get-AzVirtualNetwork -ResourceGroupName "<resource-group-name>" -Name "<Virtual-Network-Name>"
    $publicip = Get-AzPublicIpAddress -Name "<Firewall-PublicIP-name>" -ResourceGroupName "<resource-group-name>"
    $mgmtPip = Get-AzPublicIpAddress -ResourceGroupName "<resource-group-name>"-Name "<Management-PublicIP-name>"
    $azfw.Allocate($vnet,$publicip,$mgmtPip)
    Set-AzFirewall -AzureFirewall $azfw
    

Migrate a Secure Hub Firewall

  • Deallocate the Standard Firewall

    $azfw = Get-AzFirewall -Name "<firewall-name>" -ResourceGroupName "<resource-group-name>"
    $azfw.Deallocate()
    Set-AzFirewall -AzureFirewall $azfw
    
  • Allocate Firewall Premium

    $azfw = Get-AzFirewall -Name -Name "<firewall-name>" -ResourceGroupName "<resource-group-name>"
    $hub = get-azvirtualhub -ResourceGroupName "<resource-group-name>" -name "<vWANhub-name>"
    $azfw.Sku.Tier="Premium"
    $azfw.Allocate($hub.id)
    Set-AzFirewall -AzureFirewall $azfw
    

Attach a Premium policy to a Premium Firewall

You can attach a Premium policy to the new Premium Firewall using the Azure portal:

Screenshot showing firewall policy

Next steps