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Deploy an Azure Firewall with Availability Zones using Azure PowerShell

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Azure Firewall can be configured during deployment to span multiple Availability Zones for increased availability.

This feature enables the following scenarios:

  • You can increase availability to 99.99% uptime. For more information, see the Azure Firewall Service Level Agreement (SLA). The 99.99% uptime SLA is offered when two or more Availability Zones are selected.
  • You can also associate Azure Firewall to a specific zone just for proximity reasons, using the service standard 99.95% SLA.

For more information about Azure Firewall Availability Zones, see Azure Firewall Standard features.

The following Azure PowerShell example shows how you can deploy an Azure Firewall with Availability Zones.

Create a firewall with Availability Zones

This example creates a firewall in zones 1, 2, and 3.

When the standard public IP address is created, no specific zone is specified. This creates a zone-redundant IP address by default. Standard public IP addresses can be configured either in all zones, or a single zone.

It's important to know, because you can't have a firewall in zone 1 and an IP address in zone 2. But you can have a firewall in zone 1 and IP address in all zones, or a firewall and an IP address in the same single zone for proximity purposes.

$rgName = "Test-FW-RG"

$vnet = Get-AzVirtualNetwork `
  -Name "Test-FW-VN" `
  -ResourceGroupName $rgName

$pip1 = New-AzPublicIpAddress `
  -Name "AzFwPublicIp1" `
  -ResourceGroupName "Test-FW-RG" `
  -Sku "Standard" `
  -Location "eastus" `
  -AllocationMethod Static `
  -Zone 1,2,3

New-AzFirewall `
  -Name "azFw" `
  -ResourceGroupName $rgName `
  -Location "eastus" `
  -VirtualNetwork $vnet `
  -PublicIpAddress @($pip1) `
  -Zone 1,2,3

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