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Quickstart: Deploy Azure Firewall with Availability Zones - Bicep

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In this quickstart, you use Bicep to deploy an Azure Firewall in three Availability Zones.

Bicep is a domain-specific language (DSL) that uses declarative syntax to deploy Azure resources. It provides concise syntax, reliable type safety, and support for code reuse. Bicep offers the best authoring experience for your infrastructure-as-code solutions in Azure.

The Bicep file creates a test network environment with a firewall. The network has one virtual network (VNet) with three subnets: AzureFirewallSubnet, ServersSubnet, and JumpboxSubnet. The ServersSubnet and JumpboxSubnet subnet each have a single, two-core Windows Server virtual machine.

The firewall is in the AzureFirewallSubnet subnet, and has an application rule collection with a single rule that allows access to www.microsoft.com.

A user-defined route points network traffic from the ServersSubnet subnet through the firewall, where the firewall rules are applied.

For more information about Azure Firewall, see Deploy and configure Azure Firewall using the Azure portal.

Prerequisites

Review the Bicep file

This Bicep file creates an Azure Firewall with Availability Zones, along with the necessary resources to support the Azure Firewall.

The Bicep file used in this quickstart is from Azure Quickstart Templates.

Bicep 
@description('virtual network name')
param virtualNetworkName string = 'test-vnet'

@description('Location for all resources.')
param location string = resourceGroup().location

@description('Username for the Virtual Machine.')
param adminUsername string

@description('Password for the Virtual Machine.')
@secure()
param adminPassword string

@description('Availability zone numbers e.g. 1,2,3.')
param availabilityZones array = [
  '1'
  '2'
  '3'
]

@description('Number of public IP addresses for the Azure Firewall')
@minValue(1)
@maxValue(100)
param numberOfFirewallPublicIPAddresses int = 1

@description('Size of the virtual machine.')
param jumpBoxSize string = 'Standard_D2s_v3'

@description('Size of the virtual machine.')
param serverSize string = 'Standard_D2s_v3'

var vnetAddressPrefix = '10.0.0.0/16'
var serversSubnetPrefix = '10.0.2.0/24'
var azureFirewallSubnetPrefix = '10.0.1.0/24'
var jumpboxSubnetPrefix = '10.0.0.0/24'
var nextHopIP = '10.0.1.4'
var azureFirewallSubnetName = 'AzureFirewallSubnet'
var jumpBoxSubnetName = 'JumpboxSubnet'
var serversSubnetName = 'ServersSubnet'
var jumpBoxPublicIPAddressName = 'JumpHostPublicIP'
var jumpBoxNsgName = 'JumpHostNSG'
var jumpBoxNicName = 'JumpHostNic'
var jumpBoxSubnetId = resourceId('Microsoft.Network/virtualNetworks/subnets', virtualNetworkName, jumpBoxSubnetName)
var serverNicName = 'ServerNic'
var serverSubnetId = resourceId('Microsoft.Network/virtualNetworks/subnets', virtualNetworkName, serversSubnetName)
var storageAccountName = '${uniqueString(resourceGroup().id)}sajumpbox'
var azfwRouteTableName = 'AzfwRouteTable'
var firewallName = 'firewall1'
var publicIPNamePrefix = 'publicIP'
var azureFirewallSubnetId = resourceId('Microsoft.Network/virtualNetworks/subnets', virtualNetworkName, azureFirewallSubnetName)
var azureFirewallSubnetJSON = json('{"id": "${azureFirewallSubnetId}"}')
var networkSecurityGroupName = '${serversSubnetName}-nsg'
var azureFirewallIpConfigurations = [for i in range(0, numberOfFirewallPublicIPAddresses): {
  name: 'IpConf${i}'
  properties: {
    subnet: ((i == 0) ? azureFirewallSubnetJSON : json('null'))
    publicIPAddress: {
      id: publicIPAddress[i].id
    }
  }
}]

resource storageAccount 'Microsoft.Storage/storageAccounts@2021-08-01' = {
  name: storageAccountName
  location: location
  sku: {
    name: 'Standard_LRS'
  }
  kind: 'Storage'
  properties: {}
}

resource azfwRouteTable 'Microsoft.Network/routeTables@2021-03-01' = {
  name: azfwRouteTableName
  location: location
  properties: {
    disableBgpRoutePropagation: false
    routes: [
      {
        name: 'AzfwDefaultRoute'
        properties: {
          addressPrefix: '0.0.0.0/0'
          nextHopType: 'VirtualAppliance'
          nextHopIpAddress: nextHopIP
        }
      }
    ]
  }
}

resource nsg 'Microsoft.Network/networkSecurityGroups@2021-03-01' = {
  name: networkSecurityGroupName
  location: location
  properties: {}
}

resource virtualNetwork 'Microsoft.Network/virtualNetworks@2021-05-01' = {
  name: virtualNetworkName
  location: location
  tags: {
    displayName: virtualNetworkName
  }
  properties: {
    addressSpace: {
      addressPrefixes: [
        vnetAddressPrefix
      ]
    }
    subnets: [
      {
        name: jumpBoxSubnetName
        properties: {
          addressPrefix: jumpboxSubnetPrefix
        }
      }
      {
        name: azureFirewallSubnetName
        properties: {
          addressPrefix: azureFirewallSubnetPrefix
        }
      }
      {
        name: serversSubnetName
        properties: {
          addressPrefix: serversSubnetPrefix
          routeTable: {
            id: azfwRouteTable.id
          }
          networkSecurityGroup: {
            id: nsg.id
          }
        }
      }
    ]
  }
}

resource publicIPAddress 'Microsoft.Network/publicIPAddresses@2021-03-01' = [for i in range(0, numberOfFirewallPublicIPAddresses): {
  name: '${publicIPNamePrefix}${i+1}'
  location: location
  sku: {
    name: 'Standard'
  }
  properties: {
    publicIPAllocationMethod: 'Static'
    publicIPAddressVersion: 'IPv4'
  }
  zones: availabilityZones
}]

resource jumpBoxPublicIPAddress 'Microsoft.Network/publicIPAddresses@2021-03-01' = {
  name: jumpBoxPublicIPAddressName
  location: location
  properties: {
    publicIPAllocationMethod: 'Dynamic'
  }
}

resource jumpBoxNsg 'Microsoft.Network/networkSecurityGroups@2021-05-01' = {
  name: jumpBoxNsgName
  location: location
  properties: {
    securityRules: [
      {
        name: 'myNetworkSecurityGroupRuleRDP'
        properties: {
          protocol: 'Tcp'
          sourcePortRange: '*'
          destinationPortRange: '3389'
          sourceAddressPrefix: '*'
          destinationAddressPrefix: '*'
          access: 'Allow'
          priority: 1000
          direction: 'Inbound'
        }
      }
    ]
  }
}

resource JumpBoxNic 'Microsoft.Network/networkInterfaces@2021-05-01' = {
  name: jumpBoxNicName
  location: location
  properties: {
    ipConfigurations: [
      {
        name: 'ipconfig1'
        properties: {
          privateIPAllocationMethod: 'Dynamic'
          publicIPAddress: {
            id: jumpBoxPublicIPAddress.id
          }
          subnet: {
            id: jumpBoxSubnetId
          }
        }
      }
    ]
    networkSecurityGroup: {
      id: jumpBoxNsg.id
    }
  }
  dependsOn: [
    virtualNetwork
  ]
}

resource ServerNic 'Microsoft.Network/networkInterfaces@2021-05-01' = {
  name: serverNicName
  location: location
  properties: {
    ipConfigurations: [
      {
        name: 'ipconfig1'
        properties: {
          privateIPAllocationMethod: 'Dynamic'
          subnet: {
            id: serverSubnetId
          }
        }
      }
    ]
  }
  dependsOn: [
    virtualNetwork
  ]
}

resource JumpBoxVM 'Microsoft.Compute/virtualMachines@2021-11-01' = {
  name: 'JumpBox'
  location: location
  tags: { 
    AzSecPackAutoConfigReady: true 
  }
  properties: {
    hardwareProfile: {
      vmSize: jumpBoxSize
    }
    storageProfile: {
      imageReference: {
        publisher: 'MicrosoftCBLMariner'
        offer: 'cbl-mariner'
        sku: 'cbl-mariner-2-gen2'
        version: 'latest'
      }
      osDisk: {
        osType: 'Linux'
        createOption: 'FromImage'
        diskSizeGB: 127
      }
    }
    osProfile: {
      computerName: 'JumpBox'
      adminUsername: adminUsername
      adminPassword: adminPassword
      linuxConfiguration:{
          patchSettings: { 
              patchMode: 'AutomaticByPlatform'
          }
      }
    }
    networkProfile: {
      networkInterfaces: [
        {
          id: JumpBoxNic.id
        }
      ]
    }
    diagnosticsProfile: {
      bootDiagnostics: {
        enabled: true
        storageUri: storageAccount.properties.primaryEndpoints.blob
      }
    }
  }
}

resource ServerVM 'Microsoft.Compute/virtualMachines@2021-11-01' = {
  name: 'Server'
  location: location
  tags: { 
    AzSecPackAutoConfigReady: true 
  }
  properties: {
    hardwareProfile: {
      vmSize: serverSize
    }
    storageProfile: {
      imageReference: {
        publisher: 'MicrosoftCBLMariner'
        offer: 'cbl-mariner'
        sku: 'cbl-mariner-2-gen2'
        version: 'latest'
      }
      osDisk: {
        osType: 'Linux'
        createOption: 'FromImage'
        diskSizeGB: 127
      }
    }
    osProfile: {
      computerName: 'Server'
      adminUsername: adminUsername
      adminPassword: adminPassword
      linuxConfiguration:{
          patchSettings: { 
              patchMode: 'AutomaticByPlatform'
          }
      }
    }
    networkProfile: {
      networkInterfaces: [
        {
          id: ServerNic.id
        }
      ]
    }
    diagnosticsProfile: {
      bootDiagnostics: {
        enabled: true
        storageUri: storageAccount.properties.primaryEndpoints.blob
      }
    }
  }
}

resource firewall 'Microsoft.Network/azureFirewalls@2021-05-01' = {
  name: firewallName
  location: location
  zones: ((length(availabilityZones) == 0) ? json('null') : availabilityZones)
  properties: {
    ipConfigurations: azureFirewallIpConfigurations
    applicationRuleCollections: [
      {
        name: 'appRc1'
        properties: {
          priority: 101
          action: {
            type: 'Allow'
          }
          rules: [
            {
              name: 'appRule1'
              protocols: [
                {
                  port: 80
                  protocolType: 'Http'
                }
                {
                  port: 443
                  protocolType: 'Https'
                }
              ]
              targetFqdns: [
                'www.microsoft.com'
              ]
              sourceAddresses: [
                '10.0.2.0/24'
              ]
            }
          ]
        }
      }
    ]
    networkRuleCollections: [
      {
        name: 'netRc1'
        properties: {
          priority: 200
          action: {
            type: 'Allow'
          }
          rules: [
            {
              name: 'netRule1'
              protocols: [
                'TCP'
              ]
              sourceAddresses: [
                '10.0.2.0/24'
              ]
              destinationAddresses: [
                '*'
              ]
              destinationPorts: [
                '8000-8999'
              ]
            }
          ]
        }
      }
    ]
  }
  dependsOn: [
    virtualNetwork
    publicIPAddress
  ]
}

Multiple Azure resources are defined in the Bicep file:

Deploy the Bicep file

  1. Save the Bicep file as main.bicep to your local computer.

  2. Deploy the Bicep file using either Azure CLI or Azure PowerShell.

    Azure CLI 
    az group create --name exampleRG --location eastus
az deployment group create --resource-group exampleRG --template-file main.bicep --parameters adminUsername=<admin-user>

    Note

    Replace <admin-user> with the administrator login username for the virtual machine. You'll be prompted to enter adminPassword.

When the deployment finishes, you should see a message indicating the deployment succeeded.

Review deployed resources

Use the Azure portal, Azure CLI, or Azure PowerShell to validate the deployment and review the deployed resources.

Azure CLI 
az resource list --resource-group exampleRG

To learn about the syntax and properties for a firewall in a Bicep file, see Microsoft.Network/azureFirewalls.

Clean up resources

When you no longer need them, use the Azure portal, Azure CLI, or Azure PowerShell to remove the resource group, firewall, and all related resources.

Azure CLI 
az group delete --name exampleRG

Next steps

Next, you can monitor the Azure Firewall logs.

Tutorial: Monitor Azure Firewall logs