Azure Hybrid Benefit: Maximize Your Existing Microsoft Licenses

Azure Hybrid Benefit lets you use your existing Windows Server and SQL Server licenses on Azure, saving up to 40% on VMs and up to 55% on Azure SQL. Let’s explore how to maximize this benefit.

Understanding Azure Hybrid Benefit

If you have Windows Server or SQL Server licenses with Software Assurance, you can bring them to Azure instead of paying for new licenses.

Enabling for Windows Server VMs

resource windowsVM 'Microsoft.Compute/virtualMachines@2021-11-01' = {
  name: 'windows-vm'
  location: location
  properties: {
    licenseType: 'Windows_Server'  // Enable Hybrid Benefit
    hardwareProfile: {
      vmSize: 'Standard_D4s_v3'
    }
    storageProfile: {
      imageReference: {
        publisher: 'MicrosoftWindowsServer'
        offer: 'WindowsServer'
        sku: '2022-datacenter-azure-edition'
        version: 'latest'
      }
      osDisk: {
        createOption: 'FromImage'
      }
    }
    osProfile: {
      computerName: 'winvm'
      adminUsername: adminUsername
      adminPassword: adminPassword
    }
    networkProfile: {
      networkInterfaces: [
        {
          id: nic.id
        }
      ]
    }
  }
}

Enabling for SQL Server VMs

resource sqlVM 'Microsoft.SqlVirtualMachine/sqlVirtualMachines@2021-11-01-preview' = {
  name: 'sql-vm'
  location: location
  properties: {
    virtualMachineResourceId: vm.id
    sqlServerLicenseType: 'AHUB'  // Azure Hybrid Benefit
    sqlManagement: 'Full'
    sqlImageSku: 'Enterprise'
  }
}

Azure SQL Database with Hybrid Benefit

resource sqlDatabase 'Microsoft.Sql/servers/databases@2021-11-01' = {
  parent: sqlServer
  name: 'mydb'
  location: location
  sku: {
    name: 'GP_Gen5'
    tier: 'GeneralPurpose'
    family: 'Gen5'
    capacity: 4
  }
  properties: {
    licenseType: 'BasePrice'  // Hybrid Benefit - bring your own license
    // 'LicenseIncluded' for pay-as-you-go
  }
}

Checking Hybrid Benefit Status

# Check all VMs for Hybrid Benefit status
Get-AzVM | ForEach-Object {
    [PSCustomObject]@{
        Name = $_.Name
        ResourceGroup = $_.ResourceGroupName
        LicenseType = $_.LicenseType
        HybridBenefit = if ($_.LicenseType -eq 'Windows_Server') { 'Enabled' } else { 'Disabled' }
    }
} | Format-Table

# Enable Hybrid Benefit on existing VM
$vm = Get-AzVM -ResourceGroupName 'myRG' -Name 'myVM'
$vm.LicenseType = 'Windows_Server'
Update-AzVM -ResourceGroupName 'myRG' -VM $vm

Azure Policy for Enforcement

Ensure all new VMs use Hybrid Benefit:

{
  "mode": "All",
  "policyRule": {
    "if": {
      "allOf": [
        {
          "field": "type",
          "equals": "Microsoft.Compute/virtualMachines"
        },
        {
          "field": "Microsoft.Compute/virtualMachines/storageProfile.imageReference.publisher",
          "equals": "MicrosoftWindowsServer"
        },
        {
          "field": "Microsoft.Compute/virtualMachines/licenseType",
          "notEquals": "Windows_Server"
        }
      ]
    },
    "then": {
      "effect": "audit"
    }
  }
}

License Counting

# Count cores for licensing requirements
$vms = Get-AzVM | Where-Object { $_.LicenseType -eq 'Windows_Server' }

$totalCores = 0
foreach ($vm in $vms) {
    $vmSize = Get-AzVMSize -Location $vm.Location |
              Where-Object { $_.Name -eq $vm.HardwareProfile.VmSize }
    $totalCores += $vmSize.NumberOfCores
}

# Windows Server licenses cover 16 cores minimum per 2-pack
$licensesNeeded = [Math]::Ceiling($totalCores / 16) * 2
Write-Host "Total cores: $totalCores"
Write-Host "Licenses needed (2-packs): $licensesNeeded"

Combining with Reserved Instances

You can stack Hybrid Benefit with Reserved Instances for maximum savings:

Pay-as-you-go:     $1000/month
With RIs (3-year): $400/month (60% savings)
With Hybrid:       $600/month (40% savings)
Both combined:     $240/month (76% savings!)

Best Practices

1. Audit existing licenses - Work with your SAM team
2. Track usage - Ensure compliance
3. Automate enablement - Use policies
4. Combine with RIs - Stack discounts
5. Review regularly - License needs change

Azure Hybrid Benefit is one of the simplest ways to reduce Azure costs if you have existing Microsoft licenses.