This blog describes how to onboard multiple VM’s to Azure Automation.

From an administration computer: First login to both ASM and ARM

Add-AzureAccount
Login-AzureRmAccount

Here is the function that installs the Azure Automation DSC extension on the VM. The script originated from this site,

https://azure.microsoft.com/sv-se/documentation/articles/automation-dsc-onboarding/

To be able to onboard a huge amount of vm’s we need to make some kind of loop and that’s what I have done.

 
function sVm {
    param(
    $VMName,
    $ServiceName,
    $AutomationAccountName,
    $AutomationAccountResourceGroup
    )

    # fill in the name of a Node Configuration in Azure Automation DSC, for this VM to conform to
    $NodeConfigName = ''

    # get Azure Automation DSC registration info
    $Account = Get-AzureRmAutomationAccount  -Name $AutomationAccountName -ResourceGroupName $AutomationAccountResourceGroup
    $RegistrationInfo = $Account | Get-AzureRmAutomationRegistrationInfo
    # use the DSC extension to onboard the VM for management with Azure Automation DSC
    $VM = Get-AzureVM -Name $VMName -ServiceName $ServiceName
    $PublicConfiguration = ConvertTo-Json -Depth 8 @{
      SasToken = ''
      ModulesUrl = "https://eus2oaasibizamarketprod1.blob.core.windows.net/automationdscpreview/RegistrationMetaConfigV2.zip"
      ConfigurationFunction = "RegistrationMetaConfigV2.ps1RegistrationMetaConfigV2"
    # update these DSC agent Local Configuration Manager defaults if they do not match your use case.
    Properties = @{
       RegistrationKey = @{
         UserName = 'notused'
         Password = 'PrivateSettingsRef:RegistrationKey'
    }
      RegistrationUrl = $RegistrationInfo.Endpoint
      NodeConfigurationName = $NodeConfigName
      ConfigurationMode = "ApplyAndMonitor"
      ConfigurationModeFrequencyMins = 15
      RefreshFrequencyMins = 30
      RebootNodeIfNeeded = $False
      ActionAfterReboot = "ContinueConfiguration"
      AllowModuleOverwrite = $False
      }
    }
    $PrivateConfiguration = ConvertTo-Json -Depth 8 @{
      Items = @{
         RegistrationKey = $RegistrationInfo.PrimaryKey
      }
    }
    $VM = Set-AzureVMExtension  -VM $vm -Publisher Microsoft.Powershell -ExtensionName DSC  -Version 2.6 -PublicConfiguration $PublicConfiguration -PrivateConfiguration $PrivateConfiguration -ForceUpdate
    $VM | Update-AzureVM
} 

Finally, we create a variable with the VM’s and then loop through them.

$allvm=get-azurevm
$allvm.ForEach({
    sVm -VMName ($PSItem.Name) -ServiceName ($PSItem.ServiceName) -AutomationAccountName "[NameOfYourAutomationAccount]" -AutomationAccountResourceGroup "NameOfAutomationAccountResourceGroup"
})