My first PowerShell runbook
This tutorial walks you through the creation of a PowerShell runbook in Azure Automation. You start with a simple runbook that you test and publish while you learn how to track the status of the runbook job. Then you modify the runbook to actually manage Azure resources, in this case starting an Azure virtual machine. Lastly, you make the runbook more robust by adding runbook parameters.
To complete this tutorial, you need the following:
- Azure subscription. If you don't have one yet, you can activate your MSDN subscriber benefits or sign up for a free account.
- Automation account to hold the runbook and authenticate to Azure resources. This account must have permission to start and stop the virtual machine.
- An Azure virtual machine. You stop and start this machine so it should not be a production VM.
Step 1 - Create new runbook
You start by creating a simple runbook that outputs the text Hello World.
In the Azure portal, open your Automation account.
The Automation account page gives you a quick view of the resources in this account. You should already have some assets. Most of those are the modules that are automatically included in a new Automation account. You should also have the Credential asset that's mentioned in the prerequisites.
Click Runbooks under Process Automation to open the list of runbooks.
- Create a new runbook by clicking the + Add a runbook button and then Create a new runbook.
- Give the runbook the name MyFirstRunbook-PowerShell.
- In this case, you're going to create a PowerShell runbook so select Powershell for Runbook type.
- Click Create to create the runbook and open the textual editor.
Step 2 - Add code to the runbook
You can either type code directly into the runbook, or you can select cmdlets, runbooks, and assets from the Library control and have them added to the runbook with any related parameters. For this walkthrough, you type directly in the runbook.
- Your runbook is currently empty, type Write-Output "Hello World." in the body of the script.
- Save the runbook by clicking Save.
Step 3 - Test the runbook
Before you publish the runbook to make it available in production, you want to test it to make sure that it works properly. When you test a runbook, you run its Draft version and view its output interactively.
- Click Test pane to open the Test pane.
- Click Start to start the test. This should be the only enabled option.
A runbook job is created and its status displayed.
The job status starts as Queued indicating that it is waiting for a runbook worker in the cloud to come available. It moves to Starting when a worker claims the job, and then Running when the runbook actually starts running.
When the runbook job completes, its output is displayed. In your case, you should see Hello World.
- Close the Test pane to return to the canvas.
Step 4 - Publish and start the runbook
The runbook that you created is still in Draft mode. you need to publish it before you can run it in production. When you publish a runbook, you overwrite the existing Published version with the Draft version. In your case, you don't have a Published version yet because you just created the runbook.
- Click Publish to publish the runbook and then Yes when prompted.
- If you scroll left to view the runbook in the Runbooks pane now, it shows an Authoring Status of Published.
- Scroll back to the right to view the pane for MyFirstRunbook-PowerShell.
The options across the top allow us to start the runbook, view the runbook, schedule it to start at some time in the future, or create a webhook so it can be started through an HTTP call.
- You want to start the runbook, so click Start and then click Ok when the Start Runbook page opens.
- A job page is opened for the runbook job that you created. You can close this pane, but in this case you leave it open so you can watch the job's progress.
- The job status is shown in Job Summary and matches the statuses that you saw when you tested the runbook.
- Once the runbook status shows Completed, under Overview click Output. The Output pane is opened, and you can see your Hello World.
- Close the Output page.
- Click All Logs to open the Streams pane for the runbook job. You should only see Hello World in the output stream, but this can show other streams for a runbook job such as Verbose and Error if the runbook writes to them.
- Close the Streams page and the Job page to return to the MyFirstRunbook-PowerShell page.
- Under Details, click Jobs to open the Jobs pane for this runbook. This lists all of the jobs created by this runbook. You should only see one job listed since you only ran the job once.
- You can click this job to open the same Job pane that you viewed when you started the runbook. This allows you to go back in time and view the details of any job that was created for a particular runbook.
Step 5 - Add authentication to manage Azure resources
You've tested and published your runbook, but so far it doesn't do anything useful. You want to have it manage Azure resources. It is not able to do that though unless You have it authenticate using the credentials that are referred to in the prerequisites. You do that with the Connect-AzureRmAccount cmdlet.
- Open the textual editor by clicking Edit on the MyFirstRunbook-PowerShell page.
- You don't need the Write-Output line anymore, so go ahead and delete it.
Type or copy and paste the following code that handles the authentication with your Automation Run As account:
$Conn = Get-AutomationConnection -Name AzureRunAsConnection Connect-AzureRmAccount -ServicePrincipal -Tenant $Conn.TenantID ` -ApplicationId $Conn.ApplicationID -CertificateThumbprint $Conn.CertificateThumbprint
Add-AzureRmAccount and Login-AzureRmAccount are now aliases for Connect-AzureRMAccount. If the Connect-AzureRMAccount cmdlet does not exist, you can use Add-AzureRmAccount or Login-AzureRmAccount, or you can update your modules in your Automation Account to the latest versions.
Click Test pane so that you can test the runbook.
- Click Start to start the test. Once it completes, you should receive output similar to the following, displaying basic information from your account. This confirms that the credential is valid.
Step 6 - Add code to start a virtual machine
Now that your runbook is authenticating to your Azure subscription, you can manage resources. You add a command to start a virtual machine. You can pick any virtual machine in your Azure subscription, and for now you hardcode that name in the runbook.
After Connect-AzureRmAccount, type Start-AzureRmVM -Name 'VMName' -ResourceGroupName 'NameofResourceGroup' providing the name and Resource Group name of the virtual machine to start.
$Conn = Get-AutomationConnection -Name AzureRunAsConnection Connect-AzureRmAccount -ServicePrincipal -Tenant $Conn.TenantID ` -ApplicationID $Conn.ApplicationID -CertificateThumbprint $Conn.CertificateThumbprint Start-AzureRmVM -Name 'VMName' -ResourceGroupName 'ResourceGroupName'
- Save the runbook and then click Test pane so that you can test it.
- Click Start to start the test. Once it completes, check that the virtual machine was started.
Step 7 - Add an input parameter to the runbook
Your runbook currently starts the virtual machine that you hardcoded in the runbook, but it would be more useful if you specify the virtual machine when the runbook is started. You add input parameters to the runbook to provide that functionality.
Add parameters for VMName and ResourceGroupName to the runbook and use these variables with the Start-AzureRmVM cmdlet as in the following example.
Param( [string]$VMName, [string]$ResourceGroupName ) $Conn = Get-AutomationConnection -Name AzureRunAsConnection Connect-AzureRmAccount -ServicePrincipal -Tenant $Conn.TenantID ` -ApplicationID $Conn.ApplicationID -CertificateThumbprint $Conn.CertificateThumbprint Start-AzureRmVM -Name $VMName -ResourceGroupName $ResourceGroupName
- Save the runbook and open the Test pane. You can now provide values for the two input variables that are used in the test.
- Close the Test pane.
- Click Publish to publish the new version of the runbook.
- Stop the virtual machine that you started in the previous step.
- Click OK to start the runbook. Type in the VMName and ResourceGroupName for the virtual machine that you're going to start.
- When the runbook completes, check that the virtual machine was started.
Differences from PowerShell Workflow
PowerShell runbooks have the same lifecycle, capabilities, and management as PowerShell Workflow runbooks but there are some differences and limitations:
- PowerShell runbooks run fast compared to PowerShell Workflow runbooks as they don’t have compilation step.
- PowerShell Workflow runbooks support checkpoints, using checkpoints, PowerShell Workflow runbooks can resume from any point in the runbook whereas PowerShell runbooks can only resume from the beginning.
- PowerShell Workflow runbooks support parallel and serial execution whereas PowerShell runbooks can only execute commands serially.
- In a PowerShell Workflow runbook, an activity, a command, or a script block can have its own runspace whereas in a PowerShell runbook, everything in a script runs in a single runspace. There are also some syntactic differences between a native PowerShell runbook and a PowerShell Workflow runbook.
- To get started with Graphical runbooks, see My first graphical runbook
- To get started with PowerShell workflow runbooks, see My first PowerShell workflow runbook
- To know more about runbook types, their advantages and limitations, see Azure Automation runbook types
- For more information on PowerShell script support feature, see Native PowerShell script support in Azure Automation