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AWS OpsWorks
User Guide (API Version 2013-02-18)

Running a Windows PowerShell Script

Note

These examples assume that you have already done the Running a Recipe on a Windows Instance example. If not, you should do that example first. In particular, it describes how to enable RDP access to your instances.

One way to have a recipe perform tasks on a Windows instance—especially tasks that do not have a corresponding Chef resource—is to have the recipe run a Windows PowerShell script. This section introduces you to the basics by describing how to use a Windows PowerShell script to install a Windows feature.

The powershell_script resource runs Windows PowerShell cmdlets on an instance. The following example uses a Install-WindowsFeature cmdlet to install an XPS viewer on the instance.

The following briefly summarizes how to create a stack for this example. For more information, see Create a New Stack.

Create a stack

  1. Open the AWS OpsWorks Stacks console and choose Add Stack. Specify the following settings, accept the defaults for the other settings, and click Add Stack.

    • Name – PowerShellTest

    • Region – US West (Oregon)

      This example will work in any region, but we recommend using US West (Oregon) for tutorials.

    • Default operating system – Microsoft Windows Server 2012 R2

  2. Choose Add a layer and add a custom layer to the stack with the following settings.

    • Name – PowerShell

    • Short name – powershell

  3. Add a 24/7 instance to with default settings to the PowerShell layer and start it.

  4. Choose Permissions and then Edit, and select SSH/RDP and sudo/admin. You need this authorization in addition to the AWS-OpsWorks-RDP-Server security group to log in to the instance as a regular user.

While the instance is starting up—it usually takes several minutes—you can create the cookbook. The recipe for this example creates a data directory, and is basically the recipe from Example 3: Creating Directories, modified for Windows.

To set up the cookbook

  1. Create a directory named powershell and navigate to it.

  2. Create a metadata.rb file with the following content and save it to windowstest.

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    name "powershell" version "0.1.0"
  3. Create a recipes directory within the powershell directory.

  4. Create a default.rb file with the following recipe and save it to the recipes directory.

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    Chef::Log.info("******Installing XPS.******") powershell_script "Install XPS Viewer" do code <<-EOH Install-WindowsFeature XPS-Viewer EOH guard_interpreter :powershell_script not_if "(Get-WindowsFeature -Name XPS-Viewer).installed" end
    • The powershell_script resource runs a cmdlet to install the XPS viewer.

      This example runs only one cmdlet, but the code block can contain any number of command lines.

    • The guard_interpreter attribute directs Chef to use the 64-bit version of Windows PowerShell.

    • The not_if guard attribute ensures that Chef does not install the feature if it has already been installed.

  5. Create a .zip archive of the powershell directory.

  6. Upload the archive to an Amazon S3 bucket, make the archive public, and record the archive's URL. It should look something like https://s3-us-west-2.amazonaws.com/opsworks-windows/powershell.zip. You can also use a private archive, but a public archive is sufficient for this example, and somewhat easier to work with.

You can now install the cookbook and run the recipe.

To run the recipe

  1. Edit the stack to enable custom cookbooks and specify the following settings.

    • Repository typeS3 Archive

    • Repository URL – The cookbook archive URL that you recorded earlier

    Accept the default values for the other settings and choose Save to update the stack configuration.

  2. Run the Update Custom Cookbooks stack command to install the current version of your custom cookbooks on the instance.

  3. After Update Custom Cookbooks has finished, execute the recipe by running the Execute Recipes stack command with Recipes to execute set to powershell::default.

Note

This example uses Execute Recipes for convenience, but you typically have AWS OpsWorks Stacks run your recipes automatically by assigning them to the appropriate lifecycle event. You can run such recipes by manually triggering the event. You can use a stack command to trigger Setup and Configure events, and a deploy command to trigger Deploy and Undeploy events.

After the recipe runs successfully, you can verify it.

To verify the powershell recipe

  1. Examine the Chef log. Click show in the powershell1 instance's Log column to display the log. Scroll down and you will see your log message near the bottom.

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    ... [2015-04-27T18:12:09+00:00] INFO: Storing updated cookbooks/powershell/metadata.rb in the cache. [2015-04-27T18:12:09+00:00] INFO: ******Installing XPS.****** [2015-04-27T18:12:09+00:00] INFO: Processing powershell_script[Install XPS Viewer] action run (powershell::default line 3) [2015-04-27T18:12:09+00:00] INFO: Processing powershell_script[Guard resource] action run (dynamically defined) [2015-04-27T18:12:42+00:00] INFO: powershell_script[Install XPS Viewer] ran successfully ...
  2. Use RDP to log in to the instance and open the Start menu. XPS Viewer should be listed with Windows Accessories.