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ms.date 2017-06-12
author eslesar
ms.topic conceptual
keywords dsc,powershell,configuration,setup
title Desired State Configuration Quick Start

Applies To: Windows PowerShell 4.0, Windows PowerShell 5.0

Desired State Configuration Quick Start

This exercise walks through creating and applying a Desired State Configuration (DSC) configuration from start to finish. The example we'll use ensures that a server has the Web-Server (IIS) feature enabled, and that the content for a simple "Hello World" website is present in the intepub\wwwroot directory of that server.

For an overview of what DSC is and how it works, see Desired State Configuration Overview for Decision Makers.

Requirements

To run this example, you will need a computer running Windows Server 2012 or later and PowerShell 4.0 or later.

Write and place the index.htm file

First, we'll create the HTML file that we will use as the website content.

In your root folder, create a folder named test.

In a text editor, type the following text:

<head></head>
<body>
<p>Hello World!</p>
</body>

Save this as index.htm in the test folder you created earlier.

Write the configuration

A DSC configuration is a special PowerShell function that defines how you want to configure one or more target computers (nodes).

In the PowerShell ISE, type the following:

Configuration WebsiteTest {

    # Import the module that contains the resources we're using.
    Import-DscResource -ModuleName PsDesiredStateConfiguration

    # The Node statement specifies which targets this configuration will be applied to.
    Node 'localhost' {

        # The first resource block ensures that the Web-Server (IIS) feature is enabled.
        WindowsFeature WebServer {
            Ensure = "Present"
            Name   = "Web-Server"
        }

        # The second resource block ensures that the website content copied to the website root folder.
        File WebsiteContent {
            Ensure = 'Present'
            SourcePath = 'c:\test\index.htm'
            DestinationPath = 'c:\inetpub\wwwroot'
        }
    }
}

Save the file as WebsiteTest.ps1.

You can see that it looks like a PowerShell function, with the addition of the keyword Configuration used before the name of the function.

The Node block specifies the target node to be configured, in this case localhost.

The configuration calls two resources, WindowsFeature and File. Resources do the work of ensuring that the target node is in the state defined by the configuration.

Compile the configuration

For a DSC configuration to be applied to a node, it must first be compiled into a MOF file. To do this, you run the configuration like a function. In a PowerShell console, navigate to the same folder where you saved your configuration and run the following commands to compile the configuration into a MOF file:

. .\WebsiteTest.ps1
WebsiteTest

This generates the following output:

Directory: C:\ConfigurationTest\WebsiteTest


Mode                LastWriteTime         Length Name
----                -------------         ------ ----
-a----        3/13/2017   5:20 PM           2746 localhost.mof

The first line makes the configuration function available in the console. The second line runs the configuration. The result is that a new folder, named WebsiteTest is created as a subfolder of the current folder. The WebsiteTest folder contains a file named localhost.mof. It is this file that can then be applied to the target node.

Apply the configuration

Now that you have the compiled MOF, you can apply the configuration to the target node (in this case, the local computer) by calling the Start-DscConfiguration cmdlet.

The Start-DscConfiguration cmdlet tells the Local Configuration Manager (LCM), which is the engine of DSC, to apply the configuration. The LCM does the work of calling the DSC resources to apply the configuration.

In a PowerShell console, navigate to the same folder where you saved your configuration and run the following command:

Start-DscConfiguration .\WebsiteTest

Test the configuration

You can call the Get-DscConfigurationStatus cmdlet to see whether the configuration succeeded.

You can also test the results directly, in this case by browsing to http://localhost/ in a web browser. You should see the "Hello World" HTML page you created as the first step in this example.

Next steps