Skip to main content

Desired State Configuration - ConfigurationData


Update 12.10.2016 - More functions added to repro some while ago

This module has been laying dormant in my BitBucket repro. Looks like people are realizing that DSC is about to become a thing. Need some feedback if this is a way of handling your Configuration data in DSC. I will publish it to the PowershellGallery if people find it useful. Should probably do a code review as well since this was written over 2 years ago :-0.

Update 19.04.2014 - Module (beta) added to bitbucket here

When you start to work with DSC, you quickly realize that separating the infrastructure from the configuration is a huge benefit and somewhat of a curse. You start to read blogs and webposts explaining how you can specify the configurationdata to you configuration, however for the people that does not speak powershell (yes they are out there) and/or still don’t like it, it looks kind of “untidy”. Example:


Yes, Beelzebub has joined the party, pure evil. Just to explain ConfigurationData in Desired State Configuration:

It consists of two main elements:
  1. AllNodes (an array of all you nodes you want to configure)
  2. NonNodeData (an hashtable of properties that may or may not be related to any specific node)
So instead of the “rubbish” configdata variable above, we are going to do the same like this:

Import-Module DSCconfigdata

Add-DSCnode -Name Server1
Add-DSCnode -Name Server2

Add-DSCproperty -Name WinFeatures
Add-DSCproperty -Name SourceRoot
Add-DSCproperty -Name WebDirectory
Add-DSCproperty -Name RecurseValue

(Get-DSCNode -Name Server1).Role = "web"
(Get-DSCNode -Name Server1).WinFeatures = "web-server"
(Get-DSCNode -Name Server1).SourceRoot = "\\Server106\source\presentation\"
(Get-DSCNode -Name Server1).WebDirectory = "c:\inetpub\wwwroot\"
(Get-DSCNode -Name Server1).RecurseValue = $false

Add-DSCproperty -NonNodeData -Name DNSIPAddress -Value ""
Add-DSCproperty -NonNodeData -Name DNSName -Value ""
Add-DSCproperty -NonNodeData -Name SubnetMask -Value ""
Add-DSCproperty -NonNodeData -Name DNSIPAddress -Value ""

Should give you something like this:




The module have these methods:


The module also exports a variable called $configData. You may also use the function Get-DSCConfigData, the result is the same. 

One other nice feature is to allow clear text passwords in you MOF-files. Just use the Set-AllowClearTextPassword function to enable this (for all nodes or specific nodes). 

Of course if you just want to inspect the configuration for a node, use this:


So the module is still in development, however if you are keen on trying it, hit me up on twitter or post a comment.



Popular posts from this blog

Developing PowerShell modules for REST APIs – Part1

Over the years I have developed different PowerShell modules for different web APIs. I thought it would be a good idea to write a 2 series post about how you could go about to do this. This will be a 2 part blog series where we will run through the entire process of building a module for a REST API. I will try my best to keep this as simple as possible and leave more advanced stuff for a follow up post if the interest is there.What you needDepending on your experience with source control and PowerShell in general, you might want to use GIT or some other software repro for the code. In addition we are going to create a test REST API using the splendid UniversalDashboard PowerShell module created by Adam Driscoll. It is available on the PowershellGallery. Other prerequisites are built-in to Powershell. I will assume that you will be following along using at least PowerShell version 5 or greater.
What is HTTP metods for REST API.The primary or most common HTTP verbs used are POST, GET, PU…

Serialize data with PowerShell

Currently I am working on a big new module. In this module, I need to persist data to disk and reprocess them at some point even if the module/PowerShell session was closed. I needed to serialize objects and save them to disk. It needed to be very efficient to be able to support a high volume of objects. Hence I decided to turn this serializer into a module called HashData.

Other Serializing methods

In PowerShell we have several possibilities to serialize objects. There are two cmdlets you can use which are built in:
Both are excellent options if you do not care about the size of the file. In my case I needed something lean and mean in terms of the size on disk for the serialized object. Lets do some tests to compare the different types:


You might be curious why I do not use the Export-CliXML cmdlet and just use the [System.Management.Automation.PSSerializer]::Serialize static method. The static method will generate the same xml, however we …

Developing PowerShell modules for REST APIs – Part2

This is part 2 of the REST API blogpost. In part1 we successfully setup two REST API endpoints using the UniversalDashboard PowerShell module. In this part we are going to create a simple module that support some CRUD operation against our API. As we are trying to keep things as simple as possible, we will not use any fancy framework (like Plaster) to build our module. We are also going to skip a very important step you should familiarize yourself with, Pester tests. Lets get to it.

The moduleWe will build a module called FilesAPI. The module folder will look like this:

In the functions folder I have already added the 2 helper functions from part 1, Get-AuthorizationHeader and ConvertTo-Base64. The other folders are just placeholders for important stuff like classes, private functions that you do not want to make available for the module consumer and tests for Pester tests. For such a small module that we are going to create, one could argue that it is much easier to just add the functi…