# Inheritance in class based DSC resources. **URL:** \ **Category:** DSC\ **Created:** [June 16, 2016, 3:23pm UTC](https://forums.powershell.org/t/inheritance-in-class-based-dsc-resources/6648 "2016-06-16T15:23:41Z")\ **Posts on this page:** 15\ **Page:** 1
**Author:** ![luke-griffith](https://avatars.discourse-cdn.com/v4/letter/l/958977/32.png) [@luke-griffith](https://forums.powershell.org/u/luke-griffith)\ **Post date:** [June 16, 2016, 3:23pm UTC](https://forums.powershell.org/t/inheritance-in-class-based-dsc-resources/6648/1 "2016-06-16T15:23:41Z")
Hey all, I recently made a post about some of the problems I’ve encountered using the class based resources, wondered if anyone has a solution or have attempted this before? [http://www.lukegriffith.co.uk/powershell/dsc/2016/06/16/Limitations-of-class-based-dsc-providers.html](http://www.lukegriffith.co.uk/powershell/dsc/2016/06/16/Limitations-of-class-based-dsc-providers.html) ---
**Author:** ![nitin-gupta](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.powershell.org/nitin-gupta/32/344_2.png) [@nitin-gupta](https://forums.powershell.org/u/nitin-gupta)\ **Post date:** [June 20, 2016, 12:21pm UTC](https://forums.powershell.org/t/inheritance-in-class-based-dsc-resources/6648/2 "2016-06-20T12:21:37Z")
DSC Class based resources has no relation with DSC WMI resources and they are not supposed to be registered with WMI. Something else is going on here. From the error it appears that your target node either doesn’t have the module ‘inheritedResource’ installed or the version of the module installed is different than 1.0. Try the following to troubleshoot on your target node: 1. Get-DscResource -module inheritedResource –\> This should show DSC resource inheritedResource with module version 1.0 2. Import-Module inheritedResource -verbose If these two are working as expected, can you share your resource? ---
**Author:** ![luke-griffith](https://avatars.discourse-cdn.com/v4/letter/l/958977/32.png) [@luke-griffith](https://forums.powershell.org/u/luke-griffith)\ **Post date:** [June 22, 2016, 8:44am UTC](https://forums.powershell.org/t/inheritance-in-class-based-dsc-resources/6648/3 "2016-06-22T08:44:55Z")
Hey Nitin, Check out the GitHub project i linked on the blog post, [GitHub - lukegriffith/DSCInheritance: DSC resource superclass/subclass relationship.](https://github.com/lukemgriffith/DSCInheritance) That has the modules and the psake job that I ran. Following your steps it responds and works fine. ` PS wrk:> Get-DscResource -Module InheritedResource ImplementedAs Name ModuleName Version Properties * * * PowerShell InheritedResource InheritedResource 1.0 {Enforce, Ensure, SettingName, DependsOn…} PS wrk:> import-module InheritedResource -Verbose VERBOSE: Loading module from path ‘C:\Users\lukem\Documents\WindowsPowerShell\Modules\InheritedResource\InheritedResource.psd1’. VERBOSE: Loading module from path ‘C:\Users\lukem\Documents\WindowsPowerShell\Modules\InheritedResource\InheritedResource.psm1’. ` ---
**Author:** ![nitin-gupta](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.powershell.org/nitin-gupta/32/344_2.png) [@nitin-gupta](https://forums.powershell.org/u/nitin-gupta)\ **Post date:** [June 22, 2016, 11:50am UTC](https://forums.powershell.org/t/inheritance-in-class-based-dsc-resources/6648/4 "2016-06-22T11:50:51Z")
I tried this resource with the following test configuration on WMF 5.0 RTM build and it executed successfully. Are you using WMF 5.0 pre production or WMF 5.0 RTM? ``` configuration foo { param( [string] $settingsName ) import-dscresource -module InheritedResource $guidValue = [guid]::NewGuid() InheritedResource r1 { settingName=$settingsName guid=$guidValue Enforce= "Always" Ensure = "Present" } } foo -settingsName "NewSetting" PS C:\Users\duser1\Desktop> Start-DscConfiguration -path foo -wait -Verbose VERBOSE: Perform operation 'Invoke CimMethod' with following parameters, ''methodName' = SendConfigurationApply,'className' = MSFT_DSCLocalConfigurationManager,'namespaceName' = root/Microsoft/Windows/DesiredStateConfiguration'. VERBOSE: An LCM method call arrived from computer COM12R25RTM01 with user sid S-1-5-21-2800768176-829124343-4290817346-1106. VERBOSE: [COM12R25RTM01]: LCM: [Start Set] VERBOSE: [COM12R25RTM01]: LCM: [Start Resource] [[InheritedResource]r1] VERBOSE: [COM12R25RTM01]: LCM: [Start Test] [[InheritedResource]r1] VERBOSE: [COM12R25RTM01]: LCM: [End Test] [[InheritedResource]r1] in 0.1560 seconds. VERBOSE: [COM12R25RTM01]: LCM: [Skip Set] [[InheritedResource]r1] VERBOSE: [COM12R25RTM01]: LCM: [End Resource] [[InheritedResource]r1] VERBOSE: [COM12R25RTM01]: LCM: [End Set] VERBOSE: [COM12R25RTM01]: LCM: [End Set] in 0.4380 seconds. VERBOSE: Operation 'Invoke CimMethod' complete. VERBOSE: Time taken for configuration job to complete is 0.557 seconds` ``` ---
**Author:** ![luke-griffith](https://avatars.discourse-cdn.com/v4/letter/l/958977/32.png) [@luke-griffith](https://forums.powershell.org/u/luke-griffith)\ **Post date:** [June 22, 2016, 12:36pm UTC](https://forums.powershell.org/t/inheritance-in-class-based-dsc-resources/6648/5 "2016-06-22T12:36:55Z")
I’ve managed to test on both the below revisions. Major Minor Build Revision * * * 5 0 10586 117 Major Minor Build Revision * * * 5 0 10586 122 Originally I tested on a Win 10 machine, now testing on 2012 r2 core I’m getting a slightly different error. ` PS C:\Users\lukem\OneDrive\Documents\GitHub\DSCInheritance\> Invoke-psake -buildFile .\build.ps1 -taskList Integrate psake version 4.6.0 Copyright (c) 2010-2014 James Kovacs & Contributors cmdlet Get-Credential at command pipeline position 1 Supply values for the following parameters: Credential Executing Deploy Name Used (GB) Free (GB) Provider Root C * * * Target FileSystem \srv\c$\Program Files\WindowsPo… VERBOSE: Performing the operation “Copy Directory” on target “Item: C:\Users\lukem\OneDrive\Documents\GitHub\DSCInheritance\Modules Destination: \srv\c$\Program Files\WindowsPowerShell\Modules\Modules”. Copy-Item : An item with the specified name \srv\c$\Program Files\WindowsPowerShell\Modules\Modules already exists. At C:\Users\lukem\OneDrive\Documents\GitHub\DSCInheritance\build.ps1:34 char:9 - ``` Copy-Item -Path $_.FullName -Destination Target: -Verbose -R ... ``` - ``` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ``` - CategoryInfo : ResourceExists: (\srv\c$\Progra…Modules\Modules:String) [Copy-Item], IOException - FullyQualifiedErrorId : DirectoryExist,Microsoft.PowerShell.Commands.CopyItemCommand VERBOSE: Performing the operation “Copy Directory” on target “Item: C:\Users\lukem\OneDrive\Documents\GitHub\DSCInheritance\Modules\Base Destination: \srv\c$\Program Files\WindowsPowerShell\Modules\Modules\Base”. VERBOSE: Performing the operation “Create Directory” on target “Destination: \srv\c$\Program Files\WindowsPowerShell\Modules\Modules\Base”. VERBOSE: Performing the operation “Copy File” on target “Item: C:\Users\lukem\OneDrive\Documents\GitHub\DSCInheritance\Modules\Base\Base.psd1 Destination: \srv\c$\Program Files\WindowsPowerShell\Modules\Modules\Base\Base.psd1”. VERBOSE: Performing the operation “Copy File” on target “Item: C:\Users\lukem\OneDrive\Documents\GitHub\DSCInheritance\Modules\Base\Base.psm1 Destination: \srv\c$\Program Files\WindowsPowerShell\Modules\Modules\Base\Base.psm1”. VERBOSE: Performing the operation “Copy Directory” on target “Item: C:\Users\lukem\OneDrive\Documents\GitHub\DSCInheritance\Modules\InheritedResource Destination: \srv\c$\Program Files\WindowsPowerShell\Modules\Modules\InheritedResource”. VERBOSE: Performing the operation “Create Directory” on target “Destination: \srv\c$\Program Files\WindowsPowerShell\Modules\Modules\InheritedResource”. VERBOSE: Performing the operation “Copy File” on target “Item: C:\Users\lukem\OneDrive\Documents\GitHub\DSCInheritance\Modules\InheritedResource\InheritedResource.psd1 Destination: \srv\c$\Program Files\WindowsPowerShell\Modules\Modules\InheritedResource\InheritedResource.psd1”. VERBOSE: Performing the operation “Copy File” on target “Item: C:\Users\lukem\OneDrive\Documents\GitHub\DSCInheritance\Modules\InheritedResource\InheritedResource.psm1 Destination: \srv\c$\Program Files\WindowsPowerShell\Modules\Modules\InheritedResource\InheritedResource.psm1”. Executing Integrate LastWriteTime : 22/06/2016 18:59:46 Length : 2058 Name : srv.mof VERBOSE: Perform operation ‘Invoke CimMethod’ with following parameters, ‘‘methodName’ = SendConfigurationApply,‘className’ = MSFT\_DSCLocalConfigurationManager,‘namespaceName’ = root/Microsoft/Windows/DesiredStateConfiguration’. VERBOSE: An LCM method call arrived from computer SRV with user sid S-1-5-21-428108033-3095240199-1711482074-500. VERBOSE: [SRV]: LCM: [Start Set] VERBOSE: [SRV]: LCM: [End Set] Error: 22/06/2016 18:59:47: - ``` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ [] Exception: Importing module InheritedResource failed with error - The specified module 'Base' was not loaded because no valid module file was found in any module directory. ``` ` ---
**Author:** ![luke-griffith](https://avatars.discourse-cdn.com/v4/letter/l/958977/32.png) [@luke-griffith](https://forums.powershell.org/u/luke-griffith)\ **Post date:** [June 22, 2016, 12:41pm UTC](https://forums.powershell.org/t/inheritance-in-class-based-dsc-resources/6648/6 "2016-06-22T12:41:17Z")
Some output from SRV [srv]: PS C:\Users\Administrator\Documents\> Get-DscResource -Module InheritedResource ImplementedAs Name ModuleName Version Properties * * * PowerShell InheritedResource InheritedResource 1.0 {Enforce, Ensure, SettingName, Depend… [srv]: PS C:\Users\Administrator\Documents\> Get-Module -ListAvailable | ? {$_.Name -like “Inheri\*” -or $_.Name -eq “Base”} ``` Directory: C:\Program Files\WindowsPowerShell\Modules\Modules ``` ModuleType Version Name ExportedCommands * * * Script 1.0 Base Script 1.0 InheritedResource ---
**Author:** ![nitin-gupta](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.powershell.org/nitin-gupta/32/344_2.png) [@nitin-gupta](https://forums.powershell.org/u/nitin-gupta)\ **Post date:** [June 22, 2016, 12:46pm UTC](https://forums.powershell.org/t/inheritance-in-class-based-dsc-resources/6648/7 "2016-06-22T12:46:19Z")
I also tested it with version 5.0.10586.117, so at least we can do testing on similar environment. Can you try the sample I pasted using InheritedResource as that worked for me using the same build? If that works then can you share your generated mof file and I will try to find the root cause of this issue at my end. ---
**Author:** ![nitin-gupta](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.powershell.org/nitin-gupta/32/344_2.png) [@nitin-gupta](https://forums.powershell.org/u/nitin-gupta)\ **Post date:** [June 22, 2016, 12:48pm UTC](https://forums.powershell.org/t/inheritance-in-class-based-dsc-resources/6648/8 "2016-06-22T12:48:18Z")
Get-DScResource is supposed to show the resources from both InheritedResource and Base. Somehow it is not detecting the resources from Base. PowerShell Base Base 1.0 {Enforce, Ensure, guid, DependsO… PowerShell InheritedResource InheritedResource 1.0 {Enforce, Ensure, guid, SettingN… ---
**Author:** ![luke-griffith](https://avatars.discourse-cdn.com/v4/letter/l/958977/32.png) [@luke-griffith](https://forums.powershell.org/u/luke-griffith)\ **Post date:** [June 22, 2016, 12:52pm UTC](https://forums.powershell.org/t/inheritance-in-class-based-dsc-resources/6648/9 "2016-06-22T12:52:50Z")
Heres the MOF that i generated on revision 177. Something curious I’ve found, on Base i specifically chose not to export the DSC resource from the module, as it caused InheritedResource not to be discovered. I’ve just updated the psd1 for base to export the resource and now I cannot get InheritedResource from the Get-DscResource command. /\* @TargetNode=‘localhost’ @GeneratedBy=Administrator @GenerationDate=06/22/2016 19:01:47 @GenerationHost=SRV \*/ instance of InheritedResource as $InheritedResource1ref { ResourceID = “[InheritedResource]r1”; Enforce = “Always”; Ensure = “Present”; SourceInfo = “::10::2::InheritedResource”; SettingName = “NewSetting”; ModuleName = “InheritedResource”; ModuleVersion = “1.0”; ConfigurationName = “foo”; }; instance of OMI\_ConfigurationDocument ``` { ``` Version=“2.0.0”; ``` MinimumCompatibleVersion = "1.0.0"; CompatibleVersionAdditionalProperties= {"Omi_BaseResource:ConfigurationName"}; Author="Administrator"; GenerationDate="06/22/2016 19:01:47"; GenerationHost="SRV"; Name="foo"; }; ``` ---
**Author:** ![nitin-gupta](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.powershell.org/nitin-gupta/32/344_2.png) [@nitin-gupta](https://forums.powershell.org/u/nitin-gupta)\ **Post date:** [June 22, 2016, 1:00pm UTC](https://forums.powershell.org/t/inheritance-in-class-based-dsc-resources/6648/10 "2016-06-22T13:00:44Z")
On my machine both Base and InheritedResource are exporting DSC Resource and Get-DscResource is able to discover them. Let us make sure that I am using exactly same bits as yours for testing. ``` PS C:\Users\duser1\Desktop> dir C:\Windows\system32\DscCore.dll| select VersionInfo| fl * VersionInfo : File: C:\Windows\system32\DscCore.dll InternalName: DscCore.dll OriginalFilename: DscCore.dll.mui FileVersion: 10.0.10586.117 (th2_release.160212-2359) FileDescription: DSC Product: Microsoft® Windows® Operating System ProductVersion: 10.0.10586.117 Debug: False Patched: False PreRelease: False PrivateBuild: False SpecialBuild: False Language: English (United States) PS C:\Users\duser1\Desktop> $PSVersionTable Name Value ---- ----- PSVersion 5.0.10586.117 PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...} BuildVersion 10.0.10586.117 CLRVersion 4.0.30319.34003 WSManStackVersion 3.0 PSRemotingProtocolVersion 2.3 SerializationVersion 1.1.0.1 PS C:\Users\duser1\Desktop> Get-DscResource -Name in* ImplementedAs Name ModuleName Version Properties ------------- ---- ---------- ------- ---------- PowerShell InheritedResource InheritedResource 1.0 {Enforce, Ensure, guid, SettingN... PS C:\Users\duser1\Desktop> Get-DscResource -Name base ImplementedAs Name ModuleName Version Properties ------------- ---- ---------- ------- ---------- PowerShell Base Base 1.0 {Enforce, Ensure, guid, DependsO... ``` ---
**Author:** ![luke-griffith](https://avatars.discourse-cdn.com/v4/letter/l/958977/32.png) [@luke-griffith](https://forums.powershell.org/u/luke-griffith)\ **Post date:** [June 22, 2016, 1:01pm UTC](https://forums.powershell.org/t/inheritance-in-class-based-dsc-resources/6648/11 "2016-06-22T13:01:26Z")
Infact, my deploy script was wrong for this server. SRV has managed to run the DSC resource, so it looks like it potentially could be a problem with the 5.0.10586.122 release. ---
**Author:** ![nitin-gupta](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.powershell.org/nitin-gupta/32/344_2.png) [@nitin-gupta](https://forums.powershell.org/u/nitin-gupta)\ **Post date:** [June 22, 2016, 1:03pm UTC](https://forums.powershell.org/t/inheritance-in-class-based-dsc-resources/6648/12 "2016-06-22T13:03:50Z")
I will check on build 122 in a while and let you know my findings. ---
**Author:** ![luke-griffith](https://avatars.discourse-cdn.com/v4/letter/l/958977/32.png) [@luke-griffith](https://forums.powershell.org/u/luke-griffith)\ **Post date:** [June 22, 2016, 1:06pm UTC](https://forums.powershell.org/t/inheritance-in-class-based-dsc-resources/6648/13 "2016-06-22T13:06:20Z")
Thanks for your help. ---
**Author:** ![nitin-gupta](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.powershell.org/nitin-gupta/32/344_2.png) [@nitin-gupta](https://forums.powershell.org/u/nitin-gupta)\ **Post date:** [June 24, 2016, 1:21pm UTC](https://forums.powershell.org/t/inheritance-in-class-based-dsc-resources/6648/14 "2016-06-24T13:21:12Z")
Luke, it seems like you are copying modules in a non expected folder (notice extra _Modules_ in the path) [srv]: PS C:\Users\Administrator\Documents\> Get-Module -ListAvailable | ? {$_.Name -like “Inheri\*” -or $_.Name -eq “Base”} Directory: C:\Program Files\WindowsPowerShell\Modules\Modules ModuleType Version Name ExportedCommands ———- ——- —- —————- Script 1.0 Base Script 1.0 InheritedResource Can you try to copy the modules directly under Modules folder and try again. ---
**Author:** ![dotnVo](https://avatars.discourse-cdn.com/v4/letter/d/4af34b/32.png) [@dotnVo](https://forums.powershell.org/u/dotnVo)\ **Post date:** [May 16, 2024, 9:16pm UTC](https://forums.powershell.org/t/inheritance-in-class-based-dsc-resources/6648/15 "2024-05-16T21:16:54Z")