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Using resources with multiple versions
2016-05-16
powershell,DSC
article
eslesar
dongill
powershell

Using resources with multiple versions

Applies To: Windows PowerShell 5.0

In PowerShell 5.0, DSC resources can have multiple versions, and versions can be installed on a computer side-by-side. This is implemented by having multiple versions of a resource module that are contained in the same module folder.

Installing multiple resource versions side-by-side

You can use the MinimumVersion, MaximumVersion, and RequiredVersion parameters of the Install-Module cmdlet to specify which version of a module to install. Calling Install-Module without specifying a version installs the most recent version.

For example, there are multiple versions of the xFailOverCluster module, each of which contains an xCluster resouce. The result of calling Install-Module without specifying the version number is as follows:

C:\Program Files\WindowsPowerShell\Modules\xFailOverCluster> Install-Module xFailOverCluster
C:\Program Files\WindowsPowerShell\Modules\xFailOverCluster> Get-DscResource xCluster

ImplementedAs   Name                      ModuleName                     Version    Properties
-------------   ----                      ----------                     -------    ----------
PowerShell      xCluster                  xFailOverCluster               1.2.0.0    {DomainAdministratorCredential, ...

Now, if you call Install-Module again, but specify a RequiredVersion of 1.1.0.0, it results in the following:

C:\Program Files\WindowsPowerShell\Modules\xFailOverCluster> Install-Module xFailOverCluster -RequiredVersion 1.1
C:\Program Files\WindowsPowerShell\Modules\xFailOverCluster> Get-DscResource xCluster

ImplementedAs   Name                      ModuleName                     Version    Properties
-------------   ----                      ----------                     -------    ----------
PowerShell      xCluster                  xFailOverCluster               1.1        {DomainAdministratorCredential, Name, ...
PowerShell      xCluster                  xFailOverCluster               1.2.0.0    {DomainAdministratorCredential, Name, ...

Specifying a resource version in a configuration

If you have multiple resources installed on a computer, you must specify the version of that resource when you use it in a configuration. You do this by specifying the ModuleVersion parameter of the Import-DscResource keyword. If you fail to specify the version of a resource module of a resource of which you have more than one version installed, the configuration generates an error.

The following configuration shows how to specify the version of the resource to call:

configuration VersionTest
{
    Import-DscResource -ModuleName xFailOverCluster -ModuleVersion 1.1

    Node 'localhost'
    {
       xCluster ClusterTest
       {
            Name                          = 'TestCluster'
            StaticIPAddress               = '10.0.0.3'
            DomainAdministratorCredential = Get-Credential
        }
     }
}

Note: The ModuleVersion parameter of Import-DscResource is not available in PowerShell 4.0. In PowerShell 4.0, you can specify a module version by passing a module specification object to the ModuleName parameter of Import-DscResource. A module specification object is a hash table that contains ModuleName and RequiredVersion keys. For example:

configuration VersionTest
{
    Import-DscResource -ModuleName (@{ModuleName='xFailOverCluster'; RequiredVersion='1.1'} )

    Node 'localhost'
    {
       xCluster ClusterTest
       {
            Name                          = 'TestCluster'
            StaticIPAddress               = '10.0.0.3'
            DomainAdministratorCredential = Get-Credential
        }
     }
}

This will also work in PowerShell 5.0, but it is recommended that you use the ModuleVersion parameter.

See also