Functions/Start-DscPullConfiguration.ps1
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# Copyright 2012 Aaron Jensen # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. function Start-DscPullConfiguration { <# .SYNOPSIS Performs a configuration check on a computer that is using DSC's Pull refresh mode. .DESCRIPTION The most frequently a computer's LCM will download new configuration is every 15 minutes; the most frequently it will apply it is every 30 minutes. This function contacts a computer's LCM and tells it to apply and download its configuration immediately. If a computer's LCM isn't configured to pull its configuration, an error is written, and nothing happens. If a configuration check fails, the errors are retrieved from the computer's event log and written out as errors. The `Remote Event Log Management` firewall rules must be enabled on the computer for this to work. If they aren't, you'll see an error explaining this. The `Get-DscError` help topic shows how to enable these firewall rules. Sometimes, the LCM does a really crappy job of updating to the latest version of a module. `Start-DscPullConfiguration` will delete modules on the target computers. Specify the names of the modules to delete with the `ModuleName` parameter. Make sure you only delete modules that will get installed by the LCM. Only modules installed in the `$env:ProgramFiles\WindowsPowerShell\Modules` directory are removed. `Start-DscPullConfiguration` is new in Carbon 2.0. .LINK Get-DscError .LINK Initialize-Lcm .LINK Get-DscWinEvent .EXAMPLE Start-DscPullConfiguration -ComputerName '10.1.2.3','10.4.5.6' Demonstrates how to immedately download and apply a computer from its pull server. .EXAMPLE Start-DscPullConfiguration -ComputerName '10.1.2.3' -Credential (Get-Credential domain\username) Demonstrates how to use custom credentials to contact the remote server. .EXAMPLE Start-DscPullConfiguration -CimSession $session Demonstrates how to use one or more CIM sessions to invoke a configuration check. .EXAMPLE Start-DScPullConfiguration -ComputerName 'example.com' -ModuleName 'Carbon' Demonstrates how to delete modules on the target computers, because sometimes the LCM does a really crappy job of it. #> [CmdletBinding(DefaultParameterSetName='WithCredentials')] param( [Parameter(Mandatory=$true,ParameterSetName='WithCredentials')] [string[]] # The credential to use when connecting to the target computer. $ComputerName, [Parameter(ParameterSetName='WithCredentials')] [PSCredential] # The credentials to use when connecting to the computers. $Credential, [Parameter(ParameterSetName='WithCimSession')] [Microsoft.Management.Infrastructure.CimSession[]] $CimSession, [string[]] # Any modules that should be removed from the target computer's PSModulePath (since the LCM does a *really* crappy job of removing them). $ModuleName ) Set-StrictMode -Version 'Latest' Use-CallerPreference -Cmdlet $PSCmdlet -Session $ExecutionContext.SessionState $credentialParam = @{ } if( $PSCmdlet.ParameterSetName -eq 'WithCredentials' ) { if( $Credential ) { $credentialParam.Credential = $Credential } $CimSession = New-CimSession -ComputerName $ComputerName @credentialParam if( -not $CimSession ) { return } } $CimSession = Get-DscLocalConfigurationManager -CimSession $CimSession | ForEach-Object { if( $_.RefreshMode -ne 'Pull' ) { Write-Error ('The Local Configuration Manager on ''{0}'' is not in Pull mode (current RefreshMode is ''{1}'').' -f $_.PSComputerName,$_.RefreshMode) return } foreach( $session in $CimSession ) { if( $session.ComputerName -eq $_.PSComputerName ) { return $session } } } if( -not $CimSession ) { return } # Get rid of any _tmp directories you might find out there. Invoke-Command -ComputerName $CimSession.ComputerName @credentialParam -ScriptBlock { $modulesRoot = Join-Path -Path $env:ProgramFiles -ChildPath 'WindowsPowerShell\Modules' Get-ChildItem -Path $modulesRoot -Filter '*_tmp' -Directory | Remove-Item -Recurse } if( $ModuleName ) { # Now, get rid of any modules we know will need to get updated Invoke-Command -ComputerName $CimSession.ComputerName @credentialParam -ScriptBlock { param( [string[]] $ModuleName ) $dscProcessID = Get-WmiObject msft_providers | Where-Object {$_.provider -like 'dsccore'} | Select-Object -ExpandProperty HostProcessIdentifier Stop-Process -Id $dscProcessID -Force $modulesRoot = Join-Path -Path $env:ProgramFiles -ChildPath 'WindowsPowerShell\Modules' Get-ChildItem -Path $modulesRoot -Directory | Where-Object { $ModuleName -contains $_.Name } | Remove-Item -Recurse } -ArgumentList (,$ModuleName) } # Getting the date/time on the remote computers so we can get errors later. $win32OS = Get-CimInstance -CimSession $CimSession -ClassName 'Win32_OperatingSystem' $results = Invoke-CimMethod -CimSession $CimSession ` -Namespace 'root/microsoft/windows/desiredstateconfiguration' ` -Class 'MSFT_DscLocalConfigurationManager' ` -MethodName 'PerformRequiredConfigurationChecks' ` -Arguments @{ 'Flags' = [uint32]1 } $successfulComputers = $results | Where-Object { $_ -and $_.ReturnValue -eq 0 } | Select-Object -ExpandProperty 'PSComputerName' $CimSession | Where-Object { $successfulComputers -notcontains $_.ComputerName } | ForEach-Object { $session = $_ $startedAt= $win32OS | Where-Object { $_.PSComputerName -eq $session.ComputerName } | Select-Object -ExpandProperty 'LocalDateTime' Get-DscError -ComputerName $session.ComputerName -StartTime $startedAt -Wait } | Write-DscError } |