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DSC Local Configuration Manager



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9780735697744 Introducing Windows Server 2016 pdf

DSC Local Configuration Manager 
One key component of DSC is Local Configuration Manager (LCM), the DSC engine responsible for 
processing and enacting configuration documents (.mof files). 
LCM accepts (push mode), retrieves (pull mode), applies, monitors, compares, reports the drifts, and 
applies (or reapplies) the configuration documents. Needless to say, LCM is the heart and brain of 
DSC. 
Windows Server 2016 comes preinstalled with Windows Management Framework 5.1 and DSC. DSC 
was introduced with Windows Management Framework 4.0 (also available for download for earlier 
Windows Versions) and came preinstalled in Windows Server 2012 R2 and Windows 8.1. As you might 
expect, Windows Management Framework 5.1 introduces many new features and changes to DSC 
and LCM. 
You can configure LCM and the DCS engine by applying a Meta Configuration document (meta.mof). 
The behavior and actions of LCM can be influenced and controlled by modifying Meta Configuration 
properties. 
DSC v2 in Windows Server 2016 builds on the previous version, deprecating a few LCM properties and 
offering newer cmdlets for managing configurations, a newer LCM with additional functionality, newer 
Meta Configuration attributes, and new features such as partial configurations and cross-machine 
synchronization. 
LCM is implemented as a Common Information Model (CIM) class 
MSFT_DSCLocalConfigurationManager within the root\Microsoft\Windows\DesiredStateConfiguration 
namespace. 
In this section, we look into the newer functionality and workings of LCM v2 on Windows Server 2016. 
DSC provides two cmdlets for accessing LCM and viewing and updating the LCM properties: Get-
DSCLocalConfigurationManager for viewing and Set-DSCLocalConfigurationManager for setting. 
Running Get-DSCLocalConfigurationManager on the Windows Server 2016 Windows PowerShell 
console lists all LCM Meta Configuration properties along with their current values. The default values 
are shown in the following output: 
PS C:\> Get-DscLocalConfigurationManager 
ActionAfterReboot : ContinueConfiguration 
AgentId : C8F7308B-6E6D-11E6-899F-B4AE2BEB7DE5 
AllowModuleOverWrite : False 
CertificateID : 
ConfigurationDownloadManagers : {} 
ConfigurationID : 
ConfigurationMode : ApplyAndMonitor 
ConfigurationModeFrequencyMins : 15 


142 
CHAPTER 5 | Systems management 
Credential : 
DebugMode : {NONE} 
DownloadManagerCustomData : 
DownloadManagerName : 
LCMCompatibleVersions : {1.0, 2.0} 
LCMState : Idle 
LCMStateDetail : 
LCMVersion : 2.0 
StatusRetentionTimeInDays : 10 
SignatureValidationPolicy : NONE 
SignatureValidations : {} 
MaximumDownloadSizeMB : 500 
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