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The following is a typical implementation of a Meta Configuration property configuration in LCM v2: [DSCLocalConfigurationManager()] Configuration ChangeLCMProperties { Node DemoServerWin { Settings { AllowModuleOverwrite = $false RebootNodeIfNeeded = $true RefreshMode = "Pull" ConfigurationMode = "ApplyAndAutoCorrect" ConfigurationID = "fcd03a8d-5a64-4982-92b3-5c89680add39" } ConfigurationRepositoryWeb PullServer1 { } ServerURL = "http://demoserverwin10:8090/PSDSCPullServer.svc/" AllowUnsecureConnection = $true ConfigurationRepositoryWeb PullServer2 { ServerURL = "http://demoserverwin10:8080/PSDSCPullServer.svc/" AllowUnsecureConnection = $true } ReportServerWeb ComplianceServer { } ServerURL = "http://demoserverwin10:8000/PSDSCComplianceServer.svc/" AllowUnsecureConnection = $true } } PartialConfiguration IISInstall { Description = 'Configuration for IIS Web Server' ConfigurationSource = '[ConfigurationRepositoryWeb]PullServer1' } PartialConfiguration IndexFile { Description = 'Configuration for Index File' ConfigurationSource = '[ConfigurationRepositoryWeb]PullServer2' DependsOn = '[PartialConfiguration]IISInstall' } ChangeLCMProperties -OutputPath "C:\DSC" Set-DscLocalConfigurationManager -Path "C:\DSC" The preceding script is similar to general DSC configuration with the configuration named ChangeLCMProperties but including the defined DSCLocalConfigurationManager attribute. This attribute mandates that all resources within the configuration should be related to LCM only and should be present on configurations related to LCM. An error results if other general resources are used in the configuration. The script contains one node section for the DemoServerWin server. The Settings resource is the main resource for setting the LCM properties. In this example, we are specifying some of its properties and assigning values to them. For example, the refresh mode is set to Pull so that the machine should restart (when required by a resource); the configuration mode has been changed to ApplyandAutoCorrect, and ConfigurationID has been provided with a valid GUID. The configuration as represented by the GUID would be pulled from the pull server. There are two pull servers in this configuration denoted by PullServer1 and PullServer2. The ServerURL property shows that they are on the same server with different port numbers. Also, AllowUnsecureConnection makes it possible to use HTTP instead of HTTPS protocol. Compliance server information is also provided by using ReportServerWeb. There are two partial configurations set to be downloaded by LCM and applied as a single configuration on its server. Partial Configuration 144 CHAPTER 5 | Systems management
IISInstall is responsible for downloading a configuration named IISInstall from PullServer1. Partial Configuration IndexFile is responsible for downloading a configuration named IndexFile from PullServer2. Moreover, running the partial configuration IndexFile depends on the completion of the configuration IISInstall as represented by the DependsOn property. Only after the IISInstall configuration is applied can the IndexFile configuration run. After the configuration is defined, it runs to generate the .mof file (DemoServerWin.Meta.mof) at C:\DSC. The folder location has been explicitly provided by using the OutputPath parameter. After the .mof file is generated, the Set-DSCLocalConfigurationManager cmdlet is used to push and apply the .mof file to the DemoServerWin server. When the configuration is applied, LCM on the server DemoServerWin is configured to pull partial configurations from multiple pull servers and apply them periodically. Next,you can read the new configuration again by using Get-DSCLocalConfigurationManager, as shown in the following example: PS C:\Users\me> Get-DscLocalConfigurationManager ActionAfterReboot : ContinueConfiguration AgentId : C8F7308B-6E6D-11E6-899F-B4AE2BEB7DE5 AllowModuleOverWrite : False CertificateID : ConfigurationDownloadManagers : {[ConfigurationRepositoryWeb]PullServer1, [ConfigurationRepositoryWeb]PullServer2} ConfigurationID : fcd03a8d-5a64-4982-92b3-5c89680add39 ConfigurationMode : ApplyAndAutoCorrect ConfigurationModeFrequencyMins : 15 Credential : DebugMode : False DownloadManagerCustomData : DownloadManagerName : LCMCompatibleVersions : {1.0, 2.0} LCMState : Ready LCMVersion : 2.0 MaximumDownloadSizeMB : 500 StatusRetentionTimeInDays : 7 PartialConfigurations : {[PartialConfiguration]IISInstall, [PartialConfiguration]IndexFile} RebootNodeIfNeeded : True RefreshFrequencyMins : 30 RefreshMode : PULL ReportManagers : [ReportServerWeb]ComplianceServer ResourceModuleManagers : {} PSComputerName : In the preceding code block, the ConfigurationDownloadManagers property is filled with two values representing two pull servers: PartialConfigurations has two values represented by the IISInstall and IndexFile configurations, and ReportManagers has a value of ComplianceServer. New methods in LCM There are three new methods in LCM v2: GetConfigurationStatus, GetConfigurationResultOutput, and SendConfigurationApplyAsync. Let's examine these briefly. GetConfigurationStatus The GetConfigurationStatus method retrieves the current status of configuration for a server. The new DSC cmdlet Get-DSCConfigurationStatus invokes the CIM method. The following code shows an example of Get-DSCConfigurationStatus: PS C:\> $cimsession = New-CimSession -ComputerName DemoServerWin10 PS C:\> Get-DscConfigurationStatus -CimSession $cimsession Status StartDate Type Mode RebootRequested NumberOfConfigurationResources PSComputerName ------ --------- ---- ---- --------------- ------------------------------ -------------- 145 CHAPTER 5 | Systems management
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