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ConfigurationName https://msdn.microsoft.com/powershell/dsc/pullclientconfignames ConfigurationID https://msdn.microsoft.com/powershell/dsc/pullclientconfigid To demonstrate partial configuration, the following example features an environment with a pull server (DemoServerWin10). There are also two configurations, each deployed to one of the pull servers. The LCM of a destination machine is configured with these two pull servers and configurations. The LCM configuration applied to the server named DemoServerWin is shown in the following: [DSCLocalConfigurationManager()] Configuration ChangeLCMProperties { Node DemoServerWin { Settings { RebootNodeIfNeeded = $true RefreshMode = "Pull" ConfigurationMode = "ApplyAndAutoCorrect" ConfigurationID = "fcd03a8d-5a64-4982-92b3-5c89680add39" } ConfigurationRepositoryWeb PullServer1 { ServerURL = "http://demoserverwin10:8080/PSDSCPullServer.svc/" AllowUnsecureConnection = $true } PartialConfiguration IISInstall { Description = 'Configuration for IIS Web Server' ConfigurationSource = '[ConfigurationRepositoryWeb]PullServer1' } } } PartialConfiguration IndexFile { Description = 'Configuration for Index File' ConfigurationSource = '[ConfigurationRepositoryWeb]PullServer1' DependsOn = '[PartialConfiguration]IISInstall' } ChangeLCMProperties -OutputPath "C:\DSC" Set-DscLocalConfigurationManager -Path "C:\DSC" Assuming that the pull servers are already available on the mentioned servers, you must change the LCM Meta Configuration settings on all servers that will participate and pull configurations from them. The preceding configuration sample has a node section named DemoServerWin. It signifies that the configuration modifies the LCM configuration of DemoServerWin. The attribute DSCLocalConfigurationManager mandates that only resources applicable for LCM Meta Configuration can be used in this configuration and that this is a Meta Configuration that will output a .meta.mof file. General resources cannot be used in such configurations. Using this attribute is the way to indicate to DSC that this configuration relates to LCM configuration. The Settings resource is configured with the RefreshMode property set to Pull, the ConfigurationMode property set to ApplyandAutoCorrect, the ConfigurationID property set to fcd03a8d-5a64-4982-92b3- 5c89680add39, and the RebootNodeIfNeeded property set to True. LCM downloads configuration files from the pull server whose name has the same GUID as that assigned to the ConfigurationID. LCM would download configuration files with fcd03a8d-5a64-4982-92b3-5c89680add39 in their names from the pull server in the case of the preceding example. 148 CHAPTER 5 | Systems management
You also need to provide the pull server details to LCM. In LCM v2, you can do so by using the WebConfigurationRepository resource. There can be multiple pull servers (WebConfigurationRepository resources) defined in a configuration. In the previous sample, two pull servers are defined: PullServer1 with server URL http://demoserverwin:8080/ PSDSCPullServer.svc/ and AllowUnsecureConnection set to True, and PullServer2 with server URL http://Demoserverwin10:8090/PSDSCPullServer.svc/ and AllowUnsecureConnection set to True. Although this example shows a property called AllowUnsecureConnection, and setting it to True allows LCM to request configuration on HTTP protocol instead of HTTPS protocol, we strongly recommend that you use HTTPS in normal operating environments. The PartialConfiguration resource defines configuration fragments. Two partial configurations, IISInstall and IndexFile, are defined. IISInstall configuration is available on PullServer1, whereas IndexFile configuration is available on PullServer2. Important to note are the names of the partial configurations because they should exactly match the names of the configurations on the pull server. The next section will show that the IISInstall configuration is authored and available on PullServer1 and the IndexFile configuration is available on PullServer1. The ConfigurationSource property attaches the pull server to the partial configuration. Also, note that the pull server URL, ConfigurationID, and Configuration Name combined provide the LCM with complete information to uniquely identify the configuration on the pull server. The LCM cannot pull partial configurations if any of these three pieces of information is missing. The configuration previously shown generates the DemoServerWin.meta.mof file at the C:\DSC folder location. You use the Set-DSCLocalConfigurationManager cmdlet to push and apply the .mof file to DemoServerWin. Authoring the configurations Next, we examine authoring the configurations that will participate in partial configuration. In this section, two configurations, IISInstall and IndexFile, are authored. IISInstall configuration This is a simple configuration responsible for installing IIS (Web-Server) on a server using the WindowsFeature resource. Running the configurations in this section and the next one generates .mof files. The configuration script in our sample that follows runs on server ServerWin10. The name of the .mof file is same as the node name defined in the configuration script. Configurations participating in partial configurations have a special naming requirement. They must use the ..mof format. The configuration shown in the following sample uses ConfigurationData (data structure for passing values to configuration script) to define the name of the node. $AllNodes.NodeName retrieves all the node names from the configuration data, which in this case is only one because there is just one NodeName. IISInstall.fcd03a8d-5a64-4982- 92b3-5c89680add39.MOF is generated from the following script: $ConfigInfoIIS = @{ AllNodes = @( @{ NodeName = "IISInstall.fcd03a8d-5a64-4982-92b3-5c89680add39" } ) } Configuration IISInstall { Node $AllNodes.NodeName { WindowsFeature IIS { Name = "Web-server" Ensure = "Present" } 149 CHAPTER 5 | Systems management
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