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Exam Tip
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WMI works within the context of a namespace, the default being root\cli (MSFT_cli in the XSL stylesheet) that controls what properties, methods (verbs), and aliases are available in WMI. You can add aliases, methods, and properties if necessary (put on your programming hat), but the list is robust enough for most monitoring tasks. Security for WMI is configured through the WMI Control snap-in (Wmimgmt.msc), in the WMI MMC. By default, users have permissions to read WMI provider information through WMIC on a local computer, but do not have permission to connect remotely or write information outside of the provider context. Administrators who want to grant additional permissions to a user or group must do so through the WMI Control snap-in.
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Lesson 4
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Using the WMI Event Logging Provider
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12-27
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WMIC Aliases The first parameter of a WMIC command line is the alias. The alias name must be unique in the WMI namespace schema, and provides access to WMI information without needing to remember more complex schema objects and properties. Table 12-2 lists the properties associated with each alias instance. The complete alias and namespace lists, and other detailed information about WMIC aliases, can be found in Windows Server 2003 Help and Support: Alias Namespaces and Classes.
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Table 12-2
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WMIC Aliases
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Description The name of the alias; it must be unique. A description of the alias. This is the descriptive text when / is entered at the WMIC command line. A list, each of which has a name and a list of properties (objects of the class MSFT_CliProperty) to be displayed for that format. All formats are objects of the class MSFT_CliFormat. A list, each of which are the various behaviors available through this alias. The behaviors come in two forms: Standard verbs, which are directly supported by the utility. User-defined verbs, which must map to some method defined for the target of the alias. All verbs are objects of the class MSFT_CliVerb. A list, similar to WMI qualifiers. All qualifiers are objects of the class MSFT_Qualifier. A list, similar to WMI qualifiers. All qualifiers are objects of the class MSFT_Qualifier. Optional WHERE clause that limits the Target. It has substitution values which are the parameters of the alias. The substitution values are marked with #. If multiple parameters are needed, they are matched with the # markers in sequence. Details on which computers to connect to, the security details to be used, and so on. If a connection is not specified, the computers to be accessed are the value of /NODE, and the namespace is the value of /NAMESPACE. If a user name and password are not provided, then the value of /USER and /PASSWORD, if available, is used (otherwise the current account is used). Use a metaalias Alias to view an alias schema; example: ALIAS OS.
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Property FriendlyName Description Formats
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Verbs
Qualifiers Target PWhere clause
Connection
View an alias schema
WMIC Verbs Most aliases have actions that they perform: these actions are initiated by issuing a verb along with the alias. In combination with parameters and switches, these alias-verb combinations control what configuration is set within the application or sys tem, or what information is read from the WMI Repository. Table 12-3 lists the key verbs used in monitoring and their descriptions. The complete verbs list, and other
12-28
12
Monitoring Microsoft Windows Server 2003
detailed information about WMIC verbs, can be found in Windows Server 2003 Help and Support: WMIC Verbs.
Table 12-3
WMIC Verbs
Parameters Method and parameter list if appropriate. Parameter lists are comma delimited. Use SERVICE CALL / to get a list of available methods and their parameters for the current alias. Property name or switch LIST is the default verb. There are many switches and adverbs that can be used with the LIST verb (example: BRIEF) Example SERVICE WHERE CAPTION='TELNET' CALL STARTSERVICE
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