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The answer file that you use to create a new domain controller must have the replica options specified. Use the following procedure to create the answer file.

Administrative credentials

To perform this procedure, you can use any account that has Read and Write privileges for the text editor application.

1. Open Notepad or any text editor.

2. On the first line, type [DCINSTALL], and then press ENTER.

3. Create the following entries, one entry on each line. These options are the minimum options that are required for a new domain controller installation with DNS and the global catalog installed and configured automatically. For a complete list of unattended installation options, including default values, allowed values, and descriptions, see Promotion Operation.

   UserName=

   UserDomain=

   Password=

   ReplicaOrNewDomain=replica

   ReplicaDomainDNSName=

   DatabasePath=

   LogPath=

   SYSVOLPath=

   InstallDNS=yes

   ConfirmGC=yes

   SafeModeAdminPassword=

   RebootOnCompletion=yes

4. Save the answer file to the location on the installation server from which it is to be called by Dcpromo, or save the file to a network share or removable media for distribution.

After you create the answer file, use the following procedure to perform the unattended installation. Use this procedure to install AD DS on either a full installation of Windows Server 2008 or a Server Core installation of Windows Server 2008.

Administrative credentials

To perform this procedure, you must be a member of the Domain Admins group.

• At the command prompt, type the following, and then press ENTER:

  dcpromo /unattend:"path to the answer file"