Our answer file we can create on an existing DC, for example a W2K3 domain controller.
1. insert the W2K3 installation CD/DVD in your machine and extract the file ref.chm which is located in \SUPPORT\TOOLS\DEPLOY.CAB and select a destination
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2. open the ref.chm file, click on Unattend.txt, then click on [DCInstall], scroll down to the example and copy this to a notepad.
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3. adjust the answer file to your needs. Look for more information in the ref.chm file.
4. run adprep /forestprep on the installed DC to prepare the forest for a new DC. This can be found on the W2K8 installation DVD under Sources\ADprep. It should look something like this:
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5. next is the domainprep
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6. copy the file to your W2K8 core and run Dcpromo /unattend:unattendfile to start the promotion to DC
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7. restart the server to apply the changes with the command shutdown /r /t 0
8. check on your original DC the Active Directory Users and Computers to see if your servre is now a domain controller
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In this scenario, I've promoted my W2K8 core to a DC in an existing domain. Of course the same procedure can be applied to create a new domain or even forest.
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