How to Migrate a domain controller from Windows 2003 to Windows 2008?

reoroman
reoroman used Ask the Experts™
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How to Migrate a domain controller from Windows 2003 to Windows 2008 step by step.

I have windows server 2003 Enterprise R2 Sp2 32bit want to migrate AD/DC to windows 2008 Enterprise SP@ 32bit.

many thanks
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Sandesh DubeyTechnical Lead
Top Expert 2011

Commented:
The installation of Windows 2008 into the domain and migration is quite simple.
First you need to Adprep your 2003 Domain by running
adprep /forestprep    and
adprep /domainprep   and
adprep /gpprep

from the 2008 DVD on the Windows 2003 DC  - adprep is in the SOURCES folder on the DVD.

Next install 2008 server on the new machine. You need to assign the 2008 new computer an IP address and subnet mask on the existing network. Make sure that the preferred DNS server on new machine points to the existing DNS Server on the Domain (normally the existing domain controller)

Join the new 2008 machine to the existing domain as a member server

From the command line promote the new machine to a domain controller with the DCPROMO command from the command line Select "Additional Domain Controller in an existing Domain"

Once Active Directory is installed then to make the new machine a global catalog server, go to Administrative Tools, Active Directory Sites and Services, Expand, Sites, Default first site and Servers. Right click on the new server and select properties and tick the"Global Catalog" checkbox. (Global catalog is essential for logon as it needs to be queried to establish Universal Group Membership)

If necessary install DNS on the new server. Assuming that you were using Active Directory Integrated DNS on the first Domain Controller, DNS will automatically replicate to the new domain controller along with Active Directory. Set up forwarders as detailed at http://www.petri.co.il/configure_dns_forwarding.htm

You must transfer the FSMO roles to the 2008 machine then the process is as outlined at http://www.petri.co.il/transferring_fsmo_roles.htm

Change all of the clients (and the new 2008 DC itself), to point to the 2008 DC for their preferred DNS server .

You can then transfer any data to the new server

Before removing the old DC from the domain, run DCPROMO on it to remove Active Directory.

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