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    Unattended Installation of Active Directory

    Posted on by Daniel Petri in Active Directory with 1 Comment

    How do I automatically upgrade a server to a domain controller during installation?

    You can automatically run DCPROMO during an unattended installation. Enter the command

    You’ll see a dialog box that says DCPROMO is running in unattended mode. Then, the machine will reboot.

    You can also add DCPROMO to the unattended file thats used to install your server.

    The Microsoft Windows 2000 Resource Kit details the DCInstall section’s parameters in the file Unattend.doc:

    Value Explanation
    AdministratorPassword The new password for the domain Administrator account
    AutoConfigDNS Specifies whether the wizard should configure DNS
    ChildName Name of the child part of the domain
    CreateOrJoin Specifies whether the domain will join an existing forest or create a new one
    DatabasePath Location for the Active Directory database
    DNSOnNetwork Used when a new forest of domains is installed and no DNS client is configured on the computer
    DomainNetBiosName NetBIOS name for the domain
    IsLastDCInDomain Only valid when demoting an existing domain controller to a member server
    LogPath Path for the Directory Service (DS) logs
    NewDomainDNSName Name of the new tree or when a new forest is created
    ParentDomainDNSName Specifies the name of the parent domain
    Password Password for the username used to promote the server
    RebootOnSuccess Specifies whether an automatic reboot should be performed
    ReplicaDomainDNSName Name of the domain to be replicated from
    ReplicaOrMember Specifies whether a Windows NT 4.0 or 3.51 BDC being upgraded should become a replica domain controller or be demoted to a regular member server
    ReplicaOrNewDomain Specifies whether the machine is a new domain controller in a new domain or a replica of an existing domain
    SiteName Name of the site (Default-First-Site by default)
    SysVolPath Path of SYSVOL
    TreeOrChild Specifies whether entry is a new tree or child of existing domain
    UserDomain Domain for the user being used in promotion
    UserName Name of the user performing the upgrade

    Because the DCPROMO process occurs after setup, the created answer file must be called $winnt$.inf and copied to the system32 folder. You need to add the following text to the GUIRunOnce section of the unattended Setup answer file:

    After the DCPROMO process completes, DCPROMO removes password information from the $winnt$.inf file. To make this process easier because the RunOnce command doesn’t execute until someone logs on to the computer, you can add the following text to the unattended answer file.

    [GUIUnattended] Autologon = yes ; automatically logs on the administrator account AutoLogoncount = n ; number of times to perform auto-admin logon

    Dont use items such as %systemroot% or %windir%, because the unattended installation process doesn’t understand them.

    You can just create a DCInstall section directly in your unattend.txt file to avoid having multiple unattended setup files. Enter text such as the following:

    My example script would create a new forest with the domain at the top and the new domain controller in the site Lab. The SYSVOL, logs, and Active Directory (AD) files would be in the default locations. The new domain Administrator account password would be password.


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