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We're in the process of moving from NIS on our Linux systems to binding everything to Active Directory. The NIS environment follows the common standard used by many Linux distributions that a user's primary group is a group of the same name as the user (and of which the user is typically the only member).

I have been informed that in the Active Directory environment, you may not have a group name with the same name as a user (specifically, that no two AD security objects may have the same name). This would seem to complicate the process of moving our group definitions into AD. It looks like we could maintain the NIS group information in AD using only POSIX attributes (e.g., not an actual AD security object), but that seems like a suboptimal fix (because we do really want to have the same view of group membership in both the Unix and AD worlds).

Have you moved a large legacy NIS environment into Active Directory? How did you handle this situation?

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The groups have a grp- prepended to their sAMAccountName, but the cn is still the same. –  larsks Aug 2 '12 at 18:23
    
Did you ever solve this? I'm dealing with the same issue. –  JW. May 17 at 18:22
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1 Answer

Likewise has a product called The UID-GID Management Tool Module that can be used with Likewise Open to enhance your control over uid/gid mapping to Active Directory.

From the feature list:

Mirror your organizational units with Likewise cells and map Active Directory users and groups to UIDs and GIDs.

I have used Likewise Open and it works quite well but had no need to acquire this module.

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