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Kdr Kane 08-07-2006 11:47 AM

Group Membership Limitations
Here's what I hope is a pretty good question for those administrative experts out there.

What sets the group membership limitation for users on Unix/Linux systems?

I read one particular vendor's documentation that states that some flavors of operating systems have a maximum of 16 or 32 groups to which a user can be a member. I'd like to know what causes the difference. For example, is it a specification for PAM modules, file systems, Samba or the basic system utilities?

You may ask why would I need to know this? Because it's a limitation of interoperability with Windows Active Directory.

Windows AD has a soft limit of about 70-100 groups and that can be increased on the client to about 900 groups. This may be bad practice and I'm not arguing about it as I have no control over this.

This question I'm asking is a bit important to me because it's one of those tiny things that just bothers me about Linux standards. It would please me to no end if it is a standard that has been documented. I'm fairly knowledgeable about Linux but I've never seen any reference to this.

I hope I've been specific enough with my question. :)

Kdr Kane 08-23-2006 02:05 PM

Is this an invalid/bad question for this forum? Maybe somebody has a pointer to some other place?


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