Max UID's on RHEL 3

[Wayne Pinette]

The following is nothing more than a guess and speculation :

<speculation type="mine">

It may be a throw back to the days when an int was 16 bit and userid's
were an unsigned int in the kernel (65535 being your largest uid).  I
seem to recall an annoyance/bug in the NeXT OS in which the userid was
defined as a signed int so the max uid was 32767, and nfs'ing between
NeXT and Sun could be
problematic if you had a userid of 44569, but I digress.  

If this is in fact nothing more than a throw back, and uid in the linux
kernel is now a long or unsigned long, then you will
be able to have userid's up to 2^31 -1 or 2^32 -1.  Im too lazy to
look, maybe someone else knows.

</speculation>

Other than that, I have no idea  :-).

Wayner


>>> Esquivelv at uhd.edu 07/04/06 12:13 pm >>>
I think I might have found the answer on my own, I tested my RHEL 3
server and I was able to increase the UID_MAX to almost any number I
wanted and I was able to create accounts.  The server kept on
automatically assigning UID's to the accounts and I was able to login
with the accounts just fine.  I got all the way up to like 12345678901
as a uid and it allowed me to assign it. 

Anyone have any input on this at all good or bad about huge amounts of
accounts on a server?

Thanks all

Vince 

> -----Original Message-----
> From: redhat-list-bounces at redhat.com 
> [mailto:redhat-list-bounces at redhat.com] On Behalf Of Esquivel,
Vicente
> Sent: Monday, July 03, 2006 10:57 PM
> To: General Red Hat Linux discussion list
> Subject: Max UID's on RHEL 3
> 
> Hello all,
>  
> Is it possible to have more then 60,000 UID's(user accounts) 
> assigned on a RHEL ES 3.0 system?  The systems by default has 
> a UID_MAX of 60,000 in the login.defs file.  Is it possible 
> to have more, if so how many is the true max?  What changes 
> would I have to make to the system to accept more?  I hope 
> someone can help as this is something we have run into and 
> need to try to fix promptly.  Any advice on this would be 
> greatly appreciated.
>  
> Thanks all in advance
>  
> Vince
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