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RE: Max UID's on RHEL 3



The official word I received from Red Hat was that the max for UID's is
2.1 billion as of RHEL 2.  They did add that there are only a few
applications out there that will only accept UID's up to 1 million.

Vince

> -----Original Message-----
> From: redhat-list-bounces redhat com 
> [mailto:redhat-list-bounces redhat com] On Behalf Of Esquivel, Vicente
> Sent: Wednesday, July 05, 2006 8:38 AM
> To: General Red Hat Linux discussion list
> Subject: RE: Max UID's on RHEL 3
> 
> Thanks for the reply, I see what you mean in saying that it 
> might have been like that.  Which is what prompted my 
> question because I wasn't sure if it had changed now.  
> 
> Anyone else have any input?
> 
> Vince 
> 
> > -----Original Message-----
> > From: redhat-list-bounces redhat com
> > [mailto:redhat-list-bounces redhat com] On Behalf Of Wayne Pinette
> > Sent: Tuesday, July 04, 2006 2:23 PM
> > To: redhat-list redhat com; Esquivel, Vicente
> > Subject: RE: Max UID's on RHEL 3
> > 
> > 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 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 redhat com 
> > > [mailto:redhat-list-bounces 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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