Max UID's on RHEL 3
Esquivel, Vicente
Esquivelv at uhd.edu
Wed Jul 5 13:59:23 UTC 2006
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 at redhat.com
> [mailto:redhat-list-bounces at 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 at redhat.com
> > [mailto:redhat-list-bounces at redhat.com] On Behalf Of Wayne Pinette
> > Sent: Tuesday, July 04, 2006 2:23 PM
> > To: redhat-list at 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 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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