Maximum UID and GID

[SGK]

Hi,

What is maximum number for UID and GID for Redhat Linux and OpenBSD?

TIA.

[Alexander Chuzhoy · Accepted solution]

Maximum recommended is: 65535
But the maximum allowable uid/gid is:
4294967295

[Alexander Chuzhoy]

True for Redhat and FreeBSD.

[SGK]

Is it same for OpenBSD?

[Alexander Chuzhoy]

Never worked on this distribution.
I suggest you to create a user there and to play with it:
first try to assign it the mentioned UID - in case it works -try a bigger one.
Anyway - I wouldn't recommend you to work with something that isn't recommended by the system (obviously).
Cheers.

[Steven E. Protter]

Shalom,

I believe this is a System V convention.

Its time to test it though, it will do no harm creating a dummy user and editing /etc/passwd and /etc/group for test purposes.

SEP

[SGK]

Hi,

I think the Maximum UID/GID for OpenBSD is 2147483647. I tried the following steps in OpenBSD:

# groupadd -g 42949672950 testgrp
# more /etc/group
testgrp:*:2147483647:

# useradd -g testgrp -u 42949672950 testusr
# more /etc/passwd
testusr:*:2147483647:2147483647::/home/testusr:/bin/csh

Based on the above result, I guess its 2147483647.

Correct?

[Alexander Chuzhoy]

I'd assume so.

Best regards.

[Stuart Browne]

*chuckles* they signed the longint :P

[Ryan Goh]

In Red Hat Enterprise Linux 2.1 and later versions the Linux kernel supports 32 bit limits for the UID and GID. The UID and GID are stored internally as signed integer values, so there are 31 bits available to store UID's and GID's. This results in a system limit of 2,147,483,648.

For full info, go to http://kbase.redhat.com/faq/FAQ_80_6231.shtm