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IDS Forum

RE: RE: RE: RE: I have a puzzling situation

Posted By: John Adamski
Date: Wednesday, 7 November 2012, at 4:24 p.m.

In Response To: Re: RE: RE: RE: I have a puzzling situation (Art Kagel)

Art

I'm on HPUX so the first command won't work on my system, the second returned:

adamski cars: getconf NGROUPS_MAX
20

I did checked and the two users that have the problem are the only two that have more than 20 groups. I have two other people at 20 and one at 19. So I think I need to look at increasing the ngroup_max.

HP man page on ngroups_max give a big long warning about changing it as might cause problems with older applications. How lovely.

John

-----Original Message-----
From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of Art Kagel
Sent: Wednesday, November 07, 2012 1:02 PM
To: ids@iiug.org
Subject: Re: RE: RE: RE: I have a puzzling situation [28730]

John:

What does "cat /proc/sys/kernel/ngroups_max" return?

What does "getconf NGROUPS_MAX" return?

I did a search on the web and it looks like you have to get the glibc source, modify limits.h, recompile glibc to create a .a library and a .so shared library and install them. You will likely have to restart the Informix engine after that to pick up the updated library. You can verify whether the oninit process was linked to the dynamic version of glibc using "ldd $INFORMIXDIR/bin/oninit" to see if the libc.so is being linked at runtime and which version your environment's search path (LD_LIBRARY_PATH) is seeing.

Supposedly this limit was raised in kernels 2.6.3 and later to 64,535. I have access to an RHEL5 machine and it reports 65535 from both /proc and getconf. So maybe the best/easiest fix will be to upgrade your OS or at least the kernel and glibc.

Art

Art S. Kagel
Advanced DataTools (www.advancedatatools.com)
Blog: http://informix-myview.blogspot.com/

Disclaimer: Please keep in mind that my own opinions are my own opinions and do not reflect on my employer, Advanced DataTools, the IIUG, nor any other organization with which I am associated either explicitly, implicitly, or by inference. Neither do those opinions reflect those of other individuals affiliated with any entity with which I am affiliated nor those of the entities themselves.

On Wed, Nov 7, 2012 at 12:18 PM, John Adamski <adamski@graceland.edu> wrote:

> Art & Jacques
>
> I checked the two known people that have this problem the first sury
> who I've been testing with has 21 groups the other has 22 groups (i.e.
> in 21/22 groups in /etc/group).
>
> Our EPR uses these groups to setup the Informix table permissions.
> Since sury is our head cashier and the other the head accountant I can
> see why they are in so many groups. I removed sury from one of the
> groups on the TEST/DR server she was in and re-ran the procedure and -
> poof it worked.
>
> So we found the cause. Yaaaaaaah!!
>
> I will now go check all users as I'm sure we have more than the two
> identified so far with more than 20 groups.
>
> Now the 64 thousand dollar question, how do I fix it. :-) I doubt I
> will be able to get rid of the groups on production server for this
> user, so will need a way to have more than 20 groups tied to a user. I
> will have to first review with the developers and see if we can do
> something about the number of groups.
>
> John
>
> -----Original Message-----
> From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of
> Art Kagel
> Sent: Wednesday, November 07, 2012 10:36 AM
> To: ids@iiug.org
> Subject: Re: RE: RE: RE: I have a puzzling situation [28727]
>
> Jacques, John:
>
> NGROUPS_MAX refers to the maximum length of the list of supplemental
> group ids that a process can belong to concurrently not the maximum
> group number or the number of groups defined per system.
>
> However, it may be that the users that fail are members of more than
> 20 supplemental groups (groups other than its primary group listed in
> /etc/passwd) while the ones that work are members of fewer
> supplemental groups.
>
> Art
>
> Art S. Kagel
> Advanced DataTools (www.advancedatatools.com)
> Blog: http://informix-myview.blogspot.com/
>
> Disclaimer: Please keep in mind that my own opinions are my own
> opinions and do not reflect on my employer, Advanced DataTools, the
> IIUG, nor any other organization with which I am associated either
> explicitly, implicitly, or by inference. Neither do those opinions
> reflect those of other individuals affiliated with any entity with
> which I am affiliated nor those of the entities themselves.
>
> On Wed, Nov 7, 2012 at 10:18 AM, JACQUES RENAUT <jrenaut@us.ibm.com>
> wrote:
>
> > Original post:
> >
> > Jacques
> >
> > I got a chance this morning to run tusc for both the uses. If I did
> > it correctly here is the output from running it on the two test users.
> >
> > <stuff removed>
> >
> > John
> >
> > Response:
> >
> > I got on one of our itanium machines and did a man on setgroups()
> > and it says it will return EINVAL if the 1st arg (21 in your case
> > for the failing
> > user) is
> > greater then NGROUPS_MAX as defined in <limits.h>. On the machine I
> > was looking at, NGROUPS_MAX was defined as 20 in
> > /usr/include/limits.h>. So I'm going to guess that the user that is
> > failing is assigned to 21 different groups in your /etc/groups file,
> > which is causing the setgroups() call to fail which makes the server
> > not follow on with the exec for the shell for the system command.
> > Not sure if there is any other way at the OS level to be assigned to
> > different groups other then the /etc/groups file, but I'd start
> > checking there and see if that user is in that many groups, and if
> > so, try and removing them from 1 to get them to 20 (or 2 to get to
> > 19) and then see if it would now start to work.
> >
> > Jacques Renaut
> > IBM Informix Advanced Support
> > APD Team
> >
> >
> >
> >
>
>
>
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> >
> >
>
> --14dae93406d7b8fcc604cdea4e8d
>
>
>
>
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