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On Wed, Oct 04, 2000 at 09:39:11AM +1300, Craig Whitmore wrote:
> I need to set up a server with a user that is in more than 32 groups at a time
> and as far as I know NGROUPS_MAX in limits.h changes this maximum.
> If I increase (say to 256) this will this break anything or will linux work perfectly
> well?
It's almost time for a FAQ.

For RH 6.1 which uses glibc-2.1.2 you need to take the following steps:

1) modify the kernel headers glibc uses (separately installed on RH6.1)

linux/include/linux/limits.h: change NGROUPS_MAX
linux/include/asm-i386/param.h: change NGROUPS accordingly

2) recompile glibc
3) install/upgrade it.

When you have users in >16 groups working on an NFS client this will
break: the RPC protocol passes only the first 16 groups to the server. I've various
NFS client side patches to eliminate this problem (2.2.x, 2.4.0-test*, see

I've set NGROUPS_MAX to 256, no problems.

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