Messages in this thread | | | Date | Fri, 6 Oct 2000 00:16:52 +0200 | From | Frank van Maarseveen <> | Subject | Re: NGROUPS_MAX |
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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 also http://www.inter.nl.net/users/fvm/nfs-ngroups)
I've set NGROUPS_MAX to 256, no problems.
-- Frank - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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