how to unlimit the number of group for one user in centos4/5

Question

If one user have more than 16 groups, it will cause that the groups don't work for permission control. How to unlimited this number of groups per user in Centos4/5 ? Answer You can't unlimit the additionnal groups per user. But you can raise the limit. Beware that most Unix systems are limited to 16 groups per user (see http://www.j3e.de/ngroups.html)

Accepted Answer

You can&#8217;t unlimit the additionnal groups per user. But you can raise the limit. Beware that most Unix systems are limited to 16 groups per user (see http://www.j3e.de/ngroups.html) , so does NFS, see  https://xkyle.com/solving-the-nfs-16-group-limit-problem/ and/or http://nfsworld.blogspot.fr/2005/03/whats-deal-on-16-group-id-limitation.htmlThe number of group per user is defined by NGROUPS_MAX from <limits.h> but should be read with sysconf(_SC_NGROUPS_MAX). You can change the kernel maximum group count with sysctl kernel.ngroupmax or /proc/sys/kernel/ngroups_max. But this will require support from C library, PAM and login program.

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