OT - NFS group ignored

[Emmett Culley]

I just noticed that when accessing an NFS mount, the group is ignored.

For example, on the server that shares the files via NFS that lists from the NFS client
as:

$ ls -l/nfs/web
-rw-rw-r-- 1 root   web_prog   491 Oct 16  2012 parse.php

$ mount
web:/ on /lvh1/web type nfs4
(rw,noatime,vers=4.0,rsize=524288,wsize=524288,namlen=255,soft,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=192.168.6.12,local_lock=none,addr=192.168.6.232)


A user on the client machine that is a member of group web_prog cannot write the file
(parse.php).  If the user is changed from root to the client user's UID via chown on
the server, the user on the client machine can then write the file.

The server is on CentOS 7 and the client is on Fedora 21.  If I do the same test from a
CentOS 7 or CentOS 6 machine client, it works as expected.  That is, the group permissions
are honoured by the NFS client on those non-Fedora machines.

So, I figure there is something wrong with my Fedora NFS configuration.  Nothing shows up
that is related to this issue when searching the Internet.

What I have tried:

Insure that Domain in /etc/idmapd.conf  is the same on  both client and server.  Though
the fact that the user ID is honoured would indicate that is correct.

Insured that the numerical user ID and group ID match on both client and server, even
though until now I always assumed that idmapd did not require the numerical IDs to match
with NFS4

Any help would be appreciated.

Emmett