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Joined: 25 Mar 2007
Posts: 30

PostPosted: Sun Oct 06, 2013 9:14 am    Post subject: NFS uid & gid mapping Reply with quote

Hi people !

I have trouble configuring NFS server. I have two computers :
Silver, a fanless server/multimedia box which run under gentoo (custom monolithic kernel)
Linux silver 3.10.7-gentoo #3 SMP Sat Oct 5 11:29:03 CEST 2013 x86_64 AMD E-450 APU with Radeon(tm) HD Graphics AuthenticAMD GNU/Linux

Thor, my old laptop running gentoo as well (custom monolithic kernel too)
Linux thor 3.5.7-gentoo #3 SMP PREEMPT Fri Apr 5 19:27:30 CEST 2013 x86_64 Intel(R) Core(TM)2 CPU T5600 @ 1.83GHz GenuineIntel GNU/Linux

My server holds every medias i have. I made a smb share in a minute to let my flatmates access it from their computer but i would like to use proper NFS with my laptop.

So I installed nfs-utils and built nfs server & client support (version 3 and 4) into both of my kernels.
I exported the share on my server with the all_squash option:
/mnt/data/test thor(rw,insecure,no_subtree_check,sync,anongid=1001,anonuid=1001,all_squash)

silver test # less /etc/passwd | grep thomas

silver test # less /etc/group | grep thomas

Well it did not work as I excepted: no write access even after a
chown -R thomas.thomas on server side.

I figured out that is because of nfsV4 which does not handle squashing correctly (so why no error is reported throug dmesg ???) even with forcing v3 mount with nfsvers option i still had trouble. I removed nfsv4 from my server's kernel and i was able to access to the share properly.

thomas@thor(10:44:29) /mnt/work $ mount -l
silver:/mnt/data/test on /mnt/work type nfs (rw,addr=

thomas@thor(10:43:52) /mnt/work $ ls -l
total 8
drwxr-xr-x 2 root   root       4096 Oct  6 10:39 root_dir
-rw-r--r-- 1 root   root          0 Oct  6 10:39 root_file
drwxr-xr-x 2 invite messagebus 4096 Oct  6 10:38 thomas_dir
-rw-r--r-- 1 invite messagebus    0 Oct  6  2013 thomas_file
thomas@thor(10:44:05) /mnt/work $ groups
root sys wheel audio cdrom video games cdrw usb thomas plugdev amis kvm
thomas@thor(10:44:09) /mnt/work $ touch thomas_dir/remote_thomas_file

thomas@silver /mnt/data/test $ ls -l thomas_dir/
total 0
-rw-r--r-- 1 thomas thomas 0  6 oct.  10:45 remote_thomas_file

as you can see, reading files and writing is not a problem anymore and work as excepted but uid&gid mapping is bad.

on client side i have
thor(10:56:45) /home/thomas # less /etc/group | grep 1001
thor(11:01:03) /home/thomas # less /etc/passwd | grep 1001
messagebus:x:101:1001:added by portage for dbus:/dev/null:/sbin/nologin

I have tried static_map but nfs complains about it
silver ~ # /etc/init.d/nfs restart
 * Caching service dependencies ...                                                                                                                                            [ ok ]
 * Stopping NFS mountd ...                                                                                                                                                     [ ok ]
 * Stopping NFS daemon ...                                                                                                                                                     [ ok ]
 * Unexporting NFS directories ...                                                                                                                                             [ ok ]
 * Exporting NFS directories ...
exportfs: /etc/exports:2: unknown keyword "map_static=/etc/"

What did i missed ? Any ideas ?
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