I suspect that this may be working as designed, and the problem is a misunderstanding of what --manage-gids is supposed to do?
I brought up 2 VMs, server & client. On each, I have a user 'emsnyder' (ldap managed) and 'stack' (not ldap), and a group 'disk.' All the uids and gids match for these users and groups. emsnyder@server> sudo chown emsnyder:disk /srv/somedisk emsnyder@server> sudo chmod 775 /srv/somedisk emsnyder@server> id uid=110259082(emsnyder) gid=65534(nogroup) groups=65534(nogroup) emsnyder@server> sudo /etc/init.d/nfs-kernel-server start emsnyder@client> id uid=110259082(emsnyder) gid=65534(nogroup) groups=65534(nogroup),6(disk) emsnyder@client> sudo mount -t nfs server:/srv/somedisk /mnt emsnyder@client> ls -ld /mnt drwxrwxr-x 4 emsnyder disk 4096 May 27 12:08 /mnt emsnyder@client> date > /mnt/f emsnyder@client> ls -l /mnt total 20 -rw-r--r-- 1 emsnyder nogroup 31 May 27 12:40 f drwx------ 2 root root 16384 May 27 11:13 lost+found emsnyder@client> chown emsnyder:disk /mnt/f chown: changing ownership of â/mnt/fâ: Operation not permitted But if I then emsnyder@server> sudo adduser emsnyder disk emsnyder@server> sudo exportfs -r emsnyder@client> chown emsnyder:disk /mnt/f emsnyder@client> ls -l /mnt total 20 -rw-r--r-- 1 emsnyder disk 31 May 27 12:40 f drwx------ 2 root root 16384 May 27 11:13 lost+found The --manage-gids (confusingly named, IMHO) means that the server side ignores the group membership information from the client, and looks just at what groups the user has on the server side. Since emsnyder started out without the 'disk' group membership on the server, the chown is denied. Once I added emsnyder to the disk group on the server side, the operation succeeds. Also, the --manage-gids option is a configuration for the /usr/sbin/rpc.mountd program, which is part of the nfs-kernel-server package, not nfs-utils. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1454112 Title: Group permissions not respected with "--manage-gids" enabled To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nfs-utils/+bug/1454112/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
