problem in exporting a partition on a usb stick as nfs volume

tkmsr · 01-05-2011, 02:07 AM

I have a USB disk which has 2 partitions.

It is the default behavior in the OS (Lucid 10.04 64 bit) that upon connecting a USB (be it thumb drive or hard disk) it will mount it in

Quote:

/media.

I have 2 patitions on the USB hard disk as follows

Quote:

ls -l /media

drwxrwxrwx 2 tkmsr tkmsr 2048 2010-02-12 04:12 HPLAUNCHER
drwx------ 7 tkmsr tkmsr 4096 1970-01-01 05:30 vol1
drwx------ 1 tkmsr tkmsr 20480 2011-01-03 17:43 vol2

I want to share vol2 on nfs

Here is the /etc/exports file entry on nfs server

Quote:

/media/vol2 192.168.1.0/24(rw,sync,no_subtree_check)

On the client machine I tried to mount the above nfs volume

Quote:

mount -t nfs 192.168.1.19:/media/vol2 /mnt/nfs

Things worked well upto here.

But I was not able to go inside the mounted volume at the client machine.

Hence I checked the permissions on the folder on nfs server they were as follows

Quote:

drwx------ 1 tkmsr tkmsr 20480 2011-01-03 17:43 vol2

and the share mounted on client machine which was above only had following permissions

Quote:

drwx------ 1 client_hostname client_hostname 20480 2011-01-03 17:43 vol2

Considering this to be source of problem I tried to change the permissions at the server

Quote:

chmod -R 755 /media/vol2

but this attempt failed.
Does any one has any clue as what might be the issue?
It appears to be some file system problem.

I checked by mount command the type of file system on USB disk

Quote:

/dev/sdb2 on /media/vol1 type vfat (rw,nosuid,nodev,uhelper=udisks,uid=1000,gid=1000,shortname=mixed,dmask=0077,utf8=1,flush)
/dev/sdb5 on /media/vol2 type fuseblk (rw,nosuid,nodev,allow_other,blksize=4096,default_permissions)
/dev/sr1 on /media/HPLAUNCHER type iso9660 (ro,nosuid,nodev,uhelper=udisks,uid=1000,gid=1000,iocharset=utf8,mode=0400,dmode=0500)

and the

Quote:

/var/log/syslog

shows

Quote:

Jan 6 10:24:12 tkmsr ntfs-3g[2278]: Mounted /dev/sdb5 (Read-Write, label "vol2", NTFS 3.1)
Jan 6 10:24:12 tkmsr ntfs-3g[2278]: Cmdline options: rw,nosuid,nodev,uhelper=udisks,uid=1000,gid=1000,dmask=0077
Jan 6 10:24:12 tkmsr ntfs-3g[2278]: Mount options: rw,nosuid,nodev,uhelper=udisks,silent,allow_other,nonempty,relatime,fsname=/dev/sdb5,blkdev,blksize=4096,default_permissions
Jan 6 10:24:12 tkmsr ntfs-3g[2278]: Global ownership and permissions enforced, configuration type 1

Where I see ntfs-3g driver in use for the above volume which I want to export on nfs.Can this be the source of my problems? Or I need to check some thing else?

I notice the output of mount command

Quote:

/dev/sdb5 on /media/vol2 type fuseblk (rw,nosuid,nodev,allow_other,blksize=4096,default_permissions)

Is there a way I can enforce to load changed permissions on the said USB and change this default behavior.
This seems to be the only cause of problem to me.If any one has any other suggestion let me know.

Linux.tar.gz · 01-06-2011, 04:53 AM

Hiho ^^

As far as i know, some filesystems work badly with nfs. Dunno if it's the case here.

Try to manually mount the drive in another folder (ie /mnt/usb), and apply you export to this folder.
I tell you this, because when HAL mounts drives in /media, folder permissions can be weird for some setups. More info here :
http://www.linuxquestions.org/questi...oblems-808364/
http://www.linuxquestions.org/questi...5/#post3971465

If you try to access the share as root, then you must use this export option : no_root_squash

Did you tried a simple nfs share of a "normal" folder in order to ensure basic setup works ?

tkmsr · 01-06-2011, 05:04 AM

Quote:

Originally Posted by Linux.tar.gz

Hiho ^^

no_root_squash

Ahhh shit yea I had forgotten it now it worked perfectly thanks.