queries on a line in fstab

[Henry Chua]

I found this line in my fstab
"192.168.20.31:/users1/ndb /iwork/network/conversion/rdserver nfs rw,suid 0 0"

what does this line does?

what does suid 0 0 implies?

thank u for ur kind advises!

[Sridhar Bhaskarla · Accepted solution]

Hi Henry,

This an NFS entry. This means, the directory/filesystem /users1/ndb on 192.168.20.31 is to be mounted on /iwork/../rdserver directory on the local system.

nfs indicates that it is an NFS entry.

rw means it's up for read and write. But it doesn't mean anyone can read and write into it. It's according to the permissions and how it is expored on the remote system.

suid means the programs on the NFS mounte directory will run the permissions of their owners. So, if the program is owned by 'userA' and if 'userB' runs it, it will run as 'userA'.

0,0 are typically pass number and backup frequency that are ignored for NFS.

-Sri

[John Poff]

Hi,

This line mounts a filesystem via NFS from the /users1/nds filesystem on server at IP address 192.168.20.31, mounted locally as /iwork/network/conversion/rdserver. The suid option allows setuid execution of files on that mount. The first zero is for backup frequency, and the second zero is for the pass number for when an fsck should be run at boot time.

See 'man mount_nfs' and 'mount fstab' for more information.

JP

[Sridhar Bhaskarla]

Henry,

I just want to make sure I am not conveying wrong information. I didn't mean all programs on NFS mounted directory will be run as 'suid' programs if 'suid' option is specified. It's only applicable to the programs that already have 'suid' permissions. I am a fat fingered 'typo' master ;-)

-Sri

[Gerhard Roets]

Hi,

The suid implies suid is allowed. You cn make nosuid to dissalow users from suid-ing on that filesystem. This might break some applications that rely on suid though.

Regards
Gerhard