root can only mount/umount

snocked · 08-06-2003, 09:13 AM

snocked@slackware:~$ umount /dev/cdrom
umount: only root can unmount /dev/cdrom from /mnt/cdrom

How do I grant users the ability to mount/umount?

I already tried changing the group of /dev/cdrom to users so users could mount/umount, but that didn´t work.

Mathieu · 08-06-2003, 09:28 AM

You need to modify the CDROM line in the /etc/fstab file.
On the line in the 4th column, there are options seperated by commas, add user.
It should look something like this:

Code:

/dev/cdrom              /mnt/cdrom              udf,iso9660 noauto,user,ro 0 0

killi · 08-06-2003, 09:28 AM

in /etc/fstab you got your cdrom line something like this

Code:

/dev/cdrom       /mnt/cdrom       iso9660     noauto,ro   0   0

edit to this

Code:

 /dev/cdrom       /mnt/cdrom       iso9660     noauto,user,ro   0   0

killi · 08-06-2003, 09:29 AM

then you be able to mount and umount

snocked · 08-06-2003, 09:49 AM

thank you both

vincebs · 04-22-2004, 03:32 AM

I did this but it still doesn't work. Here is my fstab:

...
/dev/hdc /mnt/cdrom auto user,sync,ro,iocharset=iso8859-1 0 0
...

Anyone know what's missing?

Thanks,
Vince

spacer · 04-22-2004, 05:56 AM

What error are u getting ?
Also check the permissions of the directory /mnt/cdrom

silver2003 · 04-22-2004, 08:14 AM

the mount and umount are commands, you should set new permisions for those commands that are located in /bin/mount and /bin/umount.

To change the permisions you use the following command :

chmod 777 /bin/mount /bin/umount

and now every user of your machine can mount and umount.

And try to change the owner of those comands.

OR try to copy this comands from /bin/mount /bin/umount to /usr/bin.

CYA

vincebs · 04-22-2004, 01:34 PM

I don't understand, why do regular users need write permission to use mount and umount? Right now they're both set at -rwsr-xr-x (4755)

My /mnt/cdrom directory is set at drwxr-xr-x (755)

My error message was:
umount: only root can unmount /dev/hdc from /mnt/cdrom

Muzzy · 04-22-2004, 02:52 PM

If root mounted it in the first place, then only root can unmount it, I believe.