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user12096
Asked: 2009-07-22 08:56:53 +0800 CST

How to mount external vfat drive as user?

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I have a mountpoint /mnt/v1 and a user bak in group bak. I did this:

sudo chown bak:bak /mnt/v1
sudo chmod 775 /mnt/v1

Now I want to mount an external fat32 drive with partition /dev/sdb1 to this directory. I get the message "only root can do that", so I found out I need to change fstab and added this line:

/dev/sdb1       /mnt/v1     vfat        noauto,user           0      2

But still I get the nasty message "only root can do this" when I mount like this:

bak$ mount -t vfat /dev/sdb1 /mnt/v1

But when I mount as root the whole drive get permissions of root which I don't want.

Is there some action necessary so the new fstab entry get's read into the kernel? How can I achieve what I want?

linux mount security permissions storage

1 Answers

  1. Best Answer

    When you mount your vfat partion you can pass a uid and gid option to set the userid and groupid the filesystem will be owned by. You can also set a file and directory permission mask. If the filesystem will be used by several people consider creating a group and adding yourself as a member.

    Your fstab should look something like this.

    /dev/sdb1 /mnt/v1 vfat noauto,user,uid=blah,gid=blah 0 2

    and your mount command would look like this.

    mount -t vfat /dev/sdb1 /mnt/v1 -o uid=blah,gid=blah

    You may also want to look at installing the pmount package to make mounting filesystem as a user easy.

    Answer to questions in the comments.

    1) is the fstab necessary also when I use the mount command?

    If you want a user to be able to mount the command without using sudo, then yes.

    2) do I have to be root for the mount command you gave me?

    You could remove the noauto from the fstab, and the filesystem will be mounted at boot time. Or as a regular user they can mount with a command like mount /mnt/v1.

    3) How do the changes in fstab become active?

    Since you have used noauto, nothing will happen automatically. The entry just allows a user to be able to mount the fileystem.

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