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Bear in mind that there are things in the filesystem that must be writeable -- some stuff in /var, for example as well as /tmp of course. You will need to move these to a ramdisk or other writeable filesystem in order to use a RO root fs.
Cheers
Gary
On 5/24/07, Michael Schmidt <> wrote:
> I know I've seen Technologic documentation about "hardening" a system
> by mounting the filesystem RO, but I can't seem to find it right now.
> Does anyone have a link or general instructions? I assume it involves
> modifying fstab.
>
> Also, once I have the filesystem mounted RO, how do I change the
> system back to mount it RW? That's the part that has me really stumped.
I don't remember the format for fstab, but you can change the FS from RO to
RW and back from the command line something like this:
mount -o remount,rw /dev/hda1 /mnt
mount -o remount,ro /dev/hda1 /mnt
(of course /dev/hda1 and /mnt must be replaced by the filesystem device and
mount point, respectively...)
Regards,
Michael
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