[Ilugc] One Day One Command
rsubr at pcomm.hfi.unimelb.edu.au
Tue Feb 15 20:27:59 IST 2005
Bharathi Subramanian wrote:
> One Day One Command :-
> mount -- Mount/Attach a File System to a File Tree.
> # mount -t tmpfs none /mnt/test1 -o rw,size=1m -- Mount a tmpFS
> # mount -t tmpfs none /mnt/test1 -o remount,ro,size=1m -- Remount the
> same partition with different permission.
I find the last one most useful during rescue operations in single user mode.
Here is how a typical root password recovery would go -
In lilo/grub pass the "init=/bin/sh" option to the kernel and you will
be dropped into a root shell with only / mounted. The kernel usually mounts
/ as read-only so that fsck can be run. And here is the rest -
# mount -o remount,rw /
# mount /proc # you may need this
# passwd root
# umount /proc
# mount -o remount,ro /
# exec /sbin/init
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