I accidentally overwrote the /boot filesystem on a running Ubuntu host where the root fs and swap are LVs, and the kernel, initramfs, etc. are under /boot with grub modules and config under /boot/grub.
How would one go about recreating all the files needed to successfully boot?
# mkfs.ext2 /dev/sda1 # mount /dev/sda1 /boot # apt-get install --reinstall linux-image-`uname -r` linux-image memtest86+ # mkdir /boot/grub # grub-install /dev/sda
That seems to have recreated most everything, bit is that enough? I don't want to chance a reboot without some assurance it will complete.
For the paranoid, this may also be a way of creating a backup boot partition on a flash drive if, for example, your boot partition isn't mirrored but root is.