Tested with Debian 10 Buster.

This project is based on the Official LFS 10.0 Book

http://lfs.mirror.fileplanet.com/lfs/view/10.0/

Add the following packages

sudo apt install build-essential bison gawk git htop texinfo

Set these Enviornment Variables

export LFS=/mnt/lfs
export ALFS=/mnt/lfs/alfs

Create a new ext4 parition /dev/sdb1 (option n) and make it bootable (option a)

sudo fdisk /dev/sdb

Mount new ext4 partition

sudo mkdir $LFS
sudo mount -t ext4 /dev/sdb1 $LFS

Grab the alfs project files

sudo git clone https://github.com/mattwind/alfs.git $ALFS
cd $ALFS

Verify required programs

sudo $ALFS/version_check.sh

Download toolchain source code from wget-list

sudo -E $ALFS/get_packages.sh

Setup the LFS user environment

sudo -E $ALFS/useradd_lfs.sh

These scripts are required to run as the new lfs user

sudo su lfs 
$ALFS/scripts/build_toolchain.sh
$ALFS/scripts/build_temp-toolchain.sh
exit

Run as root with environment variables set earlier

sudo -E $ALFS/scripts/build_lfs.sh

Below the warning is how I installed grub while inside the chrooted LFS system

Consider reading the LFS book for backing up your bootloader.

http://lfs.mirror.fileplanet.com/lfs/view/stable/chapter10/grub.html

grub-install --root-directory=/ /dev/sdb
grub-mkconfig -o /boot/grub/grub.cfg

Updating grub defaults

vi /etc/default/grub

Get friendly eth0 network names and qemu console on boot.

GRUB_TERMINAL=console
GRUB_CMDLINE_LINUX_DEFAULT="net.ifnames=0 biosdevname=0"

Remember to run grub-mkconfig to apply new grub default settings.

grub-mkconfig

Confirm that LFS and ALFS environment variables are both set and LFS partition is mounted.

Re-enter chroot and pass partition

sudo -E $ALFS/extras/chroot.sh /dev/sdb1

Emulate the LFS system with qemu (pass drive)

sudo -E $ALFS/extras/qemu.sh /dev/sdb

The root password in the LFS chrooted system is root.

The lfs user on the host system can be deleted with sudo deluser lfs the lfs user /home/lfs folder can also be removed. It is only required to build the first toolchain.

This can happen if you are trying to boot from qemu and the entry for root=/dev/??? is not sda

Simply edit vi /boot/grub/grub.cfg and change root references to sda1

root=/dev/sda1

When I am booting from my physical server I had to set it back to sdb1, because sda is my primary Debian installation.

root=/dev/sdb1

Linux From Scratch 10 Book

http://lfs.mirror.fileplanet.com/lfs/view/10.0/

Beyond Linux From Scrach 10 Book

http://lfs.mirror.fileplanet.com/blfs/view/10.0/

Added compressed single page versions to the books directory