How to build minimum Linux distribution ?

Not verified yet

1. download Linux kernel and busybox source code.
2. extract source code at linux and busybox
3. install ncurses and bc
4. cd to linux folder and make menuconfig to have a gui to customize kernel configuration; then make tar-pkg to build kernel and package in a tarball.
5. cd to busybox folder and make menuconfig; check build busybox as a static binary; then make; copy out the executable binary file of busybox.
6. dd if=/dev/zero of=disk.img count=1 bs=512M to create 512MB disk; format the disk with mkfs.ext4; use losetup to bind the disk.img to a loop device such as /dev/loop0
7. mkdir a new folder and mount as /dev/loop0; extract built linux kernal to the folder; in the folder also do mkdir dev proc sys bin sbin sys var etc dev
8. copy busybox binary to bin folder; in sbin folder, do ln to create a soft link of init (→ busybox); in bin folder, create soft link of sh, bash (→ busybox)
9. run grub2-install --root-directory=<mount_folder> --no-floppy --force /dev/loop0 to set up bootable section
10. convert disk.img to disk.vmdk (for example with qemu-img)
11. creaet a virtual machine to run the min linux
12. in grub boot screen: input linux /boot/vmlinuz-<kernel_version> root=/dev/sda rw; then type boot to get min linux run
13. use busybox ifconfig to config network