Cross Linux From Scratch (CLFS) on the Docker

Cross Linux From Scratch (CLFS) is a project that provides you with step-by-step instructions for building your own customized Linux system entirely from source.

The default password is clfs. This can be changed by editing CONFIG_ROOT_PASSWD of config.mk.

Preparing Build Environment

Ubuntu 20.04 is recommended.

sudo apt update
sudo apt install gcc g++ make wget

Step 1) Download All The Packages

make download

Step 2) Build Toolchain

make toolchain

$ out/tools/bin/x86_64-clfs-linux-musl-gcc --version
x86_64-clfs-linux-musl-gcc (CLFS x86_64 2021.09) 11.2.0
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Step 3) Build Root File System

make system

Step 4) Generate Root File System File

make image

How to use it in Docker

sudo su
cat out/images/CLFS-1.0.0.tar.gz | docker import - clfs:1.0.0
docker run --name clfs -d -i -t --restart always clfs:1.0.0 /bin/sh
docker attach clfs

Publish a Docker Image to GitHub

1. Go to 'GitHub Profile > Settings > Developer settings > Personal access tokens > Generate new token'.
   https://github.com/settings/tokens/new
2. Check the checkboxes of repo, write:packages, read:packages, and delete:packages.
3. Use the terminal with root privileges.
4. Execute the docker login ghcr.io -u <GitHub_Username> in Terminal.
5. When prompted for a password, enter the token generated in step 2.
6. Execute the docker images -a in Terminal.
   The image you just added is displayed. Note the 'IMAGE_ID'.
7. docker tag <IMAGE_ID> ghcr.io/<GitHub_Username>/<IMAGE_NAME>:<TAG>
   Execute the above command. <IMAGE_ID> is the 'IMAGE_ID' you just wrote down.
8. Execute the command below to push to GitHub.
   docker push ghcr.io/<GitHub_Username>/<IMAGE_NAME>:<TAG>
9. If you go to 'Profile' on GitHub, you can see 'Packages' added.
   Click the 'Packages' so that check published docker image.

Useful Docker Commands

Delete all containers and images :

sudo su
docker stop $(docker ps -a -q)
docker rm $(docker ps -a -q)
docker rmi -f $(docker images -q)

Thanks to

• Buildroot
• Cross Linux From Scratch (CLFS)
• PiLFS