ubuntu-firecracker

Docker container to build a linux kernel and ext4 rootfs compatible with firecracker.

Usage

Build the container:

# linux kernel 4.18.0 release ubuntu:bionic
docker build -t ubuntu-firecracker . 

Build the image:

docker run --privileged -it --rm -v $(pwd)/output:/output ubuntu-firecracker

Start the image with firectl

# copy image and kernel
cp output/vmlinux ubuntu-vmlinux
cp output/image.ext4 ubuntu-rootfs.ext4
# resize image
truncate -s 5G ubuntu-rootfs.ext4
e2fsck -f ubuntu-rootfs.ext4
resize2fs ubuntu-rootfs.ext4
#launch firecracker
firectl --kernel=ubuntu-vmlinux --root-drive=ubuntu-rootfs.ext4 --kernel-opts="init=/bin/systemd noapic reboot=k panic=1 pci=off nomodules console=ttyS0"

Contributions

This project is actively looking for contributions/maintainers. I (bkleiner) have stopped using firecracker a while ago.