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How to create a bootable system with a squashfs root

rated 0 times [ 8] [ 0] / answers: 1 / hits: 48585 / 2 Years ago, thu, august 4, 2022, 2:06:47

My goal is to be able to take a customized root file system loaded with the software I want. So far I've created a squashed filesystem using debootstrap and chroot to install the software I want on the system.

The problem I am now running in to.. whenever I boot in to the system, my user accounts that were set up in the chroot do not work. First boot everything works out, second boot I can't log in. That is baffling to me.

Any one know a reason or a place to start looking?

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4 Years ago

answered 2 Years ago whipstder · Accepted Answer

To get a working system with a squashfs filesystem:

sudo apt-get install live-boot live-boot-initramfs-tools extlinux

sudo update-initramfs -u

Create a squashfs file from a bootstrapped or running ubuntu filesystem with whatever packages you want available. https://help.ubuntu.com/community/LiveCDCustomizationFromScratch provides good instructions for creating a debootstrapped system to build on. Format the target drive with ext2/3/4 and enable the bootable flag. Create the folder layout on the target drive and install extlinux:

mkdir -p ${TARGET}/boot/extlinux ${TARGET}/live

extlinux -i ${TARGET}/boot/extlinux

dd if=/usr/lib/syslinux/mbr.bin of=/dev/sdX #X is the drive letter

cp /boot/vmlinuz-$(uname -r) ${TARGET}/boot/vmlinuz

cp /boot/initrd.img-$(uname -r) ${TARGET}/boot/initrd

cp filesystem.squashfs ${TARGET}/live

Create ${TARGET}/boot/extlinux/extlinux.conf with the following contents:

DEFAULT Live

LABEL Live

  KERNEL /boot/vmlinuz

  APPEND initrd=/boot/initrd boot=live toram=filesystem.squashfs

TIMEOUT 10

PROMPT 0

Now you should be able to boot from the target drive in to your squashed system.