Change livecd-iso with chroot

Ask Fedora
1

Hi all,

My first post here :slight_smile:
I’ll hope i’m in the rigth spot/category …

I’m trying to change a livecd-iso but it won’t boot. It stops with messages about dracut. Later the complete messages.

I followed this video on youtube “watch?v=_LobCfU_uIY” (could use only 2 links as a new user ) … but with the latest Fedora livecd : Fedora-Workstation-Live-x86_64-34-1.2.iso

These are the steps I made allready.

sudo -i
cd /root
mkdir mnt
mkdir iso
mount -o loop Fedora-Workstation-Live-x86_64-34-1.2.iso ./mnt

cp -rfp ./mnt/* iso/.
cd iso/LiveOS
unsquashfs squashfs.img					
cd squashfs-root/LiveOS/
mkdir rootfs

 
mount -o loop rootfs.img rootfs
chroot rootfs

# In "host" OS : 
sudo cp /etc/resolv.conf /root/tmp/iso/LiveOS/squashfs-root/LiveOS/rootfs/etc/resolv.conf
ping google.com


dnf remove libreoffice-core      (otherwise there isn't enough room)
dnf update -y

# All went well .....

exit         # out of chroot 

umount rootfs
rm -rf rootfs
cd ../..

rm squashfs.img
mksquashfs squashfs-root/ squashfs.img -noappend -always-use-fragments

rm -rf squashfs-root/
cd ..


#    Now create new iso : 



mkisofs -o /media/custom_iso.iso \
	-b isolinux/isolinux.bin \
	-c isolinux/boot.cat \
	--no-emul-boot \
	--boot-load-size 4 \
	--boot-info-table \
	-R -J -v -T -V "Fedora-Workstation-Live-x86_64-34-1.2" .

This results in : genisoimage: Volume ID string too long

Because of this i came at : Custom Bootable ISO from RHEL 7.1 - Red Hat Customer Portal

Which say’s that the name is too long and has to be like " inst.stage2= parameter in isolinux.cfg"
This inst.stage2 isn’t in isolinux.cfg but there are names like : " Fedora-WS-Live-34-1-2" which i used.
And that works (only because its not longer than 32 characters i think ).

Run qemu :
qemu-system-x86_64 -boot d -cdrom /media/custom_iso.iso -m 512

This takes time ( 7 year old laptop ).

Result is dracut problems …

24c3df3a68f5b0df0f3b57b87daf3c89ecdb0f36.png
24c3df3a68f5b0df0f3b57b87daf3c89ecdb0f36.png726×462 15.2 KB

I even tried without dnf update but makes no difference.

Please anybody … point me to the rigth direction … :slight_smile: .

1 Like
2

I am not sure what you are actually trying to do.

Are you trying to install fedora?
Are you trying to make a different bootable iso?
Are you thinking that copying the content of the install media will give you a bootable system?

First, that iso you have is already a bootable image, and if you use dd or rufus to put it on a usb stick you will have a bootable usb. It then can be used to either run as a live image or do an install.

Secondly, there is a tool called ventoy that can be put onto a usb then the iso you have can be directly copied onto that usb and will be bootable using ventoy.

Tell us in a little more detail the goal instead of just the already failed steps so we know how to proceed.

3

About dracut, did you see that?
https://docs.fedoraproject.org/en-US/quick-docs/debug-dracut-problems/

Please put your terminal commands in pre-formatted text </> (see top bar). Your topic gets shorter and the formatted text is scroll-able.

About making a own boot-able Live-cd, there is a whole topic about it. There it explains also how you have to rebrand it , if you want to use it for your clients for example.

1 Like
4

Ah that one i did not see yet … i’ll look into that.

You mean this one : https://discussion.fedoraproject.org/t/how-do-i-create-a-custom-fedora-iso/74816/2 ?

1 Like