You will want to follow the instructions for creating a custom .iso
https://access.redhat.com/solutions/60959
^^^ Requires a Red Hat account, or Red Hat Developer Account.
The keys are to modify both:
- /isolinux/isolinux.cfg - for legacy BIOS boot
- /EFI/BOOT/grub.cfg - for UEFI boot
Make sure not to change the Volume Label, as this can mess up the UEFI boot
Then generate the .iso:
# cd /tmp/rhel7/
# mkisofs -o /tmp/rhel7test.iso -b isolinux/isolinux.bin -J -R -l -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -eltorito-alt-boot -e images/efiboot.img -no-emul-boot -graft-points -V "RHEL-7.7 Server.x86_64" .
^^^ Change the "-V" label accordingly for CentOS 8 to match the CentOS 8 disk label.
And the critical command for USB drive booting:
# isohybrid --uefi /tmp/rhel7test.iso
Gregory Young
-----Original Message-----
From: CentOS <centos-bounces@xxxxxxxxxx> On Behalf Of Jerry Geis
Sent: October 4, 2019 11:30 AM
To: CentOS mailing list <centos@xxxxxxxxxx>
Subject: USB ISO for CentOS 8
I did the dd of the ISO to a 16G USB device.
the second partition is FAT so I can edit it - I want to make a custom menu entry.
I edited the grub.cfg - but that did not work - my menu option does not show.
Then I think I need to change BOOT.cfg and generate the grub.cfg - but I dont know in this case how to generate for the USB device.
What command do I use for that ?
Thanks,
Jerry
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