Booting from the USB requires that there is a syslinux directory to boot
off of. In EL6, there is only isolinux, which is what booting from a DVD
uses. You should be able to copy isolinux to syslinux, rename the files
from s/iso/sys/ and then update syslinux.cfg to point to the USB drive
to boot from. Here's an example from my setup:
====
LABEL next
MENU LABEL ^A) Boot the next device as configured in your BIOS
MENU DEFAULT
localboot -1
LABEL usb-new-striker01
MENU LABEL ^1) New Striker Dashboard 01 - RHEL 6 - USB - Deletes
All Existing Data!
TEXT HELP
Installs a new Striker Dashboard 01 using RHEL 6. Will
create a traditional
/boot + MBR install for systems with traditional BIOSes.
Partition will
be 0.5 GiB /boot, 4 GiB <swap>, remainder for /.
ENDTEXT
KERNEL vmlinuz
APPEND initrd=initrd.img repo=hd:sdb1:/
ks=hd:sdb1:ks/usb-new-striker01.ks
LABEL usb-new-striker02
MENU LABEL ^2) New Striker Dashboard 02 - RHEL 6 - USB - Deletes
All Existing Data!
TEXT HELP
Installs a new Striker Dashboard 02 using RHEL 6. Will
create a traditional
/boot + MBR install for systems with traditional BIOSes.
Partition will
be 0.5 GiB /boot, 4 GiB <swap>, remainder for /.
ENDTEXT
KERNEL vmlinuz
APPEND initrd=initrd.img repo=hd:sdb1:/
ks=hd:sdb1:ks/usb-new-striker02.ks
label rescue
MENU LABEL ^B) Rescue installed system
MENU HELP
Boot the RHEL 6.6 DVD in rescue mode.
ENDTEXT
KERNEL vmlinuz
APPEND initrd=initrd.img rescue
label memtest86
MENU LABEL ^C) Memory test
MENU HELP
Test the RAM in the system for defects.
ENDTEXT
KERNELmemtest
APPEND -
====
Delete the ks... from the APPEND line if you don't want to use a custom
KS (the existing data from isolinux.cfg should show this, more or less).
I personally re-rolled the ISO so that this (modified) syslinux.cfg was
in the ISO, so that I didn't have to do it after the fact.
hth
digimer
On 13/08/15 02:21 PM, Wes James wrote:
> I’ve been trying to get the dd of an iso to a usb flash drive to work for CentOS 6.7. It is working with the CentOS 7 DVD1 iso (x64), but if I use the same process with 6.7 bin dvd1 iso or the 6.7 live dvd, the flash drive will not boot. I thought 6.x and forward could be done like this.
>
> -wes
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos
>
--
Digimer
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