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
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@centos.org http://lists.centos.org/mailman/listinfo/centos
On 08/13/2015 11:34 AM, Digimer wrote:
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:
Perhaps something went wrong with the 6.7 DVD, I haven't tested yet. It is definitely supposed to work by just using dd to a USB stick. Both 6.5 and 6.6 DVDs works just fine and so does the 6.7-network- install iso. I just installed a node 10 minutes ago using that one booted from a USB stick.
Thomas
On 08/13/2015 02:30 PM, Thomas Eriksson wrote:
On 08/13/2015 11:34 AM, Digimer wrote:
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:
Perhaps something went wrong with the 6.7 DVD, I haven't tested yet. It is definitely supposed to work by just using dd to a USB stick. Both 6.5 and 6.6 DVDs works just fine and so does the 6.7-network- install iso. I just installed a node 10 minutes ago using that one booted from a USB stick.
I just dd'ed the 6.7 DVD1 image to a usb key and booted fine with it on a machine with normal BIOS.
I'll test it on a UEFI machine later, but it seems to work fine.
One thing to make sure is that the key is unmounted before you start // I used this command:
sudo dd if=./CentOS-6.7-x86_64-bin-DVD1.iso of=/dev/sdc bs=4M
(Also make sure to copy to the device and not a partition .. ie, not /dev/sdc1 .. /dev/sdc)
And make sure to use the command:
sync
after the dd .. and umount/eject the device if it remoted before removing the key from the machine where you are copying it.
On 13/08/15 09:15 PM, Johnny Hughes wrote:
On 08/13/2015 02:30 PM, Thomas Eriksson wrote:
On 08/13/2015 11:34 AM, Digimer wrote:
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:
Perhaps something went wrong with the 6.7 DVD, I haven't tested yet. It is definitely supposed to work by just using dd to a USB stick. Both 6.5 and 6.6 DVDs works just fine and so does the 6.7-network- install iso. I just installed a node 10 minutes ago using that one booted from a USB stick.
I just dd'ed the 6.7 DVD1 image to a usb key and booted fine with it on a machine with normal BIOS.
I'll test it on a UEFI machine later, but it seems to work fine.
One thing to make sure is that the key is unmounted before you start // I used this command:
sudo dd if=./CentOS-6.7-x86_64-bin-DVD1.iso of=/dev/sdc bs=4M
(Also make sure to copy to the device and not a partition .. ie, not /dev/sdc1 .. /dev/sdc)
And make sure to use the command:
sync
after the dd .. and umount/eject the device if it remoted before removing the key from the machine where you are copying it.
My apologies for the mis-information.
Did this change in a recent release? (The addition of syslinux to the ISO, that is)
On 08/13/2015 11:06 PM, Digimer wrote:
On 13/08/15 09:15 PM, Johnny Hughes wrote:
On 08/13/2015 02:30 PM, Thomas Eriksson wrote:
On 08/13/2015 11:34 AM, Digimer wrote:
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:
Perhaps something went wrong with the 6.7 DVD, I haven't tested yet. It is definitely supposed to work by just using dd to a USB stick. Both 6.5 and 6.6 DVDs works just fine and so does the 6.7-network- install iso. I just installed a node 10 minutes ago using that one booted from a USB stick.
I just dd'ed the 6.7 DVD1 image to a usb key and booted fine with it on a machine with normal BIOS.
I'll test it on a UEFI machine later, but it seems to work fine.
One thing to make sure is that the key is unmounted before you start // I used this command:
sudo dd if=./CentOS-6.7-x86_64-bin-DVD1.iso of=/dev/sdc bs=4M
(Also make sure to copy to the device and not a partition .. ie, not /dev/sdc1 .. /dev/sdc)
And make sure to use the command:
sync
after the dd .. and umount/eject the device if it remoted before removing the key from the machine where you are copying it.
My apologies for the mis-information.
Did this change in a recent release? (The addition of syslinux to the ISO, that is)
I did not see a syslinux only isolinux .. it still boots and installs on my Dell M4500 laptop as is.
-
Digimer -
Johnny Hughes -
Thomas Eriksson -
Wes James