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Red Hat provides boot media as ISO images, which you can use to boot your systems from. We will create a custom ISO image, which will allow us to boot a system in a similar way.
Let's create an ISO that you can mount as virtual media, write a CD-ROM, or even use
to write the contents on a USB stick/disk through the following steps:
yum install -y genisoimage
mount -o loop /path/to/rhel-server-7.0-x86_64-dvd.iso /mnt
mkdir -p /root/iso cp -r /mnt/isolinux /root/iso umount /mnt
isolinux.cfgfile using the following command:
rm -f /root/iso/isolinux/isolinux.cfg
isolinux.cfgfile, as follows:
default vesamenu.c32 timeout 600 display boot.msg menu clear menu background splash.png menu title Red Hat Enterprise Linux 7.0 menu vshift 8 menu rows 18 menu margin 8 menu helpmsgrow 15 menu tabmsgrow 13 menu color sel 0 #ffffffff #00000000 none menu color title 0 #ffcc000000 #00000000 none menu color tabmsg 0 #84cc0000 #00000000 none menu color hotsel 0 #84cc0000 #00000000 none menu color hotkey 0 #ffffffff #00000000 none menu color cmdmark 0 #84b8ffff #00000000 none menu color cmdline 0 #ffffffff #00000000 none label linux menu label ^Install Red Hat Enterprise Linux 7.0 kernel vmlinuz append initrd=initrd.img ks=http://kickstart.critter.be/kickstart.ks text label local menu label Boot from ^local drive localboot 0xffff menu end
cd /root/iso # mkisofs -o ../boot.iso -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -J -r .
More information on the options used with the
mkisofs command can be found in the
man pages for mkisofs(1).
dmesgcommand. A log detailing all recent events will be displayed. At the bottom of this log, you will see a set of messages caused by the USB flash drive you just connected. It will look like a set of lines similar to the following:
[ 170.171135] sd 5:0:0:0: [sdb] Attached SCSI removable diskNote the name of the connected device - in the above example, it is
$ su -Provide your root password when prompted.
findmnt devicecommand and the device name you found in the earlier steps. For example, if the device name is
sdb, use the following command:
# findmnt /dev/sdbIf the command displays no output, you can proceed with the next step. However, if the command does provide output, it means that the device was automatically mounted and you must unmount it before proceeding. A sample output will look similar to the following:
# findmnt /dev/sdb TARGET SOURCE FSTYPE OPTIONS /mnt/iso /dev/sdb iso9660 ro,relatimeNote the
TARGETcolumn. Next, use the
umount targetcommand to unmount the device:
# umount /mnt/iso
ddcommand to write the installation ISO image directly to the USB device:
# dd if=/path/to/image.iso of=/dev/device bs=blocksizeReplace /path/to/image.iso with the full path to the ISO image file you downloaded, device with the device name as reported by the
dmesgcommand earlier, and blocksize with a reasonable block size (for example,
512k) to speed up the writing process. The
bsparameter is optional, but it can speed up the process considerably.
ImportantMake sure to specify the output as the device name (for example,
/dev/sda), not as a name of a partition on the device (for example,
For example, if the ISO image is located in
and the detected device name is
sdb, the command will look like the following:
# dd if=/home/testuser/Downloads/rhel-server-7.1x86_64-boot.iso of=/dev/sdb bs=512k
ddto finish writing the image to the device. Note that no progress bar is displayed; the data transfer is finished when the
#prompt appears again. After the prompt is displayed, log out from the
rootaccount and unplug the USB drive.
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Last modified: February, 17, 2021