Creating a Centos 7 iso with kickstart

Question

I wish to create an iso file containing Centos 7 x64 for unattended/kickstart installations. For Centos 6, it worked like a charm. But for Centos 7, i am not able to create a bootable iso image.

This is what i did:

Mounted the original .iso

mkdir /tmp/iso
mount /work/CentOS-7-x86_64-Minimal-1503-01.iso /tmp/iso -o loop

Copying the files to a new directory:

mkdir /work/kickstart 
rsync -avz /tmp/iso/ /work/kickstart/

Creating a new iso:

genisoimage -untranslated-filenames -volid 'CentOS-7.0-KS-x86_64' -J -joliet-long -rational-rock -translation-table -input-charset utf-8 -x  ./lost+found -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -eltorito-alt-boot -e images/efiboot.img  -no-emul-boot -o /work/centos7.iso -T /work/kickstart
isohybrid -u /work/centos7.iso

All is good so far, but when i try to boot out of this image i get:

dracut-initqueue[577]: Warning: Could not boot.
dracut-initqueue[577]: Warning: /dev/root does not exist

Screen shot - http://prntscr.com/81rs63

What causes this problem? I guess i am not creating the iso right, it should be a simple copy of the same data.

Answer 1

I have not put that up somewhere right now.. but did that last week for a RHEL 7 installation but should be the same for CentOS7. Steps are as following:

1. get the ISO file of CentOS 7

2. mount -o loop CentOS-7.0*.iso /mnt/

3. mkdir -p /CentOS-7-ISO-respin/{CentOS-7-unpacked,CentOS-7-iso}

4. rsync -avz /mnt/ /CentOS-7-ISO-respin/RHEL-7-unpacked

5. put your kickstart file into /CentOS-7-ISO-respin/RHEL-7-unpacked

6. add a new line to /CentOS-7-ISO-respin/RHEL-7-unpacked/isolinux/isolinux.cfg (this way you can use the ISO also from a DVD) label linux_ks menu label ^Install CentOS 7 with Kickstart kernel vmlinuz append initrd=initrd.img inst.stage2=hd:sdb2:/ ks=hd:sdb1:/ks.cfg

7. create the ISO with: /usr/bin/genisoimage -untranslated-filenames -volid 'CentOS-7.0-KS-x86_64' -J -joliet-long -rational-rock -translation-table -input-charset utf-8 -x ./lost+found -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -eltorito-alt-boot -e images/efiboot.img -no-emul-boot -o /CentOS-7-ISO-respin/CentOS-7-KS-iso/CentOS-7.0-KS-x86_64-DVD.iso -T /CentOS-7-ISO-respin/CentOS-7-unpacked/ ; isohybrid -u /CentOS-7-ISO-respin/CentOS-7-KS-iso/CentOS-7.0-KS-x86_64-DVD.iso

8. dd if=/CentOS-7-ISO-respin/CentOS-7-CSB-iso/CentOS-7.0-KS-x86_64-DVD.iso of=/dev/XXX (where XXX is the Device Name of your USB drive without the partition number e.g. /dev/sdb) (Careful, that command destroys all data on the Stick)

https://www.redhat.com/archives/kickstart-list/2014-August/msg00010.html