Building a Custom Boot ISO for Red Hat Virtualization Hypervisor

This repo provides a script to automate the customization and build process of a custom RHV-H ISO. The work is based on the Blog Article - Building a Custom Boot ISO for Red Hat Virtualization Hypervisor by Marc Skinner

Using the script

The script has a builtin usage function, which shows the basic usage of that script. Note the script should be executed with super-user privileges.

$ ./build-iso.sh -h
This script must be run with super-user privileges.
Usage: build-iso.sh [-bh] [-p rhv.iso]
  -b         build RHV-H custom ISO
  -h         display help
  -p rhv.iso prepare the environment to customize ISO
             before building

Prerequisites

Install all required packages

Please make sure, you have pre-installed the following packages on your build-system.

• syslinux - Simple kernel loader which boots from a FAT filesystem
• isomd5sum - Utilities for working with md5sum implanted in ISO images
• genisoimage - Creates an image of an ISO9660 file-system

Download the RHV-H image from Red Hat

The images can be downloaded from access.redhat.com

Setup variables

• configure the build-iso.rc file to setup necessary variables

# Path to working directory
ISO_BASEDIR="/tmp/RHVH-custom"
# filename of created RHV-H custom image
ISO_OUT="RHVH-4.4-custom.x86_64.iso"

Start the preparation process

This process will Copy the content from RHV image into a working directory, which will be used for modifications and build.

$ sudo ./build-iso.sh -p ~/Downloads/RHVH-4.4-20201117.0-RHVH-x86_64-dvd1.iso

Perform your customization

All file in modification directory will be included into the image.

To customize the ks.cfg it needs to be copied to modifications-directory.

$ cp ks.cfg /tmp/RHVH-custom/modifications

Run the build process

To start the build process, execute the following command.

# sudo ./build-iso.sh BUILD

This will create the ISO in the directory ISO_BASEDIR you've configured in build-iso.rc

Disclaimer

There is no warranty on success by using these scripts. You will use these scripts on your own risk.