15.3. Image creation

A new CLI experience for RHEL image builder is available (Technology Preview)

With this Technology Preview feature, you can install and use the new image-builder-cli package to build an image with just one command.

WSL2 image generation support in RHEL image builder

You can use RHEL image builder to create images for Windows Subsystem for Linux version 2 (WSL2). Image builder generates the images in the wsl format. You can deploy the images by double-clicking the image file to install it in your WSL2 environment.

A new plugin available for RHEL image builder

RHEL image builder cockpit-composer package has been deprecated and replaced with the new cockpit-image-builder package.

RHEL image builder supports creating disk images with advanced partitioning

You can customize partitioning in your blueprints, including custom mount options, LVM-based partitions and LVM-based SWAP, and create disk images with advanced partitioning layout.

You can inject your Kickstart files when creating ISO images

You can use the [customization.installer] blueprint customization field to inject your own Kickstart file when building ISO image. The customization enables you to choose an attended, partial, or fully unattended installation.

The openstack image type is dropped from on premise in RHEL 10

RHEL image builder no longer supports the Openstack image type. You can use the qcow2 image type to build Openstack images.

RHEL 10 Public disk images now have predictable network interface names

The net.ifnames=0 kernel parameter was removed from kernel arguments, causing all systems to use predictable network interface names.

RHEL 10 disk images no longer have the /boot partition from prebuilt disk images

Disk images, such as AWS or KVM, do not have a separate /boot partition, which provides the following enhancements:

The squashfs package has been deprecated

The squashfs package has been deprecated and will be removed in a future major RHEL release. As an alternative, the dracut package now has support for mounting erofs.

Updates on RHEL image builder support to build the RHEL for Edge image types

RHEL image builder will continue to support building Edge images for RHEL 9, but not for RHEL 10. You can use RHEL image mode to build RHEL for Edge images. See Using image mode for RHEL to build, deploy, and manage operating systems.

gdisk has been deprecated from boot.iso

The gdisk program has been deprecated from the boot.iso image type. You can still use gdisk in your Kickstarts. However, for the boot.iso image type, other tools are available for handling GPT disks, for example, the parted utility.