Red Hat Summit Red Hat SummitSupportConsoleDevelopersStart a trialContact

Chapter 2. Performing the pre-customization tasks

You can customize the Red Hat Enterprise Linux installation media by downloading the Red Hat Enterprise Linux 10 boot images from the Red Hat Customer Portal. Once downloaded, extract their contents and rebuild the boot image with specific modifications to support tailored deployment needs.

2.1. Working with ISO images
Copy link

Customizing the installer requires working with the distribution ISO: extract the image to modify its contents, then build a new boot image that includes those changes. For example, add-ons, product.img, or other Anaconda customizations. This workflow covers:

  • Extracting a Red Hat Enterprise Linux ISO to a working directory.
  • Creating a new boot image that contains the customizations.

2.2. Downloading RHEL boot images
Copy link

Before you begin to customize the installer, download the Red Hat-provided boot images. You can obtain Red Hat Enterprise Linux 10 boot media from the Red Hat Customer Portal after logging in to your account.

Note
  • Your account must have sufficient entitlements to download Red Hat Enterprise Linux 10 images.
  • You must download either the Binary DVD or Boot ISO image.
  • You cannot customize the installer by using the other available downloads, such as the KVM Guest Image or Supplementary DVD.

You can extract the contents of a boot image to a working directory and modify the contents to create a new boot image. You can find the boot images on the Red Hat Customer Portal.

Procedure

  1. Ensure that the directory /mnt/iso exists and nothing is currently mounted there.

  2. Mount the downloaded image. 

    # mount -t iso9660 -o loop path/to/image.iso /mnt/iso

    Where path/to/image.iso is the path to the downloaded boot image.

  3. Create a working directory where you want to place the contents of the ISO image. 

    $ mkdir /tmp/ISO

  4. Copy all contents of the mounted image to your new working directory. Ensure that you use the -p option to preserve file and directory permissions and ownership. 

    # cp -pRf /mnt/iso /tmp/ISO

  5. Unmount the image. 

    # umount /mnt/iso
Red Hat logoGithubredditYoutubeTwitter

Learn

Try, buy, & sell

Communities

About Red Hat Documentation

We help Red Hat users innovate and achieve their goals with our products and services with content they can trust. Explore our recent updates.

Making open source more inclusive

Red Hat is committed to replacing problematic language in our code, documentation, and web properties. For more details, see the Red Hat Blog.

About Red Hat

We deliver hardened solutions that make it easier for enterprises to work across platforms and environments, from the core datacenter to the network edge.

Theme

© 2026 Red HatBack to top