4.8. Creating raw disk images by using bootc-image-builder


You can convert a bootc image to a raw image with an MBR or GPT partition table by using bootc-image-builder.

The RHEL base image does not include a default user, so optionally, you can inject a user configuration by using the --config option to run the bootc-image-builder container. Alternatively, you can configure the base image with cloud-init to inject users and SSH keys on first boot. See Users and groups configuration - Injecting users and SSH keys by using cloud-init.

Prerequisites

  • You have Podman installed on your host machine.
  • You have root access to run the bootc-image-builder tool, and run the containers in --privileged mode, to build the images.
  • You have pulled your target container image in the container storage.

Procedure

  1. Optional: Create a config.toml to configure user access, for example:

    [[customizations.user]]
    name = "user"
    password = "pass"
    key = "ssh-rsa AAA ... user@email.com"
    groups = ["wheel"]
  2. Run bootc-image-builder. If you want to use user access configuration, pass the config.toml as an argument. The image must be accessible from a registry, such as registry.redhat.io/rhel10/bootc-image-builder:latest.

    $ sudo podman run \
        --rm \
        --privileged \
        --pull=newer \
        --security-opt label=type:unconfined_t \
        -v /var/lib/containers/storage:/var/lib/containers/storage \
        -v ./config.toml:/config.toml \
        -v ./output:/output \
        registry.redhat.io/rhel10/bootc-image-builder:latest \
        --type raw \
        --config /config.toml \
      quay.io/<namespace>/<image>:<tag>

    You can find the .raw image in the output folder.

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