Enterprise Linux Image Builds

This directory contains Daisy workflows and kickstart configs to build the Enterprise Linux (RHEL, CentOS, etc.) Public Images for GCE.

Details

Enterprise Linux workflows require an installation media to be provided in ISO format and stored in GCS. The build method is described below, and the output is a GCE Image in the build project.

Build method

The specific image build workflows all include the base enterprise_linux.wf.json workflow. This workflow takes the following steps:

1. Create an instance using the debian-10-worker image for the boot disk, an empty second disk attached, and the startup script set in metadata to use the linux\_common bootstrap script and the build\_installer.py script on boot.

2. On boot, the build\_installer.py script will partition and format the empty disk, then extract the installer ISO media and the appropriate kickstart config onto it. This makes the installer into a bootable disk.

3. Create an instance using the just prepared disk as a boot disk and an empty second disk.

4. On boot, the installer will automatically install the operating system onto the second disk.

5. Produce an image from the second disk.

RHEL images

RHEL images will contain by default access to an appropriate set of RHEL content; use of this content is provided as part of your GCE customer agreement and is billed based on instance usage.

Red Hat BYOS images will contain the subscription-manager tool which can be used after boot to attach a Red Hat subscription to the resulting instance. The build itself will not attach a subscription or include any content access to the image.

Invoking the build workflows

Example Daisy invocations:

# RHEL 9
daisy -project my-project \
      -zone us-west1-a \
      -var:installer_iso=gs://my-bucket/RHEL9.iso \
      rhel_9.wf.json