On-cluster layering example is not valid. The 'cowsay' package is not available in RHEL, so the example will always fail.     

OCP 4.17    

100%    

Follow https://docs.openshift.com/container-platform/4.17/machine_configuration/mco-coreos-layering.html#coreos-layering-configuring-on_mco-coreos-layering which currently contains the following Dockerfile example:

    FROM configs AS final
    RUN rpm-ostree install cowsay && \
        ostree container commit
    

The rpm-ostree command will return an error that the cowsay package is not found, causing the MachineOSBuild to fail.     

The example includes a config that can be successfully built.     

I've not been able to successfully test it due to other issues, but we may want to consider using rsyslog in the example.