Remove Nvidia & Nouveau kernel modules from initramfs and make persistent

remove_nvidia_from_initramfs.sh

#!/bin/bash
# Removes both nvidia and nouveau drivers from initramfs and rebuilds them.
export PATH=/bin:/usr/bin:/sbin:/usr/sbin

if [[ $( id -u ) -ne 0 ]]
then
    echo "This must be run as root"
    exit 1
else
    kernelversion=$(uname -r)
    timestamp=$(date -u +%Y%m%d-%H%m%S)

    # backup current initramfs
    cp /boot/initramfs-${kernelversion}.img /boot/initramfs-${kernelversion}.img.${timestamp}.bak

    # rebuild the initramfs image
    dracut --omit-drivers "nvidia nouveau" -f

    # exclude nvidia from future kernel upgrades and initramfs rebuilds
    if [[ ! -f /etc/dracut.conf.d/omit-nvidia.conf ]]
    then
        echo "omit_dracutmodules+=\" nvidia \"" >> /etc/dracut.conf.d/omit-nvidia.conf
    fi

    if [[ ! -f /etc/dracut.conf.d/omit-nouveau.conf ]]
    then
        echo "omit_dracutmodules+=\" nouveau \"" >> /etc/dracut.conf.d/omit-nouveau.conf
    fi

    # update grub2
    grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg

    # backup current kdump initramfs
    cp /boot/initramfs-${kernelversion}kdump.img /boot/initramfs-${kernelversion}kdump.img.${timestamp}.bak

    # add blacklist to omit nvidia from kdump initramfs
    grep -q "rd\.driver\.blacklist=nvidia,nouveau" /etc/sysconfig/kdump
    if [[ $? -ne 0 ]]
    then
        sed -i '/^KDUMP_COMMANDLINE_APPEND=/s/"$/ rd.driver.blacklist=nvidia,nouveau"/' /etc/sysconfig/kdump
    fi

    # restart kdump service to pick up changes to kdump's initrd
    kdumpctl restart

    # rebuild kdump initramfs
    mkdumprd -f /boot/initramfs-${kernelversion}kdump.img

    # need reboot to take effect
    echo "$(uname -n): DONE initramfs changes - REBOOT needed to take effect"
fi