The dracut tool has replaced the use of mkinitrd. Also, the /etc/modprobe.conf file is no longer used by default in the management of kernel modules, however it can still be used if manually created. Refer to the following for an example usage of the dracut tool.:

# mv /boot/initramfs-$(uname -r).img /boot/initramfs-$(uname -r)-new.img
# dracut --force /boot/initramfs-$(uname -r).img $(uname -r)