I believe this is coming from /boot/initrd
As root:
cd /root
cp /boot/initrd ./initrd.gz
gzip -d initrd.gz
mkdir initDisk
cd initDisk
cpio -i <…/initrd
vim etc/resolv.conf # make your changes here
find . | cpio --create --format=‘newc’ >…/newInitrd
cd …/
gzip newInitrd
mv /boot/initrd /boot/initrd_original
cp newInitrd.gz /boot/initrd