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| #/boot/grub/grub.conf 缺失：
yum install -y grub
grub-mkconfig -o /boot/grub/grub.conf
#/boot/grub2/grub.cfg 缺失：
yum install -y grub2
grub2-mkconfig -o /boot/grub2/grub.cfg
uname -a
sudo grep ^menuentry /boot/grub2/grub.cfg | awk -F\' '{print $2}' | nl -v0
sudo grub2-editenv list
sudo grep GRUB_DEFAULT /etc/default/grub
sudo vim /etc/default/grub
sudo grub2-set-default 1
sudo grub2-mkconfig -o /boot/grub2/grub.cfg
sudo dracut --force
sudo reboot
uname -a
|