The way grub entries are defined in centos 7 has changed. Instead of using grub.conf, grub2 now uses /boot/grub2/grub.cfg, with content generated from scripts in /etc/grub.d/ [root@localhost grub.d]# ll total 64 -rwxr-xr-x. 1 root root 8698 Jun 30 2014 00_header -rwxr-xr-x.…