Working with GRUB

Now we're going to interact with GRUB. We will add a custom boot entry. This will be presented upon reboot.

Before you work with GRUB, always make a backup copy of your /boot/grub/grub.conf.

We will use the vi command, which will open /boot/grub/grub.conf in the visual editor:

[root@localhost ~]# cat /boot/grub/grub.conf
 # grub.conf generated by anaconda
 #
 # Note that you do not have to rerun grub after making changes to this file
 # NOTICE: You have a /boot partition. This means that
 # all kernel and initrd paths are relative to /boot/, eg.
 # root (hd0,0)
 # kernel /vmlinuz-version ro root=/dev/sda2
 # initrd /initrd-[generic-]version.img
 #boot=/dev/sda
 default=0
 timeout=5
 splashimage=(hd0,0)/grub/splash.xpm.gz
 hiddenmenu
 title CentOS (2.6.32-431.el6.x86_64)
 root (hd0,0)
 kernel /vmlinuz-2.6.32-431.el6.x86_64 ro root=UUID=05527d71-25b6-4931-a3bb-8fe505f3fa64...