Altering the default boot option on CentOS

Question

I recently installed a copy of CentOS onto my main hard drive (I now have Windows 7 and CentOS). Whilst installing CentOS, I accidentally set it to be the main boot option, so when I start my PC I have three seconds to select Windows 7 or it automatically boots into CentOS. I would rather Windows 7 be the default option -- how can I change it?

Answer 1

CentOS uses GRUB for its bootloader. There's a page in the CentOS install guide that covers modifying GRUB's configuration. First, you need to open /boot/grub/grub.conf in a text editor, but the text editor needs to be running as root so you'll have permission to edit the file. One way is to run this in a terminal:

$ sudo gedit /boot/grub/grub.conf

Once you have the file open, look for default near the beginning. The options are 0-indexed, so if it says default 0 it means it'll default to the first option in the list. Change it to e.g. default 1 if Windows 7 is the second option