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CentOS is a community-supported, free and open source operating system based on Red Hat Enterprise Linux. It exists to provide a free enterprise class computing platform and strives to maintain 100% binary compatibility with its upstream distribution. CentOS stands for Community ENTerprise Operating System. CentOS developers use Red Hatâs source code to create a final product very similar to Red Hat Enterprise Linux. CentOS is available free of charge. Technical support is primarily provided by the community via official mailing lists, web forums, and chat rooms.
up vote 2 down vote. 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: Once you have the file open, look for default near the beginning.he 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. share | improve this answer. answered Jan 9 '12 at 7:12.