Set the default startup entry for CentOS 7

Installing CentOS 7 and Windows 7 dual systems, you want to start Windows 7 by default, and find that CentOS 7 and previous versions modify the default startup items as if they had changed, mainly because CentOS grub used GRUB2, and the change in boot sequence was simple:

# Grub2-set-default ' Fedora, with Xen hypervisor '

Using the Grub2-set-default command, the following parameter is the name you want to start the system by default, and you can view it after the modification is complete:

# grub2-editenv List

Detailed you can refer to: http://www.fclose.com/3826/setting-default-entry-in-grub2-and-grub/