08-24-2006
Suppose that CentOS is the default OS, so if the user does not interact with grub, CentOS will boot automaticly. The CentOS startup scripts could fiddle with grub.conf (or use grub's saveddefault concept) so that Redhat is now the default OS. Each OS could arrange for the next OS to be the default in the same way. Now give each OS a cron job that reboots the box, say, every 2 hours. Now the box will cycle through all of the OS's in turn every 2 hours. Maybe that would be good enough.
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LEARN ABOUT CENTOS
grub-reboot
GRUB-REBOOT(8) System Administration Utilities GRUB-REBOOT(8)
NAME
grub-reboot - set the default boot entry for GRUB, for the next boot only
SYNOPSIS
grub-reboot [OPTION] MENU_ENTRY
DESCRIPTION
Set the default boot menu entry for GRUB, for the next boot only.
-h, --help
print this message and exit
-V, --version
print the version information and exit
--boot-directory=DIR
expect GRUB images under the directory DIR/grub instead of the /boot/grub directory
MENU_ENTRY is a number, a menu item title or a menu item identifier. Please note that menu items in submenus or sub-submenus require speci-
fying the submenu components and then the menu item component. The titles should be separated using the greater-than character (>) with no
extra spaces. Depending on your shell some characters including > may need escaping. More information about this is available in the GRUB
Manual in the section about the 'default' command.
REPORTING BUGS
Report bugs to <bug-grub@gnu.org>.
SEE ALSO
grub-set-default(8), grub-editenv(1)
The full documentation for grub-reboot is maintained as a Texinfo manual. If the info and grub-reboot programs are properly installed at
your site, the command
info grub-reboot
should give you access to the complete manual.
grub-reboot (GRUB) 2.02-2ubuntu8.3 July 2018 GRUB-REBOOT(8)