On Mon, 11 Jul 2016 16:45:55 +0300
Kevin Wilson <wkev...@gmail.com> wrote:

> Hi,
> Thanks Todd.
> The thing is that now CentOS is installed and it is the current
> control and it indeed uses an older grub. So what do you suggest ?

In the old grub, there used to be a command to switch immediately to
the configuration file for another installation.  I looked for how I
used to do that, but I haven't got any installations with old grub
left.  It's been years since fedora switched to grub2.

I think the command is called configfile.

Install the documentation for grub, and install pinfo on your centos.
Then do 
pinfo grub
and you should get the info files for grub.  Look for the command
configfile, and create a stanza pointing to the location of the grub
start file of f24, /boot/grub2/grub.cfg in your centos grub config file.

When you boot centos, and then select that menu entry, it should then
boot f24 using the f24 config file. That's how it used to work when
both were grub, I'm not sure what happens if switching from grub to
grub2.

The other option is to use the chainloader command, but I never had
very good luck with that.
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