Fedora – Configuration as Xen host (EFI preference)

I've installed a new Fedora box as a Xen host (Dom0), which turns out a little harder than expected.

First stop – install Xen via DNF and reboot. Find that the Xen boot option failed (a lot of errors regarding multiple boot). After some research on Google, I learn that it is because the multi-boot has been removed for security reasons.[1]

Ok – well it's annoying. Looks like I have two options [2]:

  • Reconfigure GRUB manually to use the old behavior of the string loader
  • Bypass GRUB and use Xen as an EFI boot loader

I'm leaving for option 2 because it seems to be a cleaner solution and does not require manipulating the shell script layers that have been built around GRUB these days to make it do what I want.

I arrived at creating an EFI boot option for Xen, but it seems like this option is ignored at startup. No error, no useful output. I do not know what to check next.

What I have up to here:

The EFI partition has EFI / xen with:

  • xen.efi (copy of EFI / fedora / xen-4.11.1.efi)
  • Copies of initramfs & vmlinuz from / boot
  • xen.cfg

xen.cfg text:


default = fedora

options =
kernel = vmlinuz root = / dev / nvme0n1p1 rhgb LANG = en_GB.UTF-8
ramdisk = initramfs.img

EFI option created with the help of:

efibootmgr -c -L Xen -d / dev / sdc -p 1 -l \ EFI \ xen \ xen.efi -c

The target state here is: The machine starts with Xen and a Fedora Dom0. What should I check or what should I try next?

[1] https://access.redhat.com/security/cve/cve-2015-5281

[2] https://wiki.xenproject.org/wiki/Xen_EFI

popup – Preference: info-tips or fixed information areas for point clouds?

I've seen two different ways to display information on a point of a point cloud

  1. A tooltip (tooltip) that appears next to your cursor
  2. When you hover over a point, the information appears in the same place, regardless of which point you clicked (at the bottom or side or on the graph).

There are advantages for both. I hoped to find best practices for these two ways of displaying information.

What do people usually prefer?

a true tooltip has the advantage of always being close to your point of view; your eyes do not need to travel far to access information.
On the other hand. I can see where it would be annoying to continually see the tooltip flashing day by day as you move between 300 and 400 different data points.

Are there any remote administration tools for iPad? Sharing screen preference

I have an older friend who has an iPad and calls every few days with problems. Making technical support remotely over the phone becomes tedious.

Is there anything comparable for the iPad to the Mac screen sharing options to Mac? Search in Google contains only applications that allow you to administer a Mac from an iPad.