Intro¶
The pvgrub binary in Debian Jessie (dom0) is not "happy" about the fact that in Fedora (domU) /boot is on a separate partition and
that the grub config is stored in /boot/grub2/grub.cfg.
Errors seen when starting a domU with this setup
# xl create /etc/xen/<domU>.cfg -c Parsing config from /etc/xen/<domU>.cfg error: no such device: /boot/xen/pvboot-x86_64.elf. error: no such device: /xen/pvboot-x86_64.elf. error: no such device: /boot/grub/grub.cfg. GNU GRUB version 2.02~beta2-22 Minimal BASH-like line editing is supported. For the first word, TAB lists possible command completions. Anywhere else TAB lists possible device or file completions. grub>
A quick fix is to create a symlink grub.cfg -> /grub2/grub.cfg
Howto fix from dom0¶
Mount disk (if /boot is the first partition of the disk)
# losetup -f /dev/vg_raid1/<domu>-volume # kpartx -av /dev/loop0 add map loop0p1 (253:21): 0 1024000 linear /dev/loop0 2048 add map loop0p2 (253:22): 0 11556864 linear /dev/loop0 1026048 # mount /dev/mapper/loop0p1 /mnt
Add symlink
# cd /mnt/ # mkdir -p boot/grub # cd boot/grub/ # ln -s /grub2/grub.cfg grub.cfg
Clean-up
# cd / # umount /mnt # kpartx -dv /dev/loop0 del devmap : loop0p2 del devmap : loop0p1 # losetup -d /dev/loop0
After this pvgrub should be able to bring up the grub menu in the Fedora domU.