Hetzner Rescue with Ubuntu Software Raid

Activation of rescue system

• https://robot.your-server.de
  • Login
• -> Server
• Select server -> Rescue -> 64bit -> Activate rescue system
• Note root password !!!
• ssh root@ex.ample.com

Fix grub2

• blkid
  • assumes boot partition is md1 and root is md2
• mount /dev/md2 /mnt;mount /dev/md1 /mnt/boot;mount -t dev -o bind /dev /mnt/dev;mount -t proc -o bind /proc /mnt/proc;mount -t sys -o bind /sys /mnt/sys;chroot /mnt
• Or separate commands:
  • mount /dev/md2 /mnt
  • mount /dev/md1 /mnt/boot
  • mount -t dev -o bind /dev /mnt/dev
  • mount -t proc -o bind /proc /mnt/proc
  • mount -t sys -o bind /sys /mnt/sys
  • chroot /mnt
• vi /etc/default/grub
  • Fix settings e.g.
    GRUB_RECORDFAIL_TIMEOUT=5
• update-grub
• exit
• reboot

Resources

https://wiki.hetzner.de/index.php/Hetzner_Rescue-System/en

https://michaelfranzl.com/2014/01/29/remote-server-hetzner-rebooting/