Login to Remote-Console first, so you can see boot messages, … and kernel panics, if unlucky
Re-Install takes 1h
Set Boot mode to recovery in “RecoveryManager” at https://config.stratoserver.net/ Wait for 15-20min!! until “ServerData” Serverstatus shows: Installation finished
Strato sets RAIDs to /md/126 and md127 - that sucks! - via grub install, …,.. you can mess up the system
log in to recovery via
ssh root@IP # recovery root passwd is shown in "Serverdata" mount /dev/md127 /mnt/ # system partition mount /dev/md126 /mnt/boot/ # boot partition
to re-install grub, you need to chroot
mount -o bind /dev /mnt/dev mount -t proc none /mnt/proc/ mount -t sysfs none /mnt/sys
chroot /mnt update-grub ( grub-mkdevicemap # In case of error “no such disc” )
grub-install /dev/sda grub-install /dev/sdb
To exit the recovery console you need to set boot mode to normal and wait 10min until “ServerData” Serverstatus shows: Installation finished
You need to setup your ssh key in the webmanager to enter in rescue mode without password! the password will be sent by mail as well.
- Change netboot mode in web-manager: set to “rescue” - Click “reboot”
mkdir /mnt/md2 mount /dev/md2 /mnt/md2/
After restore, click “netboot” in webmanager again and reset it to “harddisc”
If the system does not boot anymore, you can open the encrypted device anyway with a live system on USB stick or CD.
# find the correct partitions: fdisk -l # open the container: cryptsetup luksOpen /dev/sdXY sdXY_crypt # activate the LVM volume group: vgchange -ay # find new volume groups in /dev/mapper/ and mount them (maybe it's just root or home, var, ...might be in, too): mount /dev/mapper/ubuntu--vg-root /mnt # mount the unencrypted boot parti: mount /dev/sdXZ /mnt/boot # bind mount some important dirs: mount -t proc proc /mnt/proc mount -o bind /dev /mnt/dev mount -t sysfs none /mnt/sys
Now you can take your data back already.
To repair what is broken, you probably need to change root into that system:
All following commands are executed inside the broken system. Some hints for repairs:
apt install lvm2 # debian uninstalled lvm during an upgrade :(
If your root system is BTRFS, you need btrfs-progs and the kernel module during the early initramfs boot stage:
apt install btrfs-progs
Add a missing module to initramfs - inside the chroot:
Write one module name like “btrfs” per line.
Then regenerate the initramfs for all installed kernels:
update-initramfs -u -k all
Also check the UUID entries in /etc/crypttab compared to ls -la /dev/disk/by-uuid/
TbC.. There may be various other reasons for bootproblems…