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Ubuntu: Add some troubleshooting instructions

Richard Laager 2016-10-04 01:02:38 -05:00
parent 7b8c3b7c12
commit bb0a37c973
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32
Ubuntu-16.04-Root-on-ZFS.md

@ -418,6 +418,38 @@ If you prefer the graphical boot process, you can re-enable it now. It will make
## Troubleshooting
### Rescuing using a Live CD
Boot the Live CD and open a terminal.
Become root and install the ZFS utilities:
$ sudo -i
# apt update
# apt install --yes zfsutils-linux
This will automatically import your pool. Export it and re-import it to get the mounts right:
# zpool export -a
# zpool import -N -R /mnt rpool
# zfs mount rpool/ROOT/ubuntu
# zfs mount -a
If needed, you can chroot into your installed environment:
# mount --rbind /dev /mnt/dev
# mount --rbind /proc /mnt/proc
# mount --rbind /sys /mnt/sys
# chroot /mnt /bin/bash --login
Do whatever you need to do to fix your system.
When done, cleanup:
# mount | grep -v zfs | tac | awk '/\/mnt/ {print $3}' | xargs -i{} umount -lf {}
# zpool export rpool
# reboot
### MPT2SAS
Most problem reports for this tutorial involve `mpt2sas` hardware that does slow asynchronous drive initialization, like some IBM M1015 or OEM-branded cards that have been flashed to the reference LSI firmware.

32
Ubuntu-16.10-Root-on-ZFS.md

@ -430,6 +430,38 @@ If you prefer the graphical boot process, you can re-enable it now. It will make
## Troubleshooting
### Rescuing using a Live CD
Boot the Live CD and open a terminal.
Become root and install the ZFS utilities:
$ sudo -i
# apt update
# apt install --yes zfsutils-linux
This will automatically import your pool. Export it and re-import it to get the mounts right:
# zpool export -a
# zpool import -N -R /mnt rpool
# zfs mount rpool/ROOT/ubuntu
# zfs mount -a
If needed, you can chroot into your installed environment:
# mount --rbind /dev /mnt/dev
# mount --rbind /proc /mnt/proc
# mount --rbind /sys /mnt/sys
# chroot /mnt /bin/bash --login
Do whatever you need to do to fix your system.
When done, cleanup:
# mount | grep -v zfs | tac | awk '/\/mnt/ {print $3}' | xargs -i{} umount -lf {}
# zpool export rpool
# reboot
### MPT2SAS
Most problem reports for this tutorial involve `mpt2sas` hardware that does slow asynchronous drive initialization, like some IBM M1015 or OEM-branded cards that have been flashed to the reference LSI firmware.