Jessie does not boot (GRUB2 complains with "mduuid not found"
Hi all!
Currently I have an old machine without hardware virtualization
support, which I was using for testing using Jessie i686 and LXC.
I tried to migrate that installation to amd64 architecture but
things did not went as well as I would have liked and I had to
reinstalling the operating system using on this time an amd64
netinstall CD.
The idea was to re-install without losing the containers I had
created. After finishing the installation process, GRUB failed
to boot with this message:
------------------------------------------------------------------------
error: failure reading sector 0xb30 from 'fd0'
error: disk "mduuid/9c7c52338a6635c48476b6866bc3c650' not found.
Entering rescue mode...
grub rescue>
------------------------------------------------------------------------
This makes me think GRUB is not finding the /boot directory. To
verify the ID for each block device, I've booted using SystemRescueCD:
------------------------------------------------------------------------
root@sysresccd /root % blkid
/dev/loop0: TYPE="squashfs"
/dev/sr0: UUID="2015-03-28-11-54-44-00" LABEL="sysrcd-4.5.2" TYPE="iso9660"
/dev/sda1: UUID="36f333b2-e97c-34c7-69b3-4d7d79d4ef36" UUID_SUB="0a564f8c-ffee-ac2d-811c-498401bb8a77" LABEL="sirius:3" TYPE="linux_raid_member" PARTUUID="1d6fc95d-01"
/dev/sda2: UUID="ad9c38fd-9b82-76b8-7850-b853ef9b86dc" UUID_SUB="a30ad913-4bec-f459-d7a4-ae18ebe759cc" LABEL="sirius:4" TYPE="linux_raid_member" PARTUUID="1d6fc95d-02"
/dev/sda4: UUID="4d970b31-5e9f-82c0-a4f4-aadef688448c" UUID_SUB="33983814-e607-a00f-d60f-fa6a7bc5f869" LABEL="sysresccd:2" TYPE="linux_raid_member" PARTUUID="1d6fc95d-04"
/dev/md3: UUID="104825f4-fde8-4e7a-ada4-336990c8b28b" TYPE="swap"
/dev/md4: UUID="dbe3b076-a909-490a-a158-bfec8be698a9" TYPE="ext4"
/dev/md2: UUID="aH6UpU-85RX-0qPt-eQVO-n2Uu-9lNU-wYnGV4" TYPE="LVM2_member"
/dev/mapper/vms-gaviola--disk: UUID="aaa331dd-b687-4d10-80dc-f04b8931703c" TYPE="reiserfs"
/dev/mapper/vms-pgsql--odoo--disk: UUID="5a2ac84f-02e1-471a-99d2-f9a67c174471" TYPE="reiserfs"
/dev/mapper/vms-odoo2--disk: UUID="c56ab66a-c24e-4580-85c6-a48c7616830d" TYPE="reiserfs"
/dev/mapper/vms-var: UUID="07eeb0ba-01be-4d4d-b56d-12e8d407725e" TYPE="ext4"
/dev/mapper/vms-rootfs: UUID="9eaf8339-8bee-4e80-b5f6-0aa5780c9bf5" TYPE="ext4"
/dev/mapper/vms-democracyos--disk: UUID="79796c37-5488-4cba-9447-4686570ecfbe" TYPE="ext4"
/dev/mapper/vms-democracy--disk: UUID="ce17bc94-10fc-4ef6-be6c-df111de54d5c" TYPE="ext4"
------------------------------------------------------------------------
This is the correspondence with the MD devices:
md2 => LVM physical volume.
md3 => swap
md4 => /boot
------------------------------------------------------------------------
root@sysresccd /root % cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md2 : active raid1 sda4[3]
485224512 blocks super 1.2 [2/1] [_U]
md4 : active raid1 sda2[0]
2045952 blocks super 1.2 [2/1] [U_]
md3 : active raid1 sda1[0]
979392 blocks super 1.2 [2/1] [U_]
unused devices: <none>
------------------------------------------------------------------------
Note: For now it is a single disk, but then I will add another.
Then I mounted the file systems...
------------------------------------------------------------------------
root@sysresccd /root % mount /dev/vms/rootfs /mnt
root@sysresccd /root % mount /dev/md4 /mnt/boot
root@sysresccd /root % mount /dev/vms/var /mnt/var
root@sysresccd /root % mount --bind /dev /mnt/dev
root@sysresccd /root % mount --bind /dev/pts /mnt/dev/pts
root@sysresccd /root % mount --bind /proc /mnt/proc
root@sysresccd /root % mount --bind /sys /mnt/sys
root@sysresccd /root % chroot /mnt /bin/bash
------------------------------------------------------------------------
... to see the IDs for block devices configured in GRUB:
------------------------------------------------------------------------
root@sysresccd:~# grep mduuid /boot/grub/grub.cfg
set root='mduuid/ad9c38fd9b8276b87850b853ef9b86dc'
search --no-floppy --fs-uuid --set=root --hint='mduuid/ad9c38fd9b8276b87850b853ef9b86dc' dbe3b076-a909-490a-a158-bfec8be698a9
set root='mduuid/ad9c38fd9b8276b87850b853ef9b86dc'
search --no-floppy --fs-uuid --set=root --hint='mduuid/ad9c38fd9b8276b87850b853ef9b86dc' dbe3b076-a909-490a-a158-bfec8be698a9
set root='mduuid/ad9c38fd9b8276b87850b853ef9b86dc'
search --no-floppy --fs-uuid --set=root --hint='mduuid/ad9c38fd9b8276b87850b853ef9b86dc' dbe3b076-a909-490a-a158-bfec8be698a9
------------------------------------------------------------------------
But I see no reference to the block shown in the previous
error (mduuid/9c7c52338a6635c48476b6866bc3c650).
Any recommendations to fix this issue?
Thanks in advance.
Kind regards,
Daniel
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