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-   -   almost upgraded ext4 LUKS and LVM to 3.7.1, but missing /proc/partitions ... (http://www.linuxquestions.org/questions/slackware-14/almost-upgraded-ext4-luks-and-lvm-to-3-7-1-but-missing-proc-partitions-4175443187/)

brodo 12-27-2012 07:26 PM

almost upgraded ext4 LUKS and LVM to 3.7.1, but missing /proc/partitions ...
 
Well, I (almost) upgraded my encryped LUKS/LVM ext4 volumes to the latest current 3.7.1-smp kernel, but rebooting failed.

The action after booting from 13.37 pendrive was as follows:

cryptsetup luksOpen /dev/hda2 slackluks
vgscan --mknodes
vgchange -ay
mkswap /dev/cryptvg/swap

mount /dev/cryptvg/root /root
chroot /root
Next I mounted /dev/sda1 as /boot and issued:

mkinitrd -c -k 3.7.1-smp -m ext4 -f ext4 -r /dev/cryptvg/root -C /dev/sda2 -L

then mkinitrd and lilo warned about non existing /proc/partitions file.
Rebooting failed. Why ?

How to pass the proper content of the /proc/partitions file into the chrooted environment ?

Darth Vader 12-27-2012 07:37 PM

mount --bind /proc /root/proc

BUT, I for one, I will want to mount an temporary mountpoint into /mnt/tmp or /mnt from an installation system, instead of /root.

brodo 12-28-2012 03:54 AM

Well, I did that, but no luck ...
Rebooting lands only on "BIOS data check successful" message at boot, not going forward as it always did.

In the meantime I copied the content of the /proc/partitions into the text file named "partitions" and placed it after chrooting directly into the already empty /proc directory.
That way, both mkinitrd and lilo seemed to be working properly, issuing typical messages.

But rebooting machine stopped at "BIOS data check successful" again ...

Darth Vader 12-28-2012 06:53 AM

For using an encrypted root filesystem you need an separate /boot partition, which is not encrypted.

The BIOS boot loader is not capable directly to use an encrypted device as boot device. The "problem" is common also to Windows (7/8), which use an separate boot partition (aka system partition) with 100MB size, for be able to boot an encrypted disk C:.

brodo 12-28-2012 08:04 AM

I have a separated and unencrypted /dev/sda1 as boot partition!

My LVM/Luks combination on the older machine worked like a charm for several years, surviving lots of kernel upgrades including the 3.7.1 one.
The one difference is that it uses ext3 as a main filesystem.

My newer LVM/Luks machine uses ext4 and I have an upgrading problem with it.

Stephen Morgan 12-28-2012 08:11 AM

Shouldn't /dev/hda be /dev/sda?

You also need to mount --bind /proc /root/proc, and the same with /dev and /sys, before chroot. Then mount your /boot partition.

Can't install lilo if you haven't bound /dev to /root/dev, certainly.

brodo 12-28-2012 09:22 AM

Of course, we're talking about /dev/sda, not the hda - it is a typo from ancient times ...
All I entered was certainly /dev/sda based, otherwise nothing could be done.

For now, I'll try this:

1. mount --bind /proc /root/proc, and the same with /dev and /sys, before chroot.
2. after chroot - mount /boot partition.

We'll see what happens, but upgrading my older ext3 based LVM/Luks machine didn't need these steps at all.

brodo 12-28-2012 11:49 AM

I did that.
But after chrooting I see empty /proc and /sys directories and mkinitrd/lilo make usual warnings. :-(

brodo 12-28-2012 04:27 PM

Thanks to all of you - problem is solved - there was a mismatch in defining vmlinuz in /etc/lilo.conf .


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