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Old 12-14-2013, 05:58 AM   #1
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Registered: Dec 2013
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Problems booting from LUKS on top of LVM

Hello all, I'm new to this forum although I've been lurking for a long time now.

As the subject says, I'm having trouble booting a LUKS encrypted root filesystem inside LVM. The problem is that while booting the system doesn't ask for the passphrase and skips mounting the root filesystem thus failing to boot.

I have a single HDD that I divided in 2 partitions, one for /boot and another for LVM. The LVM is divided in several partions (root, home and swap) each one encrypted with their own LUKS passphrase or key.

I did all this setup while installing the system (debian), and everything worked flawlessly, but then I decided to upgrade to the testing branch and that updated my kernel. Now I can't boot using that newly kernel (however I still can use the old one).

I've been googling and searching here for a long time and most of the solutions I found are for LVM inside LUKS, and my setup is the opposite, so they didn't work for me.

As the GRUB commands are the same for both kernels and I added all lvm and crypt related modules to /etc/initramfs-tools/modules and I did not forget to run update-initramfs I suppose this has to do with something in the configuration, but I can't find where my mistake is.

Any ideas on what to do or pointers to where to look for more info?
I wanted to have LUKS inside LVM and not the other way so that later on I can add more hard disks without trouble.

Thanks in advance!
Old 12-20-2013, 06:17 AM   #2
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Registered: Dec 2013
Posts: 6

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Also, if I copy /usr/share/initramfs-tools/hooks/lvm2 to /etc/initramfs-tools/hooks/lvm2, when I call update-initramfs I get an error about a symbolic link unable to be created because it already exists...

Maybe that's the problem? But I do not know how to solve it.

I also copied the cryptsetup and udev hooks and I have some udev scripts in /etc/initramfs-tools/scripts/init-top and init-bottom

Please anyone?

EDIT: I found a line in the booting process that says: Begin: Loading essential drivers ... modprobe: module lvm2 not found in modules. dep
Then divice-mapper kicks in and then it runs /scripts/init-premount and tries to mount the root filesystem but skips everything.
If I wait a bit I get dropped to the initramfs console but just before that it tells me to check cryptopts=source= bootarg: cat /proc/cmdline or missing modules, devices: cat /proc/modules; ls /dev and something about module ehci-orion not found.
In the initramfs console, if I run cat /proc/modules | grep -i lvm I get nothing Why isn't it being loaded??

Last edited by nake; 12-20-2013 at 06:32 AM.
Old 12-30-2013, 05:59 AM   #3
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Registered: Dec 2013
Posts: 6

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I fixed it!
I found that the problem was LVM and not LUKS, so I duckduckgoed and found this post:
Where the OP said that he fixed it by editing this in /etc/default/grub:
GRUB_CMDLINE_LINUX="lvmwait=/dev/mapper/<whatever_your_root_is> rootdelay=20"
Remember to update-ramfs and that's all folks (^.^)


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