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Getting grub2 running with encrypted root fails
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norg
Tux's lil' helper
Tux's lil' helper


Joined: 23 Aug 2010
Posts: 98
Location: Augsburg (Germany)

PostPosted: Sun Feb 10, 2013 9:15 pm    Post subject: Getting grub2 running with encrypted root fails Reply with quote

Hi,

i'm using gentoo since several years and i have several systems encrypted and working with grub1 and now i wanted to test grub2. I read the gentoo wiki and also the archlinux wiki and i tried this to get it working:
Code:
grub2-install --modules="part_gpt fat ext2" --no-floppy /dev/sda


in /etc/default/grub i have:
Code:
GRUB_CMDLINE_LINUX="cryptdevice=/dev/sda3:root"


and then i run:
Code:
grub2-mkconfig -o /boot/grub2/grub.cfg


But when i reboot, the system says it won't recognize root. So i got it working with this:
Code:
GRUB_DEVICE="/dev/mapper/root"
GRUB_CMDLINE_LINUX_DEFAULT="crypt_root=/dev/sda3"


Why is the second version working? Why is "cryptdevice" not working, what did i miss? I'm just guessing for now that "cryptdevice" instead of "crypt_root" is not supported by genkernel (as i didn't find it in the source)

thanks
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windex
n00b
n00b


Joined: 09 Dec 2012
Posts: 41

PostPosted: Mon Feb 11, 2013 6:18 pm    Post subject: Reply with quote

Thank you for your inquiry. We'll see if we can't get this sorted out. Can you please post /var/log/messages? Might be a clue in there.
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norg
Tux's lil' helper
Tux's lil' helper


Joined: 23 Aug 2010
Posts: 98
Location: Augsburg (Germany)

PostPosted: Mon Feb 11, 2013 7:01 pm    Post subject: Reply with quote

just a testing system for now. but i emerge syslog and post it :)

as i said it's working with crypt_root and i guess that genkernel just doesn't support cryptdevice as i searched through the sourcecode.
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gabrielg
Tux's lil' helper
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Joined: 16 Nov 2012
Posts: 86

PostPosted: Tue Feb 12, 2013 3:07 pm    Post subject: Reply with quote

If you are using genkernel, then you have to use crypt_root, as specified in the manual.
I'm assuming that your kernel is in your boot partition (as opposed to the root partition), hence grub2 doesn't have to do any decryption.
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norg
Tux's lil' helper
Tux's lil' helper


Joined: 23 Aug 2010
Posts: 98
Location: Augsburg (Germany)

PostPosted: Wed Feb 13, 2013 7:07 pm    Post subject: Reply with quote

yes, was just confusing with the documentation from other distris.
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