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Massimo B.
Veteran
Joined: 09 Feb 2005
Posts: 1771
Location: PB, Germany
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 Posted: Mon Mar 25, 2024 8:40 am Post subject: Booting from multi-device encrypted btrfs, dracut |
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Hello,
when booting from a single-device encrypted btrfs, I usually create a LUKS device and pass the uuids to the ramdisk created by dracut:
| Code: | # grep DEFAULT /etc/default/grub |grep -v "^#"
GRUB_CMDLINE_LINUX_DEFAULT="rd.vconsole.font=ter-u12n rd.vconsole.keymap=de-latin1-nodeadkeys rd.locale.LANG=de_DE.UTF-8 rd.lvm=0 rd.md=0 rd.dm=0 rd.luks.uuid=80122c54-... rd.luks.allow-discards=80122c54-... root=LABEL=gentoo rootflags=subvol=volumes/root video.allow_duplicates=1" |
Using OpenRC, all other LUKS devices I open via /etc/conf.d/dmcrypt .
Now if I like to add another device to btrfs which itself should also be encrypted, how can I make that available via CMDLINE?
Now the next issue is, when I get the 2nd device opened as well, I don't like to enter the same password again. I could use a keyfile stored on the first device which is opened by password. But having the first device opened, the btrfs filesystem is not ready yet without the 2nd device.
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sublogic
Apprentice
Joined: 21 Mar 2022
Posts: 222
Location: Pennsylvania, USA
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| Posted: Tue Mar 26, 2024 2:17 am Post subject: |
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| Cryptsetup can store "tokens" and passphrases in a kernel keyring, and use that before prompting for a passphrase. I've never done it myself and I don't know if dracut supports it. The only docs I could find are in /usr/share/doc/cryptsetup-2.6.1/v2.0.0-ReleaseNotes.bz2, under the header "Tokens and auto-activation". You may have to create a custom initramfs... |
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Installing Gentoo
