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GOS
Tux's lil' helper
Joined: 09 Sep 2010
Posts: 102
Location: Germany
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 Posted: Sun Feb 11, 2018 4:44 pm Post subject: Problems with an encrypted root partition and genkernel |
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Hello,
on my laptop, I use the following hdd-setup:
| Code: | sda1 = efi-partition
sda2 = boot-partition
sda3 = luks-partition |
On the luks-partition resides the lvm-volume-group vg0. vg0 is divided into swap and root
I made an initramfs via genkernel with "genkernel --luks --lvm --symlink initramfs". (Tried this also with genkernel-next)
Now, grub calls
| Code: | set root=hd0,2
linux /boot/KernelImage
initrd /boot/initramfs
crypt_root=/dev/sda3 dolvm root=/dev/mapper/vg0-root |
The result (and the problem) is that the initramfs does not ask for a password:
| Code: |
>> Loading modules
blabla
:: Loading from crypto:
:: Loading from virtio:
>> Initializing root device...
!! Could not find the root block device in .
!! Please specify another value or:
blabla
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What I am doing wrong?
PS: Without the luks-thing the whole efi-thing and my kernel works well.
PPS: If I go into generkel's shell, the cryptsetup luksOpen /dev/sdb3 luks-dev seems to work
PPPS: Also with UUID's there is no success |
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GOS
Tux's lil' helper
Joined: 09 Sep 2010
Posts: 102
Location: Germany
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| Posted: Sat Feb 17, 2018 10:00 pm Post subject: |
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Weather genkernel nor dracut works for me.
Now, I use a custom initramfs which does the trick. The following script creates the initramfs:
| Code: |
#!/bin/bash
#----------------------------------------------------------------------
# Generate neccessary directories and copy necessary files
#----------------------------------------------------------------------
mkdir -p /var/tmp/BuildInitramfs/{bin,dev,etc/lvm,lib,lib64,mnt/root,proc,root,run/blkid,run/lock/lvm,run/lvm,run/cryptsetup,sbin,sys,usr}
cp /bin/busybox /var/tmp/BuildInitramfs/bin
cp /sbin/lvm.static /var/tmp/BuildInitramfs/sbin
cp /sbin/cryptsetup /var/tmp/BuildInitramfs/sbin
#---------------------------
# Generate etc/lvm/lvm.conf
#---------------------------
cat << EOF > /var/tmp/BuildInitramfs/etc/lvm/lvm.conf
global {
use_lvmetad = 0
}
activation {
udev_sync = 0
udev_rules = 0
}
devices {
issue_discards = 1
}
EOF
#--------------------------
# Generate the init-script
#--------------------------
cat << EOF > /var/tmp/BuildInitramfs/init
#!/bin/busybox sh
# Define the rescue_shell
rescue_shell(){
echo "Es gab Funktionsprobleme. Oeffne die Notfall Shell."
busybox --install -s
exec /bin/sh
}
# Mount /dev, /proc and /sys filesystems
mount -t devtmpfs none /dev
mount -t proc none /proc
mount -t sysfs none /sys
# Deactivate useless kernel messages
echo 0 > /proc/sys/kernel/printk
# Decrypt the drive
echo ""
echo "======================"
echo " Decrypt HDD for boot"
echo "======================"
echo ""
cryptsetup --allow-discards luksOpen /dev/sdb3 CryptoDev1
wait
# Activate the lvm volume group
lvm.static vgscan --mknodes
lvm.static lvchange -a ly CryptoVg1/root
lvm.static vgscan --mknodes
wait
# Mount the root-partition
mount -o ro /dev/mapper/CryptoVg1-root /mnt/root || rescue_shell
wait
# Clean up
echo 1 > /proc/sys/kernel/printk
mount --move /proc /mnt/root/proc
mount --move /sys /mnt/root/sys
mount --move /dev /mnt/root/dev
wait
# Switcheroo
exec switch_root /mnt/root /sbin/init
EOF
chmod a+rx /var/tmp/BuildInitramfs/init
#-----------------------
# Build the Initramfs
#-----------------------
cd /var/tmp/BuildInitramfs
find . -print0 | cpio --null -ov --format=newc | gzip -9 > /boot/Initramfs.cpio.gz
cd /
#--------------------------------
# Delete temporary files
#--------------------------------
rm -rf /var/tmp/BuildInitramfs
exit
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