[SOLVED] Clarification on LUKS system installed on USB Flash Drive

I'm trying to install Arch with LUKS on a flash drive. To do that, I have partitioned it as follows:
# blkid
/dev/sdb1: UUID="EA15-01CE" TYPE="vfat"
/dev/sdb2: UUID="23b2be0d-7eb8-48e1-9da6-bd56f7bfd741" TYPE="ext2"
/dev/sdb3: UUID="1bf28f95-fd45-4b02-806b-2338f95eb22d" TYPE="crypto_LUKS"
/dev/mapper/cryptroot: UUID="30d10da4-62d3-440d-af9e-0bd79b6fb8fb" TYPE="ext4"
/dev/sdb1 is a 600 MB FAT32 partition for data, /dev/sdb2 is an ext2 /boot partition, and /dev/sdb3 contains the encrypted root.
The wiki article on installing Arch Linux on a USB key states that I need to have udev rules for specially mounting th root filesystem, since the drive mappings can change (https://wiki.archlinux.org/index.php/In … ash_memory). Do I really need to do that, since it is already being mounted into /dev/mapper? My grub2 configuration looks like this, does it seem right?
GRUB_DEFAULT=0
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="Arch"
GRUB_CMDLINE_LINUX_DEFAULT="quiet"
GRUB_CMDLINE_LINUX="cryptdevice=/dev/disk/by-uuid/1bf28f95-fd45-4b02-806b-2338f95eb22d:cryptroot"
... rest is the default /etc/grub/default/ ...
I've already added the "encrypt" hook to mkinitcpio.
Also, here is my fstab:
# /etc/fstab: static file system information
# <file system> <dir> <type> <options> <dump> <pass>
/dev/mapper/cryptroot / ext4 defaults,noatime 0 1
/dev/disk/by-uuid/23b2be0d-7eb8-48e1-9da6-bd56f7bfd741 /boot ext2 defaults, noatime 0 2
My question is, does this seem okay? I cannot test this right now since I only have access to an old Fedora machine which I am not allowed to reboot.
Last edited by nagaseiori (2013-03-19 03:19:45)

Well I think it looks ok, but I would change fstab into this:
# /etc/fstab: static file system information
# <file system> <dir> <type> <options> <dump> <pass>
UUID="30d10da4-62d3-440d-af9e-0bd79b6fb8fb / ext4 defaults,noatime 0 1
UUID=23b2be0d-7eb8-48e1-9da6-bd56f7bfd741 /boot ext2 defaults, noatime 0 2
Probably your GRUB_CMDLINE_LINUX will work too.
Altough I use this in my grub.cfg
linux /vmlinuz-linux root=/dev/mapper/ch-ro ro cryptdevice=/dev/sda2:ar ro quiet

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s1ln7m4s7r wrote:
For what i can see from the log there is no problem.
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https://wiki.archlinux.org/index.php/PC … ge_devices
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Last edited by 4on6 (2012-04-16 12:57:01)

4on6 wrote:Create two new partitions - with gparted p.ej.? And do I have to worry about the filesystems - must they be the same like for the original partitions on my hard-disk?
I prefer Gparted, it's easy as cake
The filesystems don't have to be the same as the original partitions. I prefer ext4 (universally supported) or jfs (uses very little CPU), but I recommend you ext4.
In fact, you can use a hard drive instead of a flash drive and this is how you clone a Linux installation manually!
4on6 wrote:So I mount both - source and destination partitions (/mnt/dest/ suggests it ...)?
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4on6 wrote:I've seen those UUIDs as output of a linux command (mount? fdisk?), but I don't recall which one - how do I get these UUIDs?
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4on6 wrote:Do I send this command from the live Arch-CD, and is it the only command necessary (I have not much experience with grub)?
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4on6 wrote:I will ...
Be very careful, I didn't and lost ALL my files by mistake in typing. Triple-check the directory you are currently working in! ALWAYS make a backup!
4on6 wrote:Great that this is possible, hope I manage to get it done. Thanks again.
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