Cannot access device during cryptsetup

[yeehi]

I am trying to follow the Automatically Unlock LUKS Encrypted Drives With A Keyfile tutorial here (http://www.howtoforge.com/automatically-unlock-luks-encrypted-drives-with-a-keyfile).

At the command below I receive an error message:

sudo cryptsetup luksAddKey /dev/sdX /root/keyfile
Command failed: Can not access device

What should I do?

This is an AMD64 alternate installation of Jaunty Jackalope.

[bodhi.zazen]

you need to specify the device

sdxy or sdx needs to change to the proper patition

/dev/sda1

if you do not know the partition see :

HowTo: Partitioning Basics - Ubuntu Forums (http://ubuntuforums.org/showthread.php?t=282018)

probably same with /root/keyfile , unless you named it "keyfile"

[yeehi]

Oh thank you for such swift help! :)

So, would I use /dev/mapper/sdb5_crypt instead of sdxy?

sudo cryptsetup luksAddKey /dev//dev/mapper/sdb5_crypt /root/keyfile


If I wanted to do the same thing for other encrypted partitions, such as /opt and /home, would I need to do something extra or different?

Thank you very much, again!

[bodhi.zazen]

no, no, the other /dev, :lolflag:

In your case I think /dev/sda5

[yeehi]

sudo cryptsetup luksAddKey /dev/mapper/sdb5 /root/keyfile
[sudo] password for ****:
Command failed: Can not access device

****ubuntu:~$ sudo cryptsetup luksAddKey /dev/mapper/sda5 /root/keyfile
Command failed: Can not access device


I still can´t get it to go... :confused:

[bodhi.zazen]

Where did you get mapper from ?

sudo cryptsetup luksAddKey /dev/sdb5 /root/keyfile

[yeehi]

That worked!

I went through the instructions and rebooted; however, I had to manually enter all the encryption passwords again. The boot didn´t go straight to the login screen, either.

I think the problem is what I entered here:

LUKS devices need to create a mapper that can then be referenced in the fstab. Open /etc/crypttab

sudo nano /etc/crypttab

and add then a line like this:

sdX_crypt /dev/sdX /root/keyfile luks


I entered the following line into fstab:

sdb5_crypt /dev/sdb5 /root/keyfile luks

[bodhi.zazen]

You need an entry for /etc/crypttab as well as /etc/fstab

That entry goes in /etc/crypttab

[hyper_ch]

Is my howto so unclear?

[yeehi]

Thanks for your great How To, hyper_ch!

I think it was aimed at people with a lot more working knowledge than I have.

At the moment, my system boots, but I still always have to enter all the passphrases.

If you could add some more lines to explain what is needed, that would be a big help for me. I have created a separate /opt partition, too.

I hope I can undo what I have done, so that I can boot normally again :oops:

er, actually, I think I had better start this again. What is the simplest way to undo my earlier efforts?