hi all,

can someone explain in detail how can I configure a usb flash for decrypting the encrypted root-fs , using it to boot from and with grub bootloader

thanks for reading

hey bro. can you rephrase that? it's not clear what you're trying to do, but it sounds like you want a live USB version of some distribution. you can get live images for a lot of the big distros - Fedora Core, Ubuntu, Gentoo - and there's instructions on their websites.

here's a list of the different kinds of USB Linux from Wikipedia:

http://en.wikipedia.org/wiki/Live_USB#Examples

let me know if this isn't what you're trying to do.

If you want an encrypted root partition, then /boot must be on a separate partition. That is all. You do not need a usb drive for this.

or ...follow lepht's response

Hi,

it seems unclear explanation of me

so it will be clear so easy! no problem at all
I'm newbie to linux, I want to create a bootable USBflash and aware of encryption key that I have created for root file system and so it needs a bootstrap program ( I need to use grub bootloader), and initrd and kernel image,
but my main problem is how can I do it! and so confused on how can I write correct info into grub.conf, please don't shame on me , I searched alot of web pages but I don't catch appropriate desired one,
I have fc10 with IBM architecture, and grub has menulist of three os: xp, vista and linux

if you can, help me in detailed way
in advance I thank to you
a_minor

i'm still not getting exactly what you're trying to do there... you've got a Linux install already, and it's encrypted, and you want a bootable USB drive that can access these encrypted partitions? is that right?

I think that what he wants is for /boot to be on the flash drive instead of the hard disk.

This way the entire hard drive can be encrypted. Kinda like this perhaps.

as win32sux said, I just need for flash USB be bootable and just do the boot process and other operation is for hard disk,
and I also read that pointed article but instead of yaboot bootloader I want to use grub with IBM pc
please give me opinion,
thanks in advance

Hi my friends,

I was so glad that finally someone has come here,

please come back to me again and guide me in this problem,
I don't know exactly what I want to do is correct and accessible or not, please give me your opinion about:
if I want to have a bootable flash USB to just doing boot process that it contains: vmlinuz, initrd.gz ( for ecrypted root filesystem in must be aware of encryption) and bootstrap program

is it right? if it's right that's funny that I create a boot-flaged partition on my flash disk and cintain if with these poinred files , and configured BIoS setting for booting from flash USB,
but it don't work !!

I don't know what must I do, If this files must be in special structure or with special content(for example about grub.conf file) please tell me how, and if anybody need that I show him/her special file that is neccessary , I'm all ear to listen to it
thanks in advance

If the error you got was from the BIOS (and not from Grub) then I would say there's two possibilities: 1) Your USB flash drive isn't bootable, or 2) Grub hasn't been properly installed. If you google for grub usb flash there's tons of search results which might be useful to you.