On Wed, Feb 10, 2010 at 05:23:32PM -0500, M Thomas Frederiksen wrote: > On Wed, Feb 10, 2010 at 13:08, Arno Wagner <arno@xxxxxxxxxxx> wrote: > > > > > Why would you, is /dev/mapper/sda3_not fine? > > > > It's fine at the moment. But expect it not to work as soon as I add the > other volumes to my btrfs. Remember btrfs has a built-in volume manager. > > > > > > > ? Would that be the same UUID_SUB for other /dev/mapper/sdX_crypts? > > > > I don't think so. > > > > > And > > > would grub / boot scripts be smart enough to figure out that it needs all > > > three device files? > > > > Grub is not involved. What your boot script does, I have no idea. > > > > Grub needs to know how to get the root device(s) setup. Grub just needs to find the kernel, load it and start it. That is it. The rest is done by the kernel. In particular Grub cannot set up any decryption. For that reason when using encrypted root with Grub, you will need a small partition that holds kernel, initrd and Grub files including its configuration. The actual root device is passed to the kernel as parameter, but it cannot be encrypted. What is passed with encrypted root is the initrd, which contains the initial root file system, which is a minimal but working root filesystem with some essential tools and some scripts. This initial root is then replaced by the decrypted root under control of the init system in the initrd, i.e. by some scripts in the initrd. Grubs job is done when it loaded the kernel and gave it its commandline. If you want encrypted boot, you need to use TrueCrypt or the like, which has its own boot code and does not need Grub. Arno -- Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno@xxxxxxxxxxx GnuPG: ID: 1E25338F FP: 0C30 5782 9D93 F785 E79C 0296 797F 6B50 1E25 338F ---- Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans If it's in the news, don't worry about it. The very definition of "news" is "something that hardly ever happens." -- Bruce Schneier _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx http://www.saout.de/mailman/listinfo/dm-crypt
