Diff: CyberLeo/BootstrapGentoo

Differences between version 8 and previous revision of CyberLeo/BootstrapGentoo.

Other diffs: Previous Major Revision, Previous Author

version 8

OCz Vertex 2 probably has an eraseblock size of 512kiB, so 1MB alignment works Same with Kingston SSDNow V-series

Pregap only needs 32 sectors; boot only needs about 16MB Make sure LUKS partition is aligned to 2048 sectors (1MB) on both sides! Leave about 40MB at the end. Might as well

Here's a layout for MBR:

p      start        end       size  type
----------------------------------------
p          0         31         32  0x00 # Pregap
1         32      34815      34784  0x83 # Boot
2      34816  107380735  107345920  0x44 # LUKS
3  107380736  107463887      83152  0x00 # SSD-padding

Here's a layout for GPT: Note the presence of EFIboot (32MB FAT32 /boot filesystem) and BIOSboot (where the GRUB2 stage1.5 code). Once again, make sure the LUKS partition is aligned to 2048 sectors (1MB) on both sides!

Ended up using Windows 7 installer to create the necessary GPT stuff; apparently the boot settings manager in the system configuration rom does not set it up correctly.

----start  ------end  -----size  -----type  ----name
        0          0          1       pmbr      ----
        1         33         33        GPT      ----
       34      67583      67550        efi   EFIboot
    67584  107462655  107395072       LUKS      LUKS
107462656  107463854       1199       boot  BIOSboot
107463855  107463887         33        GPT      ----

# Create the encrypted store
# aes-xts-plain and aes-cbc-essiv:sha256 are equivalent, since they both mask the watermarking attacks present in aes-cbc-plain; aes-xts-essiv:sha256 is unnecessary.
cryptsetup luksFormat -v -s 256 -c aes-cbc-essiv:sha256 -h sha1 --align-payload 2048 /dev/sda2
cryptsetup luksOpen /dev/sda2 mapajani

# Obfuscate all empty space on the backing store
badblocks -b1024 -c1024 -vvwt 0x00 /dev/mapper/mapajani # Or random or whatever; just need to write every sector of the raw dev

# Carve up the encrypted store using LVM
lvm pvcreate --verbose --metadatasize 1000k /dev/mapper/mapajani
lvm pvs -oname,vg_mda_size,pe_start --units s # Make sure 'pe_start' is a multiple of 2048 (1MB)
lvm vgcreate --verbose mapajani /dev/mapper/mapajani
lvm pvs -oname,vg_mda_size,pe_start --units s # Output changes; make sure 'pe_start' is a multiple of 2048 (1MB)
lvm lvcreate --verbose --extents 12079 --name root mapajani
lvm lvcreate --verbose --extents 1024 --name swap mapajani

# If using MBR:
mke2fs -vvt ext2 -L mapajani-boot /dev/sda1
# If using GPT:
mkdosfs -vvF32 -n mapajani-boot /dev/sda1

# Make root and swap:
mke2fs -vvt ext4 -E lazy_itable_init=1 -L mapajani-root /dev/mapper/mapajani-root
mkswap -f -L mapajani-swap /dev/mapper/mapajani-swap

When reconstituting an existing image, do something like this:

mkdir -p /media/dst
mount -t ext4 -orelatime /dev/mapper/mapajani-root /media/dst
# Copy critical stuff first
( cd /media/src/root; rsync --archive --hard-links --progress --sparse --stats --verbose +boot bin boot etc lib lib32 lib64 sbin /media/dst/ )
# Copy core stuff next
( cd /media/src/root; rsync --archive --hard-links --progress --sparse --stats --verbose dev root usr var /media/dst/ )
# Copy all the rest
( cd /media/src/root; rsync --archive --hard-links --progress --sparse --stats --verbose ./ /media/dst/ )

# Mount stuff to prepare for chroot
# For MBR:
mount -t ext2 -orelatime /dev/sda1 /media/dst/boot
# For GPT:
mount -t vfat -orelatime /dev/sda1 /media/dst/boot
# Prepare for chroot
mount -t devtmpfs devtmpfs /media/dst/dev
mount -t devpts devpts /media/dst/dev/pts
mount -t proc procfs /media/dst/proc
mount -t sysfs sysfs /media/dst/sysfs

# Chroot:
chroot /media/dst bash

# Install boot
rsync --archive --hard-links --progress --sparse --stats --verbose /+boot/ /boot/

# Install grub
grub-install /dev/sda

Make sure to update grub boot to include the new LUKS UUID so it can be autoloaded by initrd