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#1 2011-06-05 01:46:40

KairiTech
Member
From: Toronto, Canada
Registered: 2011-06-04
Posts: 229

RAID system encryption with LUKS & LVM

The thing I like most about Arch is the KISS philosophy.

The Irony is that the Wikis are anything but. So I read them dutifully and finally figure out how to bring together RAID encryption/LUKS and LVM2.

There are a few things I'll like to point out however - these are just my personal choices so you should change them to your taste and feel free to comment on ways of doing them better.

I use RAID0 - not so much interested in data storage security. I want performance and trust me - I learned my lesson about backups a long time ago. I backup my backups.

I don't use SWAP - I have 8GB of RAM.

I even configure /boot as RAID1 because Arch is the only distro I have ever been able to get to install GRUB on all the disk so I can boot from any one of them - Sweet!

As you can likely tell I have three 64GB SSDs.

Boot, root and my data are spread across all three disks.

#############################################
#
# script to prepare hard disk for RAID system encryption with /arch/setup
#
# partition the first drive like so...the [archiso:2] label was applied by the install not by me
# 
#     Name           Flags          Part Type    FS Type               [Label]            Size (MB)
# -----------------------------------------------------------------------------------------------------
#     sda1                           Primary     linux_raid_m                                 24.68     
#     sda2                           Primary     linux_raid_m          [archiso:2]         63992.68
#
cfdisk    /dev/sda
#
# dump the partition table to a file
#
sfdisk -d /dev/sda > SSD-table
#
# import the table to the other drives do they'll have an identical partition scheme
#
sfdisk    /dev/sdb < SSD-table
sfdisk    /dev/sdc < SSD-table
#
# load the RAID modules just in case they aren't already loaded
#
modprobe raid0 raid1
#
# create the RAID device for /boot
#
mdadm --create /dev/md1 --level=1 --raid-devices=3 /dev/sda1 /dev/sdb1 /dev/sdc1 --metadata=0.90
#
# create the RAID device for root & data
#
mdadm --create /dev/md2 --level=0 --raid-devices=3 /dev/sda2 /dev/sdb2 /dev/sdc2
#
# load the device mapper module
#
modprobe dm_mod
#
# encrypt the device that will hold root & data
#
cryptsetup --cipher=aes-xts-plain --verify-passphrase --key-size=512 luksFormat /dev/md2
#
# open the encrypted device (pvCryptDisk)
#
cryptsetup luksOpen /dev/md2 pvCryptDisk
#
# create the physical volume
#
pvcreate /dev/mapper/pvCryptDisk
#
# create the volume group
#
vgcreate vg64SSDx3 /dev/mapper/pvCryptDisk
#
# create the logical volume for root
#
lvcreate --contiguous y --size 6G --name lvRoot vg64SSDx3 
#
# create the logical volume for data (lvMyStuff) with all the remaining space
#
lvcreate --extents +100%FREE --name lvMyStuff vg64SSDx3
#
# this is when you start /arch/setup
#
# choose the option to manually prepare hard drives using UUID
#
# when I didn't use UUID the device assignments for the drives would jump around after the reboot and the boot would fail
#
# device                           label        fs        mountpoint
# --------                         ------       --        --------------
# /dev/md1                         boot         ext2      /boot
# /dev/dmapper/vg64SSDx3-lvRoot    root         ext4      /
# /dev/dmapper/vg64SSDx3-lvMyStuff myStuff      ext4      /media/myStuff
#
# after the base packages are installed jump to VT2 with Alt-2 and copy over the RAID configuration to the install
#
# cp /mnt/etc/mdadm.conf > /mnt/etc/mdadm.conf.original
# mdadm --examine --scan > /mnt/etc/mdadm.conf
#
#############################################
#
# configure the system as indicated below (do not include the "###s")
#
# change "no" to "yes" in /etc/rc.conf
#
### USEDMRAID="yes"
### USELVM="yes"
#
# insert modules to be included in the boot image in/etc/mkinitcpio
#
### MODULES="dm_mod dm_crypt aes_x86_64 raid1 raid0"
#
# insert the hooks for the boot image in/etc/mkinitcpio
#
# I have a USB keyboard so I need usbinput
# I prefer to type the passphrase every time so I need keymaps
# the order is important so don't change it unless you know what you are doing
#
### HOOKS="base udev autodetect pata scsi sata mdadm usbinput keymap encrypt lvm2 filesystems"
#
# insert into /boot/grub/menu.lst immediately before "ro" on both kernel boot parameter lines 
#
### cryptdevice=/dev/md2:vg64SSDx3
#
#############################################

Last edited by KairiTech (2011-09-14 17:32:28)


-=[ LIVE enabled UEFI with redundant syslinux pure systemd detached LUKS header partitionless encrypted GPT SSDx3 RAID0 because I can.  ]=-

Backward compatibility is for the masses. There's no dual-boot here...

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#2 2011-07-18 17:03:48

spreadtux
Member
From: 78711
Registered: 2011-05-27
Posts: 3

Re: RAID system encryption with LUKS & LVM

Hiya,

Thx a lot. You've done a great job with your HowTo.
I unsuccessfully tried many times to achieve the same setup with 2 HDD.

But something must be missing at the end :
When Grub tries to install, it complains about "root partition autodetection failure" "Modify 'root (hd0,0)".
How did you achieve this step plz?

Regards

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#3 2011-09-14 16:13:05

KairiTech
Member
From: Toronto, Canada
Registered: 2011-06-04
Posts: 229

Re: RAID system encryption with LUKS & LVM

Sorry for the late response but I've never see this error before. It's a little strange though because you should have manually defined where root is during the install so I'm thinking there should be no need to autodetect it.


-=[ LIVE enabled UEFI with redundant syslinux pure systemd detached LUKS header partitionless encrypted GPT SSDx3 RAID0 because I can.  ]=-

Backward compatibility is for the masses. There's no dual-boot here...

Offline

#4 2011-09-14 17:31:32

KairiTech
Member
From: Toronto, Canada
Registered: 2011-06-04
Posts: 229

Re: RAID system encryption with LUKS & LVM

See my post about wanting to move all of this to GPT, GRUB2 and UEFI but not knowing how.


-=[ LIVE enabled UEFI with redundant syslinux pure systemd detached LUKS header partitionless encrypted GPT SSDx3 RAID0 because I can.  ]=-

Backward compatibility is for the masses. There's no dual-boot here...

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#5 2011-09-19 18:32:29

spreadtux
Member
From: 78711
Registered: 2011-05-27
Posts: 3

Re: RAID system encryption with LUKS & LVM

Hi Kairitech

Thx for your reply. Perhaps have I done some mistakes.
So I'll give it another try. I hope it will be successfull this time.
And I'll will have a look at your other post and your script, trying to customizing it and having it working successfully.

I'll soon give you some (good?)news so stay tuned.

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