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Rootfs over encrypted lvm over raid-1 on GPT
This howto describes how to setup LVM and rootfs with cryptoLUKS-encrypted raid-1 over drive with GPT
To start read Rootfs over encrypted lvm
How to prepare the hard disk for GPT read Funtoo Linux Installation on GPT_Partitions.
For example, installing a new system on /dev/sdb
root # gdisk -l /dev/sdb GPT fdisk (gdisk) version 0.6.13 Partition table scan: MBR: protective BSD: not present APM: not present GPT: present Found valid GPT with protective MBR; using GPT. Disk /dev/sdb: 625142448 sectors, 298.1 GiB Logical sector size: 512 bytes Disk identifier (GUID): 67AC0F92-E033-4B53-B6C5-D99DD8F49D90 Partition table holds up to 128 entries First usable sector is 34, last usable sector is 625142414 Partitions will be aligned on 2048-sector boundaries Total free space is 3038 sectors (1.5 MiB) Number Start (sector) End (sector) Size Code Name 1 2048 206847 100.0 MiB 0700 Linux/Windows data 2 206848 207871 512.0 KiB EF02 BIOS boot partition 3 208896 625142414 298.0 GiB FD00 Linux RAID
If you plan to use a raid-1 for installing only one partition (/dev/sdb3 in example) and, if successful, later add more to the mirror, issue something like:
root # mdadm --create /dev/md0 --level=1 --raid-devices=2 missing /dev/sdb3
If you prefer to add the two final destination devices to the array in the first place, issue something like:
root # mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sda3 /dev/sdb3
If everything worked well, the arrays will start synchronising immediately. You can monitor this progress by looking at the contents of /proc/mdstat:
root # cat /proc/mdstat Personalities : [raid1] [raid0] [raid6] [raid5] [raid4] md2 : active raid1 sdb5[1] sda5[0] 581595328 blocks [2/2] [UU] resync=DELAYED md1 : active raid1 sdb4[1] sda4[0] 41942976 blocks [2/2] [UU] [>....................] resync = 1.6% (691456/41942976) finish=8.9min speed=76828K/sec md0 : active raid1 sdb1[1] sda1[0] 511936 blocks [2/2] [UU] unused devices: <none> root #
Now, that's awesome, isn't it? :) Even more awesome is the fact that you can immediately start using your shiny new RAID. It will finish it's sync in the background while you do changes to its filesystem.
Encrypting the raid-1
root # cryptsetup -c aes-xts-plain luksFormat /dev/md0 root # cryptsetup luksOpen /dev/md0 dmcrypt_root
Initramfs setup and configuration
No initramfs
To activate the raid-1 during boot without an initramfs, perform:
echo "Activating RAID device."
if [ ! -e '/etc/mdadm.conf' ]
then
echo "DEVICE /dev/sda[0-9] /dev/sdb[0-9] /dev/md[0-9]" >> /etc/mdadm.conf
mdadm --examine --scan --config=/etc/mdadm.conf >> /etc/mdadm.conf
mdadm --assemble --scan
fi
Better-initramfs
Or use better-initramfs with raid-1 mdadm support
root # git clone git@bitbucket.org:piotrkarbowski/better-initramfs.git
This script is well documented at it's GitHub overview site (which displays the documentation from README.rst).
Grub2 configuration
Do not forget:
enc_root=/dev/md0
Also, in the non-RAID Funtoo Linux Installation doc, GRUB is only installed into the MBR of /dev/sda. When using RAID1 for /boot, you most probably want to be able to boot your system from the second device in this array, if the first one dies. To be able to do so, a bootloader must be present in the MBR of each array member disk. Because of this, apply the command shown in the main doc to install GRUB to the MBR for each of your array member disks, instead of only the first one. If, for example, you are building a RAID from /dev/sda1 and /dev/sdb1 to contain /boot, you will have to issue the following:
(chroot) # grub-install --no-floppy /dev/sda (chroot) # grub-install --no-floppy /dev/sdb (chroot) # boot-update