KVM Host Guest Filesystem Images

Configuring disks for the KVM Guests Filesystem Images according to the disk layout.

Configure Raid

Configure the raid.

mdadm --create --level 1 --raid-devices 2 /dev/md2 /dev/sdc1 /dev/sdd1

Find the UUID for /dev/md2.

mdadm --detail /dev/md2
/dev/md2:
        Version : 1.2
  Creation Time : Sat Oct  7 15:57:11 2017
     Raid Level : raid1
     Array Size : 1946025984 (1855.88 GiB 1992.73 GB)
  Used Dev Size : 1946025984 (1855.88 GiB 1992.73 GB)
   Raid Devices : 2
  Total Devices : 2
    Persistence : Superblock is persistent

  Intent Bitmap : Internal

    Update Time : Sat Oct  7 23:13:13 2017
          State : clean 
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           Name : kvm02:2  (local to host kvm02)
           UUID : a78f7c84:5491a0d6:d5c5390d:8b97863f
         Events : 5069

    Number   Major   Minor   RaidDevice State
       0       8       33        0      active sync   /dev/sdc1
       1       8       49        1      active sync   /dev/sdd1

Add the array to /etc/mdadm/mdadm.conf.

ARRAY /dev/md/2  metadata=1.2 UUID=a78f7c84:5491a0d6:d5c5390d:8b97863f name=kvm02:2

Update the initrd.

update-initramfs -u

Encrypting the Raid

Format the raid with luks.

cryptsetup luksFormat /dev/md2

Open the luks device.

cryptsetup luksOpen /dev/md2 md2_crypt

Create a Key.

echo -n "uptime" | md5sum | dd of=/root/install/luks/keyfile_md2 bs=1 count=32
cryptsetup luksAddKey /dev/md2 /root/install/luks/keyfile_md2

Find the UUID for /dev/md2.

blkid
/dev/md2: UUID="d62d227d-6d94-4055-b2df-b9477293b5d6" TYPE="crypto_LUKS"

Add the key to /etc/crypttab.

md2_crypt UUID=d62d227d-6d94-4055-b2df-b9477293b5d6 /root/install/luks/keyfile_md2 luks

Update the initrd.

update-initramfs -u

Create the LVM volume.

pvcreate /dev/mapper/md2_crypt
vgcreate vg_storage /dev/mapper/md2_crypt