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Add prepare volumes and install Arch chapters

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Sandro Keil
2018-07-23 23:03:08 +02:00
parent 6e3f45dac7
commit 1982046b99
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book/arch/04-prepare-volumes.md
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# Prepare Volumes
TBD
Please take a look at the Arch Wiki page [Preparing the logical volumes](https://wiki.archlinux.org/index.php/Dm-crypt/Encrypting_an_entire_system#Preparing_the_logical_volumes "preparing the logical volumes")
to create `/` and `/home` directory/partitions. In short you do this (without swap).
> The filesystem *ext4* is used.
```
pvcreate /dev/mapper/cryptlvm
vgcreate MyVolGroup /dev/mapper/cryptlvm
lvcreate -L 30G MyVolGroup -n root
lvcreate -l 100%FREE MyVolGroup -n home
mkfs.ext4 /dev/MyVolGroup/root
mkfs.ext4 /dev/MyVolGroup/home
mount /dev/MyVolGroup/root /mnt
mkdir /mnt/home
mount /dev/MyVolGroup/home /mnt/home
```
## Encrypted `/boot` partition
The last volume is `/boot` which should also be encrypted. We can not use a YubiKey here, but it is protected with a password.
The Arch Wiki page [Preparing the boot partition](https://wiki.archlinux.org/index.php/Dm-crypt/Encrypting_an_entire_system#Preparing_the_boot_partition_5 "Preparing the boot partition")
describes this in more detail. The `efi` partition will be mounted to `/boot/efi`.
> Be aware, GRUB boot loader uses US keyboad layout. Consider this for your password!
Execute the following commands and replace `[device 3rd partition]` with the 3rd partition of your device e.g. `nvme0n1p3`
and replace `[device 2nd partition]` with the 2nd partition of your device e.g. `nvme0n1p2`.
```
cryptsetup luksFormat /dev/[device 3rd partition]
cryptsetup open /dev/[device 3rd partition] cryptboot
ls /dev/mapper
mkfs.ext4 /dev/mapper/cryptboot
mkdir /mnt/boot
mount /dev/mapper/cryptboot /mnt/boot
mkdir /mnt/boot/efi
mount /dev/[device 2nd partition] /mnt/boot/efi
```
## Keyfile for initramfs
[With a keyfile embedded in the initramfs](https://wiki.archlinux.org/index.php/Dm-crypt/Device_encryption#With_a_keyfile_embedded_in_the_initramfs "With a keyfile embedded in the initramfs")
we don't have to unlock the `/boot` partition twice. The `/boot` partition will be mounted if the system starts, so updates can be performed.
Create a randomized generated key file with the following lines and add this keyfile to the 3rd LUKS partition (replace `[device 3rd partition]` with e.g. `nvme0n1p3`).
```
dd bs=512 count=4 if=/dev/urandom of=/mnt/crypto_keyfile.bin
chmod 000 /mnt/crypto_keyfile.bin
cryptsetup luksAddKey /dev/[device 3rd partition] /mnt/crypto_keyfile.bin
```