encrypted BTRFS multi-disk system

To set up an encrypted BTRFS multi-disk system in Alpine Linux, follow these steps:

Preparation

1. Install necessary packages:

apk add btrfs-progs cryptsetup blkid

Encryption Setup

1. Encrypt each disk partition you want to use:

cryptsetup luksFormat /dev/nvme0n1p2 cryptsetup luksFormat /dev/nvme0n1p3

2. Open the encrypted partitions:

cryptsetup open /dev/nvme0n1p2 crypt1 cryptsetup open /dev/nvme0n1p3 crypt2

BTRFS Configuration

1. Create a BTRFS filesystem across the encrypted partitions:

mkfs.btrfs -m raid1 -d raid1 /dev/mapper/crypt1 /dev/mapper/crypt2

2. Mount the BTRFS filesystem:

mount /dev/mapper/crypt1 /mnt

3. Create subvolumes:

btrfs subvolume create /mnt/root btrfs subvolume create /mnt/home

4. Unmount the filesystem:

umount /mnt

5. Mount the root subvolume:

mount -o subvol=root /dev/mapper/crypt1 /mnt

System Configuration

1. Edit /etc/crypttab to include both encrypted partitions

2. Modify /etc/fstab to mount the BTRFS subvolumes

3. Update /etc/mkinitfs/mkinitfs.conf to include necessary features:

features="ata base cdrom btrfs keymap kms mmc nvme raid scsi usb cryptsetup cryptkey resume"

4. Create a kernel hook to ensure proper boot setup