uefi boot btrfs root config for dummies

This arch linux guide used for config reference

https://www.nishantnadkarni.tech/posts/arch_installation/

1) Parted

uefi
16GB swap
btrfs rootfs

parted -a optimal /dev/sda

mklabel gpt
mkpart esp fat32 0% 513
mkpart swap linux-swap 513 16896
mkpart rootfs btrfs 16896 100%
set 1 boot on

2) create filesystems

mkfs.fat -F32 /dev/sda1
mkswap /dev/sda2
mkfs.btrfs /dev/sda3

3) btrfs subvolumes

mount /dev/sda3 /mnt/gentoo

btrfs su cr /mnt/gentoo/@
btrfs su cr /mnt/gentoo/@home
btrfs su cr /mnt/gentoo/@.snapshots

umount /mnt/gentoo

mount -o subvol=@ /dev/sda3 /mnt/gentoo

# You need to manually create folder to mount the other subvolumes at
mkdir /mnt/gentoo/{efi,home,.snapshots}

mount -o commit=120,compress=zstd,space_cache,subvol=@home /dev/sda3 /mnt/gentoo/home
mount -o commit=120,compress=zstd,space_cache,[email protected] /dev/sda3 /mnt/gentoo/.snapshots
mount /dev/sda1 /mnt/gentoo/efi

resume normal gentoo install

fstab config

adjust to match the results of blkid command

UUID=847df035-e726-45e9-9cff-fb46aa97ae6e       /               btrfs           defaults,compress=zstd,subvolid=256,subvol=@           0 0
UUID=847df035-e726-45e9-9cff-fb46aa97ae6e       /home           btrfs           defaults,compress=zstd,subvolid=257,subvol=@home       0 0
UUID=847df035-e726-45e9-9cff-fb46aa97ae6e       /.snapshots     btrfs           defaults,compress=zstd,subvolid=258,[email protected] 0 0
UUID=e30fbe93-d09e-4ea9-a1c7-d18d5c5c95fb       none            swap            sw              0 0
UUID=7F8B-5EF0                                  /efi            vfat            noauto,defaults 0 2