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README: add disk format documentation

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Jörg Thalheim 2021-05-11 18:46:11 +02:00
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README.md
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@ -90,12 +90,38 @@ $ ./deploy --force-reboot --include build02
```
## Install/Fix system from Hetzner recovery mode
1. Format and/or mount all filesystems to /mnt:
``` console
# format disk with as follow:
# - partition 1 will be the boot partition, needed for legacy (BIOS) boot
# - partition 2 is for boot partition
# - partition 3 takes up the rest of the space and is for the system
$ sgdisk -n 1:2048:4095 -n 2:4096:+512M -N 3 -t 1:ef02 -t 2:8304 -t 3:8304 /dev/nvme0n1
$ sgdisk -n 1:2048:4095 -n 2:4096:+512M -N 3 -t 1:ef02 -t 2:8304 -t 3:8304 /dev/nvme1n1
# create mdadm raid for /boot with ext4
$ sudo mdadm --create --verbose /dev/md127 --level=0 --raid-devices=2 /dev/nvme{0,1}n1p2
$ sudo mkfs.ext4 -F /dev/md127
# format zpool
$ zpool create zroot -O acltype=posixacl -O xattr=sa -O compression=lz4 mirror /dev/nvme{0,1}n1p3
$ zfs create -o mountpoint=none zroot/root
$ zfs create -o mountpoint=legacy zroot/root/nixos
$ zfs create -o mountpoint=legacy zroot/root/home
# and finally mount
$ mount -t zfs zroot/root/nixos /mnt
$ mkdir /mnt/{home,boot}
$ mount -t zfs zroot/root/home /mnt/home
$ mount -t ext4 /dev/md127 /mnt/boot
```
1. Mount all filesystems to /mnt
2. Install kexec image from Hetzner recovery system as described in [kexec.nix](roles/kexec.nix) and boot into it
3. Download infra repo
``` console
$ nix-shell -p git --run "git clone https://github.com/nix-community/infra && cd infra && nix-shell"
# Just in case generate hardware-configuration.nix and compare it with what we have in the repos
$ nixos-generate-config --root /mnt
$ diff -aur /mnt/etc/nixos/hardware-configuration.nix buildXX/hardware-configuration.nix
```
4. Build new system closure: