modules/nixos/default.nix

@@ -33,4 +33,5 @@
   virtualisation = import ./virtualisation;
   webPage = import ./webPage;
   windows-oci = import ./windows-oci;
+  zfs = import ./zfs;
 }

modules/nixos/zfs/default.nix

@@ -0,0 +1,55 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}:
+
+# Set `networking.hostId` to:
+# $ head -c 8 /etc/machine-id
+
+# Mark datasets to snapshot:
+# $ sudo zfs set com.sun:auto-snapshot:daily=true dpool/data/backup
+
+# Generate SSH key for replication (empty passphrase):
+# $ sudo -i ssh-keygen -t rsa -b 4096 -f /root/.ssh/zfs-replication
+
+let
+  cfg = config.services.zfs;
+
+  inherit (lib) mkDefault mkForce;
+in
+{
+  boot.supportedFilesystems = [ "zfs" ];
+  boot.loader.systemd-boot.enable = mkForce false;
+  boot.loader.grub.enable = mkForce true;
+  boot.loader.grub.zfsSupport = mkForce true;
+
+  services.zfs.trim = {
+    enable = mkDefault true;
+    interval = mkDefault "weekly";
+  };
+
+  services.zfs.scrub = {
+    enable = mkDefault true;
+    interval = mkDefault "monthly";
+  };
+
+  services.zfs.autoSnapshot = {
+    enable = mkDefault true;
+    flags = mkDefault "-k -p --utc";
+    frequent = mkDefault 0;
+    hourly = mkDefault 24;
+    daily = mkDefault 7;
+    weekly = mkDefault 4;
+    monthly = mkDefault 0;
+  };
+
+  services.zfs.autoReplication = {
+    username = mkDefault "root";
+    identityFilePath = mkDefault "/root/.ssh/zfs-replication";
+    followDelete = mkDefault true;
+  };
+
+  environment.systemPackages = with pkgs; [ lz4 ];
+}

modules/nixos/zfs/disks.sh

@@ -0,0 +1,151 @@
+#!/usr/bin/env bash
+declare -a SSDs=(
+  # '/dev/disk/by-id/abc123'
+)
+
+declare -a HDDs=(
+  # '/dev/disk/by-id/def456'
+)
+
+declare -a DATA_DATASETS=(
+  # 'dataset'
+)
+
+MNT='/mnt'
+SWAP_GB=32
+
+# Helper function to wait for devices
+wait_for_device() {
+  local device=$1
+  echo "Waiting for device: $device ..."
+  while [[ ! -e $device ]]; do
+    sleep 1
+  done
+  echo "Device $device is ready."
+}
+
+# Function to install a package if it's not already installed
+install_if_missing() {
+  local cmd="$1"
+  local package="$2"
+  if ! command -v "$cmd" &> /dev/null; then
+    echo "$cmd not found, installing $package..."
+    nix-env -iA "nixos.$package"
+  fi
+}
+
+install_if_missing "sgdisk" "gptfdisk"
+install_if_missing "partprobe" "parted"
+
+# Ensure swap parts are off
+swapoff --all
+udevadm settle
+
+### SSDs ###
+echo "Setting up SSDs..."
+
+# Wait for SSD devices to be ready
+for ssd in "${SSDs[@]}"; do
+  wait_for_device "$ssd"
+done
+
+# Wipe and partition SSDs
+for i in "${!SSDs[@]}"; do
+  ssd="${SSDs[$i]}"
+  ssd_num=$((i + 1))
+  
+  echo "Processing SSD $ssd_num: $ssd"
+  
+  # Wipe filesystems
+  wipefs -a "$ssd"
+  
+  # Clear part tables
+  sgdisk --zap-all "$ssd"
+  
+  # Partition disk
+  sgdisk -n1:1M:+1G         -t1:EF00 -c1:BOOT$ssd_num "$ssd"
+  sgdisk -n2:0:+"$SWAP_GB"G -t2:8200 -c2:SWAP$ssd_num "$ssd"
+  sgdisk -n3:0:0            -t3:BF00 -c3:ROOT$ssd_num "$ssd"
+  
+  partprobe -s "$ssd"
+  udevadm settle
+  wait_for_device "${ssd}-part3"
+done
+
+# Create root pool
+echo "Creating root pool..."
+zpool create -f -o ashift=12 -o autotrim=on -R "$MNT" -O acltype=posixacl -O canmount=off -O dnodesize=auto -O normalization=formD -O relatime=on -O xattr=sa -O mountpoint=none rpool mirror "${SSDs[0]}"-part3 "${SSDs[1]}"-part3
+
+# Create and mount root system container
+zfs create -o canmount=noauto -o mountpoint=legacy rpool/root
+mount -o X-mount.mkdir -t zfs rpool/root "$MNT"
+
+# Create root datasets
+declare -a ROOT_DATASETS=('home' 'nix' 'tmp' 'var')
+for dataset in "${ROOT_DATASETS[@]}"; do
+  zfs create -o mountpoint=legacy "rpool/$dataset"
+  mount -o X-mount.mkdir -t zfs "rpool/$dataset" "$MNT/$dataset"
+done
+
+# Format boot and swap partitions
+for i in "${!SSDs[@]}"; do
+  ssd="${SSDs[$i]}"
+  ssd_num=$((i + 1))
+  
+  mkfs.vfat -F 32 -n BOOT$ssd_num "${ssd}"-part1
+  mkswap -L SWAP$ssd_num "${ssd}"-part2
+  swapon -L SWAP$ssd_num
+done
+
+# Mount first boot partition
+mount -t vfat -o fmask=0077,dmask=0077,iocharset=iso8859-1,X-mount.mkdir -L BOOT1 "$MNT"/boot
+
+### HDDs ###
+echo "Setting up HDDs..."
+
+# Wait for HDD devices to be ready
+for hdd in "${HDDs[@]}"; do
+  wait_for_device "$hdd"
+done
+
+# Wipe and partition HDDs
+for i in "${!HDDs[@]}"; do
+  hdd="${HDDs[$i]}"
+  hdd_num=$((i + 1))
+  
+  echo "Processing HDD $hdd_num: $hdd"
+  
+  wipefs -a "$hdd"
+  sgdisk --zap-all "$hdd"
+  sgdisk -n1:0:0 -t1:BF00 -c1:DATA$hdd_num "$hdd"
+done
+
+udevadm settle
+
+# Wait for all HDD partitions to appear
+for hdd in "${HDDs[@]}"; do
+  wait_for_device "${hdd}-part1"
+done
+
+# Create data pool
+echo "Creating data pool..."
+mkdir -p "$MNT"/data
+
+hdd_partitions=()
+for hdd in "${HDDs[@]}"; do
+  hdd_partitions+=("${hdd}-part1")
+done
+
+zpool create -f -o ashift=12 -o autotrim=on -R "$MNT" -O acltype=posixacl -O xattr=sa -O dnodesize=auto -O compression=lz4 -O normalization=formD -O relatime=on -O mountpoint=none dpool raidz "${hdd_partitions[@]}"
+
+# Create and mount data root container
+zfs create -o canmount=noauto -o mountpoint=legacy dpool/data
+mount -o X-mount.mkdir -t zfs dpool/data "$MNT"/data
+
+# Create and mount data datasets
+for dataset in "${DATA_DATASETS[@]}"; do
+  zfs create -o mountpoint=legacy "dpool/data/$dataset"
+  mount -o X-mount.mkdir -t zfs "dpool/data/$dataset" "$MNT/data/$dataset"
+done
+
+echo "Setup complete."