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ZFS Detection and Sanoid Installation
======================================
When archsetup runs, it should detect if the system is on ZFS and install sanoid.
Detection:
- Check if root filesystem is ZFS: `findmnt -n -o FSTYPE /` returns "zfs"
- Or check if zpool exists: `zpool list -H 2>/dev/null`
If ZFS detected:
1. Install sanoid from AUR: `yay -S sanoid`
2. Create /etc/sanoid/sanoid.conf (see below)
3. Enable the timer: `systemctl enable --now sanoid.timer`
4. Create the syncoid replication script and systemd units (see below)
Context:
- install-archzfs can't install sanoid (AUR package)
- archsetup already has AUR helper setup, so it's the right place to install it
- syncoid (for TrueNAS replication) comes with the sanoid package
Added: 2026-01-17
================================================================================
SANOID CONFIGURATION (/etc/sanoid/sanoid.conf)
================================================================================
# Sanoid configuration for ZFS snapshots
# Less aggressive - TrueNAS handles long-term backups
#############################
# Templates
#############################
[template_production]
# Local rollback capability
hourly = 6
daily = 7
weekly = 2
monthly = 1
autosnap = yes
autoprune = yes
[template_backup]
# Less frequent for large/static data
hourly = 0
daily = 3
weekly = 2
monthly = 1
autosnap = yes
autoprune = yes
[template_none]
autosnap = no
autoprune = yes
#############################
# Datasets
#############################
[zroot/ROOT/default]
use_template = production
[zroot/home]
use_template = production
recursive = yes
[zroot/media]
use_template = backup
[zroot/vms]
use_template = backup
[zroot/var/log]
use_template = production
[zroot/var/lib/pacman]
use_template = production
[zroot/var/cache]
use_template = none
[zroot/var/tmp]
use_template = none
[zroot/tmp]
use_template = none
================================================================================
SYNCOID REPLICATION SCRIPT (/usr/local/bin/zfs-replicate)
================================================================================
#!/bin/bash
# zfs-replicate - Replicate ZFS datasets to TrueNAS
#
# Usage:
# zfs-replicate # Replicate all configured datasets
# zfs-replicate [dataset] # Replicate specific dataset
set -e
# TrueNAS Configuration
# Try local network first, fall back to tailscale
TRUENAS_LOCAL="truenas.local"
TRUENAS_TAILSCALE="truenas"
TRUENAS_USER="root"
TRUENAS_POOL="vault"
BACKUP_PATH="backups" # TODO: Configure actual path
# Datasets to replicate
DATASETS="zroot/ROOT/default zroot/home zroot/media zroot/vms"
# Colors
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
RED='\033[0;31m'
NC='\033[0m'
info() { echo -e "${GREEN}[INFO]${NC} $1"; }
warn() { echo -e "${YELLOW}[WARN]${NC} $1"; }
error() { echo -e "${RED}[ERROR]${NC} $1"; exit 1; }
command -v syncoid >/dev/null 2>&1 || error "syncoid not found. Install sanoid package."
# Determine which host to use
determine_host() {
if ping -c 1 -W 2 "$TRUENAS_LOCAL" &>/dev/null; then
echo "$TRUENAS_LOCAL"
elif ping -c 1 -W 2 "$TRUENAS_TAILSCALE" &>/dev/null; then
echo "$TRUENAS_TAILSCALE"
else
error "Cannot reach TrueNAS at $TRUENAS_LOCAL or $TRUENAS_TAILSCALE"
fi
}
TRUENAS_HOST=$(determine_host)
info "Using TrueNAS host: $TRUENAS_HOST"
# Single dataset mode
if [[ -n "$1" ]]; then
dataset="$1"
dest="$TRUENAS_USER@$TRUENAS_HOST:$TRUENAS_POOL/$BACKUP_PATH/${dataset#zroot/}"
info "Replicating $dataset -> $dest"
syncoid --recursive "$dataset" "$dest"
exit 0
fi
# Full replication
info "Starting ZFS replication to $TRUENAS_HOST"
echo ""
for dataset in $DATASETS; do
dest="$TRUENAS_USER@$TRUENAS_HOST:$TRUENAS_POOL/$BACKUP_PATH/${dataset#zroot/}"
info "Replicating $dataset -> $dest"
if syncoid --recursive "$dataset" "$dest"; then
info " Success"
else
warn " Failed (will retry next run)"
fi
echo ""
done
info "Replication complete."
================================================================================
SYSTEMD SERVICE (/etc/systemd/system/zfs-replicate.service)
================================================================================
[Unit]
Description=ZFS Replication to TrueNAS
After=network-online.target
Wants=network-online.target
[Service]
Type=oneshot
ExecStart=/usr/local/bin/zfs-replicate
User=root
[Install]
WantedBy=multi-user.target
================================================================================
SYSTEMD TIMER (/etc/systemd/system/zfs-replicate.timer)
================================================================================
[Unit]
Description=Run ZFS replication nightly
[Timer]
OnCalendar=*-*-* 02:00:00
RandomizedDelaySec=1800
Persistent=true
[Install]
WantedBy=timers.target
================================================================================
ENABLE REPLICATION
================================================================================
After SSH key auth is set up to TrueNAS:
systemctl enable --now zfs-replicate.timer
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