Initial import: nuc and ks4 infrastructure documentation
README with instance tables and nuc<->ks4 network flow chart; per-container install/troubleshooting docs for nuc (jellyfin server/client, transmission-bt, bare-metal reinstall) and the ks4 two-leg backup scheme (incus-copy over wireguard). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Julien Lutran
Claude Fable 5
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# transmission-bt
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BitTorrent client in an unprivileged Incus container on `nuc`, with an
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**always-on VPN**: all peer traffic exits via ks4's public IP through a
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WireGuard tunnel to the `wireguard` container on ks4. Kill switch by
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construction — `eth0` has **no default route**, so with the tunnel down
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the container simply has no path to the internet.
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- Image: `images:ubuntu/24.04`, IP: `192.168.0.7` (macvlan, static via netplan)
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- Web UI: `http://192.168.0.7:9091` — no auth
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(`rpc-authentication-required: false`); access control is the RPC
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whitelist (`192.168.0.*` only)
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- Egress: WG peer `10.8.0.21` → `193.70.35.17:51845`, `AllowedIPs 0.0.0.0/0`
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(verified: `curl ifconfig.me` from the container returns ks4's IP)
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- Downloads: `/media/downloads` (= `usb4t/media`, same dataset Jellyfin
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reads); in-progress files in `/media/.incomplete` so Jellyfin never
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scans partials
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- `transmission-daemon` is `BindsTo=wg-quick@wg0.service` and binds
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peer traffic to `10.8.0.21` — three independent layers against leaks
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(no default route, unit binding, socket binding)
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## Anti-leak design
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1. netplan gives `eth0` only: LAN `/24` (web UI + DNS via blocky) and a
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`/32` host route to the WG endpoint via the home gateway.
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2. `wg-quick` full-tunnel mode adds its fwmark policy routing +
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iptables anti-leak rule (`iptables` package required — its absence
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makes `wg-quick` fail with `iptables-restore: command not found`).
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3. LAN traffic keeps working thanks to wg-quick's
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`suppress_prefixlength 0` rule (connected routes win over the
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tunnel's default).
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## Install script
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Run as root on the Incus host. Requires the peer added on ks4 (below).
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```bash
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#!/usr/bin/env bash
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set -euxo pipefail
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CNAME="${CNAME:-transmission-bt}"
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IMAGE="${IMAGE:-images:ubuntu/24.04}"
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incus launch "$IMAGE" "$CNAME"
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sleep 8
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incus config set "$CNAME" environment.DEBIAN_FRONTEND=noninteractive
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# static LAN config, NO default route (kill switch), /32 to the WG endpoint
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incus exec "$CNAME" -- bash -c 'cat > /etc/netplan/10-lxc.yaml <<EOF
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network:
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version: 2
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ethernets:
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eth0:
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addresses: [192.168.0.7/24]
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nameservers:
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addresses: [192.168.0.254]
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routes:
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- to: 193.70.35.17/32
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via: 192.168.0.1
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EOF
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chmod 600 /etc/netplan/10-lxc.yaml
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netplan apply'
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# packages need a temporary default route (removed right after)
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incus exec "$CNAME" -- ip route add default via 192.168.0.1
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incus exec "$CNAME" -- apt-get update
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incus exec "$CNAME" -- apt-get install -y --no-install-recommends \
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transmission-daemon wireguard-tools iptables curl
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incus exec "$CNAME" -- ip route del default via 192.168.0.1
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# WireGuard full tunnel (generate key, print pubkey for the ks4 side)
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incus exec "$CNAME" -- bash -c 'umask 077
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wg genkey > /etc/wireguard/wg0.key
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wg pubkey < /etc/wireguard/wg0.key
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cat > /etc/wireguard/wg0.conf <<EOF
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[Interface]
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Address = 10.8.0.21/24
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PrivateKey = $(cat /etc/wireguard/wg0.key)
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[Peer]
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# wireguard container on ks4 — ALL traffic routes through it
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PublicKey = TVs6d7bXTvJ0ZluTLb8wR+zIrsLvkH1944pzM+3dZXM=
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Endpoint = 193.70.35.17:51845
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AllowedIPs = 0.0.0.0/0
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PersistentKeepalive = 25
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EOF'
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incus exec "$CNAME" -- systemctl enable --now wg-quick@wg0
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# media share (same dataset as jellyfin-server)
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incus config device add "$CNAME" media disk source=/srv/media path=/media shift=true
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incus exec "$CNAME" -- mkdir -p /media/downloads /media/.incomplete
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incus exec "$CNAME" -- chown debian-transmission:debian-transmission \
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/media/downloads /media/.incomplete
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# transmission config (edit only while the daemon is stopped)
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incus exec "$CNAME" -- systemctl stop transmission-daemon
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incus exec "$CNAME" -- bash -c '
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cd /var/lib/transmission-daemon/.config/transmission-daemon
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sed -i \
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-e "s|\"download-dir\":.*|\"download-dir\": \"/media/downloads\",|" \
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-e "s|\"incomplete-dir\":.*|\"incomplete-dir\": \"/media/.incomplete\",|" \
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-e "s|\"incomplete-dir-enabled\":.*|\"incomplete-dir-enabled\": true,|" \
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-e "s|\"rpc-whitelist\":.*|\"rpc-whitelist\": \"127.0.0.1,::1,192.168.0.*\",|" \
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-e "s|\"rpc-authentication-required\":.*|\"rpc-authentication-required\": false,|" \
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-e "s|\"bind-address-ipv4\":.*|\"bind-address-ipv4\": \"10.8.0.21\",|" \
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settings.json'
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# transmission lives and dies with the tunnel
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incus exec "$CNAME" -- mkdir -p /etc/systemd/system/transmission-daemon.service.d
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incus exec "$CNAME" -- bash -c 'cat > /etc/systemd/system/transmission-daemon.service.d/vpn.conf <<EOF
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[Unit]
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BindsTo=wg-quick@wg0.service
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After=wg-quick@wg0.service
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EOF'
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incus exec "$CNAME" -- systemctl daemon-reload
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incus exec "$CNAME" -- systemctl start transmission-daemon
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incus config set "$CNAME" boot.autostart=true
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```
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On **ks4** (root), authorize the peer with the pubkey printed above:
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```sh
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incus exec wireguard -- wg set wg0 peer <PUBKEY> allowed-ips 10.8.0.21/32
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incus exec wireguard -- wg-quick save wg0
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```
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## Verification
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```sh
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incus exec transmission-bt -- wg show wg0 latest-handshakes # non-zero timestamp
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incus exec transmission-bt -- curl -s https://ifconfig.me # must print 193.70.35.17
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incus exec transmission-bt -- bash -c "ping -c1 -W2 8.8.8.8 || echo kill-switch OK" # with wg0 down
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# web UI must be tested from a LAN machine — the macvlan quirk means the
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# nuc host itself cannot reach 192.168.0.7
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```
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## Notes
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- No inbound peer port is forwarded (would need a proxy device on ks4
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+ DNAT through the tunnel); torrents work fine outbound-only, just
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connect to fewer peers.
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- Jellyfin sees finished downloads under `/media/downloads` — add it as
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a library folder or move files into the movie/show trees.
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- The image server check can make `incus launch` hang on slow WAN —
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launching from the cached image fingerprint (`incus image list`)
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bypasses it.
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