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thermal: van-thermal daemon (CPU+NVMe monitor, alert, log)

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Single sysfs sample loop drives three jobs off one daemon (modeled on
van-failover):

- live state at /run/van-thermal/state.json; new Cockpit "Temperatures"
  card reads it in the existing 5s loop (no per-refresh `sensors` shell-out)
- journal alerts on ok<->warn<->crit crossings, with clear_margin hysteresis
- throttled, self-rotating CSV history at /var/log/van-thermal.csv

Sensors resolved by hwmon name+label (coretemp/Package id 0, nvme/Composite),
never by hwmonN index (not stable across boots). Defaults: CPU warn 80 /
crit 95, NVMe warn 65 / crit 70. deploy.sh installs + enables the service.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Andreas Wrede
2026-06-28 21:32:13 -04:00
co-authored by Claude Opus 4.8
parent 35466f0141
commit ef6c1ce182
8 changed files with 289 additions and 3 deletions
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deploy.sh
+8 -1
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@@ -33,6 +33,11 @@ echo "== cockpit plugin =="
install -d /usr/share/cockpit/vanrouter
install -m0644 cockpit/vanrouter/* /usr/share/cockpit/vanrouter/
echo "== thermal monitor =="
install -D -m0755 power/van-thermal /usr/local/sbin/van-thermal
install -D -m0644 power/thermal-config.json /etc/van-thermal/config.json
install -D -m0644 power/van-thermal.service /etc/systemd/system/van-thermal.service
echo "== power / never-sleep =="
install -D -m0644 power/10-vanlink-nolid.conf /etc/systemd/logind.conf.d/10-vanlink-nolid.conf
# Belt-and-suspenders: a router must never suspend from idle, GUI, or a stray `systemctl suspend`.
@@ -48,7 +53,8 @@ systemctl mask systemd-networkd-wait-online.service >/dev/null 2>&1 || true
# pick up the lid drop-in (re-execs logind; does NOT drop the network)
systemctl restart systemd-logind >/dev/null 2>&1 || true
systemctl unmask hostapd >/dev/null 2>&1 || true
systemctl enable regdomain.service hostapd van-ap-dnsmasq nftables systemd-networkd van-failover >/dev/null 2>&1 || true
systemctl enable regdomain.service hostapd van-ap-dnsmasq nftables systemd-networkd van-failover van-thermal >/dev/null 2>&1 || true
systemctl restart van-thermal
# restart in dependency order; AP iface IP first, then hostapd/dnsmasq, then NAT/failover
systemctl restart systemd-networkd
systemctl restart hostapd van-ap-dnsmasq nftables van-failover
@@ -58,4 +64,5 @@ echo
echo "Deployed. Verify:"
echo " iw dev wlxc83a35a4ee55 info | grep -E 'ssid|channel|width'"
echo " cat /run/van-failover/state.json"
echo " cat /run/van-thermal/state.json # CPU + NVMe temps"
echo "Manual one-time steps (see README §4): zerotier-systemd-manager binary + 'zerotier-cli set <nwid> allowDNS=1'."