# Quadlet unit: node-exporter (rootless, boot-persistent) — RENDERED ARTIFACT.
# Regenerate: python3 scripts/service-map.py render node-exporter-unit --host dankserver
# Source: shared/services.yml (entry node-exporter) + this template.
#
# Install path on dankserver: ~/.config/containers/systemd/node-exporter.container
# Unit name: node-exporter.service (container name: node-exporter)
#
# Host metrics source for Prometheus. Replaces the compose service of the same
# name (the "Observability" block): Dankclaw moved to this quadlet on
# 2026-09-11, Dankserver on 2026-09-16 — its compose-only copy died at a reboot
# and stayed dead (rootless Podman does not restart bare containers after the
# explicit stop shutdown performs), dead for a day and a half before anyone
# noticed. One owner per container name; no compose file remains anywhere.
#
# HOST NAMESPACE. It must run in the host network namespace to report the
# host's own interfaces/connections, and --pid=host for the processes and
# cgroups collectors. "localhost" inside the container is therefore the host's
# loopback, which is what the homepage status timer probes.
#
# LISTEN ADDRESSES. Exactly two: loopback for the homepage status probe, and
# the LAN address, because Prometheus — which runs in a container on
# dankclaw_default — scrapes http://192.168.0.235:9100/metrics
# (shared/prometheus/prometheus.yml, job "node-dankserver"). node_exporter has no
# authentication, so the wildcard bind stays off the table; this is the
# pairing that removes the unauthenticated observability surface on every
# host, and both consumers are accounted for.
#
# MOUNTS. The container reads the host's /proc, /sys and / as /host/*
# read-only and is pointed at them with --path.*; it writes nothing anywhere.

[Unit]
Description=Prometheus node exporter (Dankserver host metrics)
After=network-online.target
Wants=network-online.target

[Container]
ContainerName=node-exporter
Image=docker.io/prom/node-exporter:latest
Network=host
PodmanArgs=--pid=host
Exec=--path.procfs=/host/proc --path.sysfs=/host/sys --path.rootfs=/rootfs --web.listen-address=127.0.0.1:9100 --web.listen-address=192.168.0.235:9100
Volume=/proc:/host/proc:ro
Volume=/sys:/host/sys:ro
Volume=/:/rootfs:ro
HealthCmd=wget --spider -q http://localhost:9100/metrics
HealthInterval=30s
HealthTimeout=10s
HealthRetries=3
HealthStartPeriod=30s

[Service]
Restart=always
RestartSec=10

[Install]
WantedBy=default.target