Frank
dab81b91a3
prometheus, grafana, loki, alloy and node-exporter ran only from dankclaw/compose.yaml. Rootless podman does not restart bare containers, so they did not survive the 2026-09-11 reboot for the amd_iommu=off change and had to be restored by hand — the same gap that had already cost the fleet Caddy and Pi-hole, which is why the boot-persistence rule exists. Each is now a rootless Quadlet unit under dankclaw/observability/quadlet/, installed and dispatched by deploy_observability in deploy-remote.sh, with the compose definitions retired so only one owner exists per container name. Images, mounts, arguments and container names are unchanged, so Caddy's proxies and Prometheus' own scrape config keep resolving. Two posture changes, both about the unauthenticated surface: * The three HTTP UIs published on 0.0.0.0 with no authentication of any kind (Prometheus even with the lifecycle endpoint enabled). They now publish on 127.0.0.1: the browser path is the guarded franksdank.cloud vhost, Caddy reaches them by name over dankclaw_default, and the host-side homepage status timer probes loopback. Nothing legitimately used the LAN port. * node-exporter bound :9100 on every interface; it now binds exactly its two consumers, loopback (homepage timer) and the LAN address (Prometheus, which runs in a container and cannot reach the host's loopback). alloy gains a reachable health endpoint: its UI listens on the container's own loopback and alloy 1.x refuses a config block for it, so the compose service had nothing to probe — the homepage status card for alloy read 'down' continuously. The unit moves the UI with a command-line flag and publishes 127.0.0.1:12345. grafana keeps its Authentik OAuth client secret without receiving the whole .env: systemd expands the value from a [Service] EnvironmentFile, which never reaches the container.
53 lines
2.1 KiB
INI
53 lines
2.1 KiB
INI
# Quadlet unit: node-exporter (rootless, boot-persistent).
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#
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# Install path on dankclaw: ~/.config/containers/systemd/node-exporter.container
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# Unit name: node-exporter.service (container name: node-exporter)
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#
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# Host metrics source for Prometheus. This replaces the compose service of the
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# same name in dankclaw/compose.yaml ("Observability" block).
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#
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# HOST NAMESPACE. It must run in the host network namespace to report the
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# host's own interfaces/connections, and --pid=host for the processes and
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# cgroups collectors. "localhost" inside the container is therefore the host's
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# loopback, which is what the homepage status timer probes.
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#
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# LISTEN ADDRESSES. Until 2026-09-11 this bound :9100 on every interface. It
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# now binds exactly two: loopback for the homepage status probe, and the LAN
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# address because Prometheus — which runs in a container on dankclaw_default —
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# scrapes http://192.168.0.143:9100 (shared/prometheus/prometheus.yml,
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# job "node-dankclaw"). node_exporter itself has no authentication, so keeping
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# the wildcard bind off the table matters: this is the second half of the
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# pairing that removes the unauthenticated observability surface, and both
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# consumers are accounted for. Dankserver runs its own copy of this container
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# (scraped by the "node-dankserver" job) from its own compose stack.
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#
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# MOUNTS. The container reads the host's /proc, /sys and / as /host/* read-only
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# and is pointed at them with --path.*; it writes nothing anywhere.
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[Unit]
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Description=Prometheus node exporter (Dankclaw host metrics)
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After=network-online.target
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Wants=network-online.target
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[Container]
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ContainerName=node-exporter
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Image=docker.io/prom/node-exporter:latest
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Network=host
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PodmanArgs=--pid=host
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Exec=--path.procfs=/host/proc --path.sysfs=/host/sys --path.rootfs=/rootfs --web.listen-address=127.0.0.1:9100 --web.listen-address=192.168.0.143:9100
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Volume=/proc:/host/proc:ro
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Volume=/sys:/host/sys:ro
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Volume=/:/rootfs:ro
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HealthCmd=wget --spider -q http://localhost:9100/metrics
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HealthInterval=30s
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HealthTimeout=10s
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HealthRetries=3
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HealthStartPeriod=30s
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[Service]
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Restart=always
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RestartSec=10
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[Install]
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WantedBy=default.target
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