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59 lines
2.8 KiB
Plaintext
59 lines
2.8 KiB
Plaintext
---
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title: "Monitoring"
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section: "infra"
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tags: "infra"
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parent: "/infra/"
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description: "Prometheus and Grafana monitoring stack for hosts, containers, and hardware metrics."
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layout: base.njk
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---
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<h1>Monitoring</h1>
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<div class="detail-content">
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<p>Prometheus and Grafana form the central monitoring stack for the whole
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homelab, running as Docker containers on the NAS. Every machine in the
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flat — Proxmox host, Docker VM, Synology NAS, and Raspberry Pi devices —
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feeds metrics into this central instance.</p>
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<h2>What's monitored</h2>
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<ul>
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<li><strong>Proxmox host metrics</strong> — a PVE exporter reports node-level and per-VM/LXC CPU, memory, and disk metrics into a dedicated Grafana dashboard.</li>
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<li><strong>Host metrics everywhere</strong> — a node exporter runs on the NAS, the Docker host, and every Raspberry Pi, feeding basic CPU/RAM/disk/network stats.</li>
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<li><strong>Container metrics</strong> — cAdvisor runs on both the Docker host and the NAS, breaking down resource usage per container.</li>
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<li><strong>Network hardware via SNMP</strong> — an SNMP exporter polls a network-attached printer for toner level, page count, and status, proving the same pattern works for any SNMP-capable device.</li>
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</ul>
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<h2>Dashboards</h2>
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<table>
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<tr><th>Dashboard</th><th>Focus</th></tr>
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<tr><td>Proxmox monitoring (extended)</td><td>Node-level and per-guest VM/LXC metrics</td></tr>
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<tr><td>Docker container monitoring</td><td>Per-container CPU/memory/network/disk</td></tr>
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<tr><td>Network printer</td><td>Toner level, page count, online/offline status via SNMP</td></tr>
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</table>
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<h2>How it's deployed</h2>
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<p>Prometheus runs as a Docker container on the Synology NAS with a
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bind-mounted data directory for persistence. Grafana is deployed as a
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sibling container, connected to Prometheus as its primary datasource.
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Both containers are defined in a single Docker Compose file and managed
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via Portainer. The Prometheus configuration file defines scrape targets,
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scrape intervals (15 seconds for hosts, 60 seconds for network devices),
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and retention policies.</p>
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<h2>Alerting</h2>
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<p>Basic alerting is configured through Prometheus Alertmanager, which
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sends notifications to a dedicated Telegram channel for critical events
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like host-down or disk-full conditions. The dead-man's-switch pattern
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ensures that if Prometheus itself stops scraping, an alert fires within
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minutes. More sophisticated alerting rules (disk space prediction,
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temperature thresholds) are planned but not yet implemented.</p>
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<h2>Open items</h2>
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<ul>
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<li>Alerting rules are not yet configured for most services.</li>
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<li>The secondary (test) Proxmox host isn't monitored yet — it's usually powered off.</li>
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<li>Retention policy for Prometheus data hasn't been tuned.</li>
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<li>Monitoring data itself isn't currently backed up.</li>
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</ul>
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</div>
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