Linux System Monitoring with Prometheus and Grafana: Complete Stack Setup

Prometheus collects metrics, Grafana provides dashboards. Together the most popular monitoring stack.

Prometheus Config

global:
  scrape_interval: 15s
scrape_configs:
  - job_name: node
    static_configs:
      - targets: ["web1:9100", "db1:9100"]

Node Exporter

[Unit]
Description=Node Exporter
[Service]
ExecStart=/usr/local/bin/node_exporter
Restart=always
[Install]
WantedBy=multi-user.target

Alert Rules

groups:
  - name: server_alerts
    rules:
      - alert: HighCPU
        expr: 100 - (avg by(instance)(rate(node_cpu_seconds_total{mode="idle"}[5m])) * 100) > 80
        for: 5m
      - alert: DiskSpaceLow
        expr: (node_filesystem_avail_bytes / node_filesystem_size_bytes) * 100 < 15
        for: 10m

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