1. Buat User

sudo useradd --no-create-home --shell /bin/false node_exporter

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2. Download Node Exporter

cd /tmp

wget https://github.com/prometheus/node_exporter/releases/download/v1.9.1/node_exporter-1.9.1.linux-amd64.tar.gz

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3. Extract

tar xvf node_exporter-1.9.1.linux-amd64.tar.gz

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4. Copy Binary

sudo cp node_exporter-1.9.1.linux-amd64/node_exporter /usr/local/bin/

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5. Permission

sudo chown node_exporter:node_exporter /usr/local/bin/node_exporter

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6. Buat Service

sudo nano /etc/systemd/system/node_exporter.service

Isi:

[Unit]
Description=Node Exporter
Wants=network-online.target
After=network-online.target

[Service]
User=node_exporter
Group=node_exporter
Type=simple

ExecStart=/usr/local/bin/node_exporter

Restart=always

[Install]
WantedBy=multi-user.target

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7. Reload Systemd

sudo systemctl daemon-reload

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8. Enable & Start

sudo systemctl enable node_exporter

sudo systemctl start node_exporter

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9. Cek Status

systemctl status node_exporter

Harus:

active (running)

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10. Test Metrics

curl http://127.0.0.1:9100/metrics

Jika muncul metric panjang → sukses.

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11. Buka Firewall

ufw allow 9100/tcp

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12. Tambahkan ke Prometheus

Di server monitoring:

nano /etc/prometheus/prometheus.yml

Tambahkan:

  - job_name: 'node-exporter'
    static_configs:
      - targets:
          - 10.10.10.2:9100
        labels:
          hostname: 'WEB-1'

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13. Restart Prometheus

systemctl restart prometheus

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14. Verifikasi

Buka:

http://IP_PROMETHEUS:9090/targets

Harus:

UP

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15. Import Dashboard Grafana

Masuk Grafana:

Dashboards
→ Import

Dashboard ID terbaik:

Dashboard	ID
Node Exporter Full	1860
Server Monitoring	15172

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16. Yang Bisa Dipantau

✅ CPU
✅ RAM
✅ Disk
✅ Network
✅ Load VPS
✅ Uptime
✅ I/O
✅ Temperature

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17. Alert Penting

CPU Tinggi

100 - (avg by(instance)(rate(node_cpu_seconds_total{mode="idle"}[1m])) * 100)

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RAM Tinggi

100 - ((node_memory_MemAvailable_bytes / node_memory_MemTotal_bytes) * 100)

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Disk Penuh

100 - ((node_filesystem_avail_bytes{mountpoint="/"} * 100) / node_filesystem_size_bytes{mountpoint="/"})