2.1 KiB
PROMETHEUS CHEAT SHEET
Last Updated: 2026-05-11 14:44:00
Architecture Quick Reference
Central server runs:
- Prometheus → port 9090
- Grafana → port 3000
- Alertmanager → port 9093
Each remote server runs:
- Node Exporter → port 9100
Bridge Reference
| Prometheus concept | MERN/Express equivalent |
|---|---|
| prometheus.yml | Express config / .env |
| scrape_interval | setInterval() |
| Node Exporter | /health endpoint |
| job_name | route group name |
| labels | MongoDB document fields |
| PromQL | MongoDB query language |
| rate() | calculating speed from counter |
| Grafana | React frontend |
| Alertmanager | nodemailer |
| systemd service | PM2 process |
| promtool check | ESLint |
| recording rule | database view |
| federation | API gateway pattern |
Essential Commands
Install sequence
wget → Downloads file from internet tar -xvf → Unzips a .tar.gz file sudo useradd --no-create-home --shell /bin/false prometheus → Creates restricted user sudo mkdir <folder_path> → Creates a new folder as admin sudo chown user:group <folder_path> → Changes the owner of a folder sudo cp → Copies a file to a new location
systemd commands
sudo systemctl daemon-reload → Reloads Linux after creating a new .service file sudo systemctl start → Turns a service ON right now sudo systemctl enable → Tells Linux to turn it on automatically after reboot sudo systemctl status → Checks if the service is running or crashed
Validation
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Debugging
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prometheus.yml Skeleton
global:
scrape_interval: 15s
scrape_configs:
- job_name: "example_job"
static_configs:
- targets: ["IP:PORT"]
alertmanager.yml Skeleton
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Alert Rule Skeleton
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Node Exporter systemd service
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PromQL Quick Reference
My 7 servers queries
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Aggregation
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Alert Rules For 7 Servers
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Troubleshooting Decision Tree
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Common Errors and Fixes
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