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