Prometheus exporter in Nginx - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a Prometheus exporter?

A Prometheus exporter is a tool that collects metrics from a system or application and exposes them in a format Prometheus can read.

beginner

Why do we need a Prometheus exporter for Nginx?

Nginx does not expose metrics in Prometheus format by default, so an exporter collects Nginx stats and converts them for Prometheus to scrape.

intermediate

Which Nginx module is commonly used to expose metrics for Prometheus?

The 'nginx-prometheus-exporter' or a sidecar exporter is commonly used to expose Nginx metrics in Prometheus format.

beginner

How does Prometheus get metrics from an exporter?

Prometheus periodically sends HTTP requests to the exporter's metrics endpoint to collect the current metrics data.

intermediate

What kind of metrics can the Nginx Prometheus exporter provide?

It can provide metrics like request counts, response statuses, connection states, and request durations.

What is the main role of a Prometheus exporter?

A To collect and expose metrics in Prometheus format

B To store metrics data permanently

C To visualize metrics in dashboards

D To send alerts based on metrics

Exporters collect metrics from applications and expose them so Prometheus can scrape them.

Which protocol does Prometheus use to scrape metrics from an exporter?

A FTP

B HTTP

C SSH

D SMTP

Prometheus scrapes metrics by sending HTTP requests to the exporter endpoint.

Why can't Prometheus directly scrape Nginx metrics without an exporter?

A Nginx metrics are encrypted

B Prometheus only works with databases

C Nginx blocks Prometheus IPs

D Nginx does not expose metrics in Prometheus format by default

Nginx needs an exporter to convert its stats into Prometheus format.

Which of these is NOT a typical metric provided by the Nginx Prometheus exporter?

A Request count

B Connection states

C CPU temperature

D Response status codes

CPU temperature is not provided by the Nginx exporter; it focuses on web server metrics.

How often does Prometheus scrape metrics from exporters by default?

A Every 15 seconds

B Every 1 second

C Every 1 hour

D Only once at startup

Prometheus usually scrapes metrics every 15 seconds by default.

Explain how a Prometheus exporter works with Nginx to provide monitoring data.

Think about how data flows from Nginx to Prometheus.

Describe the steps to set up a Prometheus exporter for Nginx.

Focus on installation, configuration, and scraping.