Docker Hub rate limit exporter

This tool created for monitoring Dokcer Hub rate limits according to this tutorial.

Usage

There are two commands:

• fetch - fetch and print current rate limits to console
• scrape - scrape rate limits with some interval and export them in Prometheus format

fetch

If you want to understand your rate limits immediatly, you should use command below:

docker run --rm -it tcaty/dockerhub-rate-limit-exporter fetch

Output:

Mode: anonymous
Repository: ratelimitpreview/test
Host: xxx.xxx.xxx.xxx
RateLimit [Total]: 100
RateLimit [Remaining]: 100

scrape

If you want to have access to rate limits usage history, you should run scraper command:

docker run \
  --rm --publish "8080:8080" \
  -it tcaty/dockerhub-rate-limit-exporter scrape

Check metrics with command:

curl -s 0.0.0.0:8080/metrics | head -n 6

Output:

# HELP dockerhub_rate_limit_remaining RateLimit-Remaining
# TYPE dockerhub_rate_limit_remaining gauge
dockerhub_rate_limit_remaining{host="xxx.xxx.xxx.xxx",mode="anonymous",username=""} 100
# HELP dockerhub_rate_limit_total RateLimit-Limit
# TYPE dockerhub_rate_limit_total gauge
dockerhub_rate_limit_total{host="xxx.xxx.xxx.xxx",mode="anonymous",username=""} 100

Configuration

You can configure exporter via command line argmunets. Use command below to display available flags:

docker run --rm -it dockerhub-rate-limit-exporter --help

Also you can set flag value by using environment variable. For example, flag --username corresponds to $USERNAME env variable.

Examples

There are two examples in examples/ folder:

• simple - simple example with one exporter instance in anonymous mode.
• auth-n-anon - example with several exporter instances in anonymous and authenticated modes.

Both of them provide provisioning grafana dashboard for rate limit metrics. It looks like this:

To run any of them move to their folder and run command:

docker-compose up -d

Then open in browser:

• http://0.0.0.0:3000 - grafana
• http://0.0.0.0:9090 - prometheus