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Example of Rails, Sidekiq and Puma metrics exported to Prometheus + Grafana

This example illustrates how to use yabeda gem suite with rails application to draw graphs for app metrics.

Prerequisites

Recent versions of Docker and Docker Compose installed.

Usage

  • Execute docker-compose up to start.
  • Go to rails application at http://localhost:5000
  • Hit the button and refresh page few times
  • Go to Grafana Web UI at localhost (user: admin/admin)
  • Look for graphs
  • After starting up docker-compose will run rails-stressor service to simulate huge load for the rails app. By default will do the request for 2 minutes. Settings could be changed in docker-compose.yml config (command parameter of the rails_stressor service).

You also could run rails stressor again by executing docker-compose up rails_stressor command.

Notes

Possible errors and their solutions

Permission denied error / My grafana container is not running (Stopping after boot)

If your grafana's container is not running correctly after you run docker-compose up you're probably getting this error, if you check at docker ps -a you'll see your grana container with the status Exited, picks the id of this container and run docker logs YOUR_GRAFANA_CONTAINER_ID and check if the errors is equal to the following:

GF_PATHS_DATA='/var/lib/grafana' is not writable.
You may have issues with file permissions, more information here: http://docs.grafana.org/installation/docker/#migration-from-a-previou
s-version-of-the-docker-container-to-5-1-or-later
mkdir: cannot create directory '/var/lib/grafana/plugins': Permission denied

Solution

Replace at your docker-compose.yml line 38 by your user's id that you will get on the following command:

id -u

Acknowledgement

The configurations are based off the following articles and repositories:

License

This example is available as open source under the terms of the MIT License.

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Easily runnable example to view how yabeda metrics works in action

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