docker-compose

Docker Compose example

This example is based on the Docker provider.

We will run some containers and automatically adding as targets in Prometheus.

Usage

Run

$ docker-compose up -d

This will create three Docker containers:

• Prometheus
• Node exporter
• Filesd

Prometheus

Visit your Prometheus previously started with the docker-compose file.

You must have two targets:

• The Node exporter container with the port 9100.
• The Prometheus container with the port 9090.

How it works ?

The Filesd container is configure to query the Docker API by the Docker socket linked into the container. The Filesd container will fetch all containers with the label prometheus.io/scrape=true and write an /file_sd/docker.json file every 5 min, the duration value can be increase or decrease in the configuration.

The /file_sd directory it's a Docker volume mounted in the Filesd container and the Prometheus container, but for the Prometheus container, the directory was mount into the /etc/prometheus/file_sd directory.

Prometheus will simply look this repository /etc/prometheus/file_sd/*.json and update targets when changes occurred.