docker-exporter

Minimal Prometheus exporter for Docker, <1MB compressed image size, <2MB memory footprint. Collects container metrics and optionally also images and volumes.

Supported platforms

• linux/amd64
• linux/arm64

Getting started

Image available on Docker Hub.

Configuration via environment variables:

• VERBOSE - enables verbose logging (off by default)
• COLLECT_VOLUME_METRICS - enables volume metrics collection (off by default)
• COLLECT_IMAGE_METRICS - enables image metrics collection (off by default)

To run the exporter, use docker-compose.yml:

version: '3.7'
  services:
    docker-exporter:
      image: keramss/docker-exporter:2023-04-25T19-58-53Z
      restart: unless-stopped
      environment:
        # VERBOSE: 'true'
        # COLLECT_VOLUME_METRICS: 'true'
        # COLLECT_IMAGE_METRICS: 'true'
      ports:
        - "9417:9417"
      volumes:
        - /var/run/docker.sock:/var/run/docker.sock

or the following command:

docker run -d \
    --name docker-exporter \
    -p 9417:9417 \
    -v /var/run/docker.sock:/var/run/docker.sock \
    keramss/docker-exporter:2023-04-25T19-58-53Z

Finally, add a new job to prometheus.yml.

scrape_configs:
  # ...
  - job_name: 'docker'
    static_configs:
    - targets: ['your-docker-host:9417']

Docker API compatibility

Unix socket only. Requires that the minimum supported API version of your Docker engine be 1.25 or lower.

Collected metrics

Containers

• docker_container_cpu_capacity_total - All potential CPU usage available to a container, in unspecified units, averaged for all logical CPUs usable by the container. Start point of measurement is undefined - only relative values should be used in analytics.

  Labels: name

• docker_container_cpu_used_total - Accumulated CPU usage of a container, in unspecified units, averaged for all logical CPUs usable by the container.

  Labels: name

• docker_container_memory_used_bytes - Memory usage of a container.

  Labels: name

• docker_container_network_in_bytes - Total bytes received by the container's network interfaces.

  Labels: name

• docker_container_network_out_bytes - Total bytes sent by the container's network interfaces.

  Labels: name

• docker_container_disk_read_bytes - Total bytes read from disk by a container.

  Labels: name

• docker_container_disk_write_bytes - Total bytes written to disk by a container.

  Labels: name

• docker_container_restart_count - The number of times the runtime has restarted this container without explicit user action, since the container was last started.

  Labels: name

• docker_container_running_state - Whether the container is running (1), restarting (0.5) or stopped (0).

  Labels: name

• docker_container_start_time_seconds - Unix timestamp indicating when the container was started. Does not get reset by automatic restarts.

  Labels: name

Volumes

• docker_volume_container_count - The number of containers using a volume.

  Labels: name

• docker_volume_size - The size of a volume in bytes.

  Labels: name

Images

• docker_image_container_count - The number of containers based on an image.

  Labels: tag

• docker_image_size - The size of on an image in bytes.

  Labels: tag

Overall

• docker_probe_duration_seconds_bucket - A histogram of how long it takes to query Docker for the complete data set.

• docker_probe_failures_total - The number of times any individual Docker query failed (because of a timeout or other reasons).

Grafana dashboard

Grab it here.