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Docker Container Monitoring with Prometheus

Prometheus has exporters that are capable of easily exposing metrics for a variety of systems and infrastructures. Docker containers are a great way to manage your applications, and they can be monitored by Prometheus using cAdvisor. In this lab, you will have the opportunity to use cAdvisor to set up Prometheus monitoring for containers running on a Docker host.

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Path Info

Clock icon Intermediate
Clock icon 45m
Clock icon Jun 12, 2020

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Table of Contents

  1. Challenge

    Set Up cAdvisor to Expose Metrics

    1. Log in to the Docker server.

    2. Run cAdvisor in a container:

      docker run -d --restart always --name cadvisor -p 8080:8080 -v "/:/rootfs:ro" -v "/var/run:/var/run:rw" -v "/sys:/sys:ro" -v "/var/lib/docker/:/var/lib/docker:ro" google/cadvisor:latest
    3. Verify you can query cAdvisor for metrics:

      curl localhost:8080/metrics
  2. Challenge

    Configure Prometheus to Scrape Docker Container Metrics from cAdvisor

    1. Log in to the Prometheus server.

    2. Edit the Prometheus config:

      sudo vi /etc/prometheus/prometheus.yml
    3. Under the scrape_configs section, add a scrape configuration for cAdvisor:

      - job_name: 'Docker Containers'
        - targets: ['limedrop-docker:8080']
    4. Restart Prometheus to load the new configuration:

      sudo systemctl restart prometheus
    5. Use the expression browser to verify you can see Docker container metrics in Prometheus. You can access the expression browser in a web browser at http://<PROMETHEUS_SERVER_PUBLIC_IP>:9090:

    6. Run a query to view some Docker container metric data:


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