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'
        static_configs:
        - 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:

      container_memory_usage_bytes{name=~"web."}