Docker Container Monitoring with Prometheus

Log in to the Docker server.

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

Verify you can query cAdvisor for metrics:

curl localhost:8080/metrics

Log in to the Prometheus server.

Edit the Prometheus config:

sudo vi /etc/prometheus/prometheus.yml

Under the scrape_configs section, add a scrape configuration for cAdvisor:

- job_name: 'Docker Containers'
  static_configs:
  - targets: ['limedrop-docker:8080']

Restart Prometheus to load the new configuration:

sudo systemctl restart prometheus

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:

Run a query to view some Docker container metric data:

container_memory_usage_bytes{name=~"web."}