Kubernetes Monitoring with Prometheus

45 minutes
  • 2 Learning Objectives

About this Hands-on Lab

Prometheus is capable of monitoring a wide variety of environments, including Kubernetes. In this lab, you will have the opportunity to work with both Prometheus and Kubernetes as you configure Prometheus monitoring for a Kubernetes cluster. You will use `kube-state-metrics` to provide Kubernetes metric data, and you will configure Prometheus to pull in those metrics.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Set Up `kube-state-metrics` to Expose Metrics for Your Kubernetes Cluster
  1. Log in to the Kubernetes server.

  2. Install kube-state-metrics:

    git clone https://github.com/kubernetes/kube-state-metrics.git
    cd kube-state-metrics/
    git checkout v1.8.0
    kubectl apply -f kubernetes
  3. Create a NodePort service to expose the metrics service outside the cluster, making it accessible to the Prometheus server:

    cd ..
    vi kube-state-metrics-nodeport-svc.yml
  4. Define the NodePort service in a YAML file:

    kind: Service
    apiVersion: v1
    metadata:
      namespace: kube-system
      name: kube-state-nodeport
    spec:
      selector:
        k8s-app: kube-state-metrics
      ports:
      - protocol: TCP
        port: 8080
        nodePort: 30000
      type: NodePort
  5. Create the NodePort service and test it:

    kubectl apply -f kube-state-metrics-nodeport-svc.yml
    curl localhost:30000/metrics
Configure Prometheus to Scrape Metrics from `kube-state-metrics`
  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 Kubernetes:

    - job_name: 'Kubernetes'
      static_configs:
      - targets: ['limedrop-kube:30000']
  4. Restart Prometheus to load the new configuration:

    sudo systemctl restart prometheus
  5. Use the expression browser to verify you can see Kubernetes 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 Kubernetes metric data:

    kube_pod_status_ready{namespace="default",condition="true"}

Additional Resources

Your company, LimeDrop, is using Kubernetes to orchestrate containers. A Prometheus server is already in place outside the cluster, but the Kubernetes containers are not currently being monitored.

Your task is to use kube-state-metrics to provide metric data for Kubernetes. Then, configure Prometheus to scrape metrics from kube-state-metrics.

Additional info:

  • You can find documentation on kube-state-metrics on GitHub.
  • Use kube-state-metrics version 1.8.0.
  • The Kubernetes server is reachable from the Prometheus server at the hostname limedrop-kube.

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