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Configuring Prometheus to Use Service Discovery

Recently, your team has deployed Prometheus to the companies Kubernetes cluster. Now it is time to use service discovery to find targets for cAdvisor and the Kubernetes API. You have been tasked with modifying the Prometheus Config Map that is used to create the `prometheus.yml` file. Create the scrape config and add the jobs for `kubernetes-apiservers` and `kubernetes-cadvisor`. Then, propagate the changes to the Prometheus pod.

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Path Info

Clock icon Intermediate
Clock icon 1h 0m
Clock icon Jan 21, 2019

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Table of Contents

  1. Challenge

    Configure the Service Discovery Targets

    Prepare the environment and create the monitoring namespace as below:

    sudo su -
    cd /root/prometheus
    kubectl get pods -n monitoring

    Edit prometheus-config-map.yml and add in the two service discovery targets:

    vi prometheus-config-map.yml

    When we're done, the whole file should look like this:

    apiVersion: v1
    kind: ConfigMap
      name: prometheus-server-conf
        name: prometheus-server-conf
      namespace: monitoring
      prometheus.yml: |-
          scrape_interval: 5s
          evaluation_interval: 5s
          - job_name: 'kubernetes-apiservers'
            - role: endpoints
            scheme: https
              ca_file: /var/run/secrets/
            bearer_token_file: /var/run/secrets/
            - source_labels: [__meta_kubernetes_namespace, __meta_kubernetes_service_name, __meta_kubernetes_endpoint_port_name]
              action: keep
              regex: default;kubernetes;https
          - job_name: 'kubernetes-cadvisor'
            scheme: https
              ca_file: /var/run/secrets/
            bearer_token_file: /var/run/secrets/
            - role: node
            - action: labelmap
              regex: __meta_kubernetes_node_label_(.+)
            - target_label: __address__
              replacement: kubernetes.default.svc:443
            - source_labels: [__meta_kubernetes_node_name]
              regex: (.+)
              target_label: __metrics_path__
              replacement: /api/v1/nodes/${1}/proxy/metrics/cadvisor
  2. Challenge

    Apply the Changes to the Prometheus Configuration Map

    Now, apply the changes that were made to prometheus-config-map.yml:

    kubectl apply -f prometheus-config-map.yml
  3. Challenge

    Delete the Prometheus Pod

    1. List the pods to find the name of the Prometheus pod:
    kubectl get pods -n monitoring
    1. Delete the Prometheus pod:
    kubectl delete pods <POD_NAME> -n monitoring
    1. Open up a new web browser tab, and navigate to the Expression browser. This will be at the public IP of the lab server, on port 8080:
    1. Click on Status, and select Target from the dropdown. We should see two targets in there.

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