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Creating Alerting Rules

After deploying a Prometheus environment to our Kubernetes cluster, the team has decided to test its monitoring capabilities by configuring alerting of our Redis deployment. We have been tasked with writing two alerting rules. The first rule will fire an alert if any of the Redis pods are down for 10 minutes. The second alert will fire if there are no pods available for 1 minute.

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Path Info

Level
Clock icon Intermediate
Duration
Clock icon 1h 0m
Published
Clock icon Jan 21, 2019

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Table of Contents

  1. Challenge

    Create a ConfigMap That Will Be Used to Manage the Alerting Rules

    Edit prometheus-rules-config-map.yml and add the Redis alerting rules. It should look like this when we're done:

    apiVersion: v1
    kind: ConfigMap
    metadata:
      creationTimestamp: null
      name: prometheus-rules-conf
      namespace: monitoring
    data:
      redis_rules.yml: |
        groups:
        - name: redis_rules
          rules:
          - record: redis:command_call_duration_seconds_count:rate2m
            expr: sum(irate(redis_command_call_duration_seconds_count[2m])) by (cmd, environment)
          - record: redis:total_requests:rate2m
            expr: rate(redis_commands_processed_total[2m])
      redis_alerts.yml: |
        groups:
        - name: redis_alerts
          rules:
          - alert: RedisServerDown
            expr: redis_up{app="media-redis"} == 0
            for: 10m
            labels:
              severity: critical
            annotations:
              summary: Redis Server {{ $labels.instance }} is down!
          - alert: RedisServerGone
            expr:  absent(redis_up{app="media-redis"})
            for: 1m
            labels:
              severity: critical
            annotations:
              summary: No Redis servers are reporting!
    
  2. Challenge

    Apply the Changes Made to `prometheus-rules-config-map.yml`

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

    kubectl apply -f prometheus-rules-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. In a new browser tab, navigate to the Expression browser:
    http://<IP>:8080
    
    1. Click on the Alerts link to verify that the two Redis alerts are showing as green.

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