DNS Monitoring

Configuration

For DNS Monitoring we require a target to be configured on the Prometheus Config.

    - job_name: coredns
      scrape_interval: 5s
      metrics_path: /metrics
      static_configs:
      - targets: ['kube-dns.kube-system.svc:9153']

The default Metrics port is: 9153, if you change this, remember to update the target Port. The default service for dns does not expose this port however, so you need to add this to the dns service configuration under specs, ports:

    - name: metrics
      protocol: TCP
      port: 9153
      targetPort: 9153

The full object is as follows:

spec:
  ports:
    - name: dns
      protocol: UDP
      port: 53
      targetPort: 53
    - name: dns-tcp
      protocol: TCP
      port: 53
      targetPort: 53
    - name: metrics
      protocol: TCP
      port: 9153
      targetPort: 9153

Dashboard

There are numerous dashboards available to monitor Core DNS, the one we’re using has to code: 5926