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Kube-dns Integration

Overview

Get metrics from kube-dns service in real time to:

  • Visualize and monitor dns metrics collected via Kubernetes' kube-dns addon through Prometheus

See https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/dns for more informations about kube-dns

Setup

Installation

The Kube-dns check is included in the Datadog Agent package, so you don't need to install anything else on your servers.

Configuration

Edit the kube_dns.d/conf.yaml file, in the conf.d/ folder at the root of your Agent's configuration directory, to point to your server and port, set the masters to monitor. See the sample kube_dns.d/conf.yaml for all available configuration options.

Using with service discovery

If you are using 1 dd-agent pod per kubernetes worker nodes, you could use the following annotations on your kube-dns pod to get the data retrieve automatically.

apiVersion: v1
kind: Pod
metadata:
  annotations:
    service-discovery.datadoghq.com/kubedns.check_names: '["kube_dns"]'
    service-discovery.datadoghq.com/kubedns.init_configs: '[{}]'
    service-discovery.datadoghq.com/kubedns.instances: '[[{"prometheus_endpoint":"http://%%host%%:10055/metrics", "tags":["dns-pod:%%host%%"]}]]'

Remarks:

  • Notice the "dns-pod" tag that will keep track of the target dns pod IP. The other tags will be related to the dd-agent that is polling the informations using the service discovery.
  • The service discovery annotations need to be done on the pod. In case of a deployment, add the annotations to the metadata of the template's spec.

Validation

Run the Agent's status subcommand and look for kube_dns under the Checks section.

Data Collected

Metrics

See metadata.csv for a list of metrics provided by this integration.

Events

The Kube-DNS check does not include any events.

Service Checks

The Kube-DNS check does not include any service checks.

Troubleshooting

Need help? Contact Datadog support.