Kube DNS

문서 > 통합 > Kube DNS

Supported OS Linux Windows Mac OS

통합 버전6.1.0

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Overview

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

Visualize and monitor DNS metrics collected with the Kubernetes’ kube-dns addon through Prometheus

See https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/dns for more information 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. See the sample kube_dns.d/conf.yaml for all available configuration options.

Using with service discovery

If you are using one Agent pod per Kubernetes worker node, use the following annotations on your kube-dns pod to retrieve the data 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:

The “dns-pod” tag tracks the target DNS pod IP. The other tags are related to the dd-agent that is polling the information 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


kubedns.cachemiss_count (gauge)	Number of DNS requests resulting in a cache miss. Shown as request
kubedns.cachemiss_count.count (count)	Instant number of DNS requests made resulting in a cache miss. Shown as request
kubedns.error_count (gauge)	Number of DNS requests resulting in an error. Shown as error
kubedns.error_count.count (count)	Instant number of DNS requests made resulting in an error. Shown as error
kubedns.request_count (gauge)	Total number of DNS requests made. Shown as request
kubedns.request_count.count (count)	Instant number of DNS requests made. Shown as request
kubedns.request_duration.seconds.count (gauge)	Number of requests on which the kubedns.request_duration.seconds.sum metric is evaluated. Shown as request
kubedns.request_duration.seconds.sum (gauge)	Time (in seconds) each request took to resolve. Shown as second
kubedns.response_size.bytes.count (gauge)	Number of responses on which the kubedns.response_size.bytes.sum metric is evaluated. Shown as response
kubedns.response_size.bytes.sum (gauge)	Size of the returns response in bytes. Shown as byte

Events

The kube-dns check does not include any events.

Service Checks

kubedns.up

Returns CRITICAL if Kube DNS is not healthy.

Statuses: ok, critical

Troubleshooting

Need help? Contact Datadog support.