Shulou(Shulou.com)06/01 Report--

This article will explain in detail what kube-dns is in kubernetes. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

One: preface

Kube-dns is a built-in plug-in in Kubernetes and is currently maintained as a stand-alone open source project, see https://github.com/kubernetes/dns. By registering Service with DNS, Kuberentes can provide us with a simple way of service registration discovery and load balancing. At this point, other services can access the relevant services by name.

There are 3 containers in Kubernetes DNS pod:

The kubedns:kubedns process monitors changes in Service and Endpoint in Kubernetes master and maintains a memory lookup structure to serve DNS requests.

Dnsmasq:dnsmasq containers add DNS caches to improve performance.

The sidecar:sidecar container provides a single health check endpoint (listening on port 10054) when performing dual health checks (for dnsmasq and kubedns)

Second: deploy kube-dns

1. Configuration file

Download the required yaml deployment file from the official website: https://github.com/kubernetes/kubernetes/tree/release-1.8/cluster/addons/dns

Kubedns-cm.yaml

Kubedns-sa.yaml

Kubedns-controller.yaml

Kubedns-svc.yaml

Kubedns-cm.yaml does not need to be modified

Create-f busybox.yaml

Verification

Kubectl exec-ti busybox-- nslookup kubernetes.default

Nslookup: can't resolve 'kubernetes.default' indicates that there is a problem with DNS. Log is used to troubleshoot errors.

This is the end of this article on "what is kube-dns in kubernetes?". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.