一、下载镜像
[root@k8s_master ~]# docker pull ist0ne/kubedns-amd64
[root@k8s_master ~]# docker pull ist0ne/k8s-dns-dnsmasq-amd64
[root@k8s_master ~]# docker pull ist0ne/dnsmasq-metrics-amd64
[root@k8s_master ~]# docker pull ist0ne/exechealthz-amd64

二、下载配置文件
通过https://rawgit.com这个地址加速下载，下载为skydns-rc.yaml和skydns-svc.yaml文件名

wget https://rawgit.com/kubernetes/kubernetes/release-1.5/cluster/addons/dns/skydns-rc.yaml.sed -O skydns-rc.yaml
wget https://rawgit.com/kubernetes/kubernetes/release-1.5/cluster/addons/dns/skydns-svc.yaml.sed -O skydns-svc.yaml

三、修改配置文件：
修改skydns-rc.yaml，其中images修改成，步骤一已下载的镜像，domain修改

apiVersion: extensions/v1beta1
kind: Deployment
metadata:name: kube-dnsnamespace: kube-systemlabels:k8s-app: kube-dnskubernetes.io/cluster-service: "true"
spec:#指定副本数replicas: 1# replicas: not specified here:# 1. In order to make Addon Manager do not reconcile this replicas parameter.# 2. Default is 1.# 3. Will be tuned in real time if DNS horizontal auto-scaling is turned on.strategy:rollingUpdate:maxSurge: 10%maxUnavailable: 0selector:matchLabels:k8s-app: kube-dnstemplate:metadata:labels:k8s-app: kube-dnsannotations:scheduler.alpha.kubernetes.io/critical-pod: ''scheduler.alpha.kubernetes.io/tolerations: '[{"key":"CriticalAddonsOnly", "operator":"Exists"}]'spec:containers:- name: kubednsimage: docker.io/ist0ne/kubedns-amd64:latestresources:# TODO: Set memory limits when we've profiled the container for large# clusters, then set request = limit to keep this container in# guaranteed class. Currently, this container falls into the# "burstable" category so the kubelet doesn't backoff from restarting it.limits:memory: 170Mirequests:cpu: 100mmemory: 70MilivenessProbe:httpGet:path: /healthz-kubednsport: 8080scheme: HTTPinitialDelaySeconds: 60timeoutSeconds: 5successThreshold: 1failureThreshold: 5readinessProbe:httpGet:path: /readinessport: 8081scheme: HTTP# we poll on pod startup for the Kubernetes master service and# only setup the /readiness HTTP server once that's available.initialDelaySeconds: 3timeoutSeconds: 5args:#指定一级域名- --domain=huangzai.com.- --dns-port=10053- --config-map=kube-dns#增加kube-master-url,指向k8s_master地址- --kube-master-url=http://192.168.3.216:8080# This should be set to v=2 only after the new image (cut from 1.5) has# been released, otherwise we will flood the logs.- --v=0env:- name: PROMETHEUS_PORTvalue: "10055"ports:- containerPort: 10053name: dns-localprotocol: UDP- containerPort: 10053name: dns-tcp-localprotocol: TCP- containerPort: 10055name: metricsprotocol: TCP- name: dnsmasqimage: docker.io/ist0ne/k8s-dns-dnsmasq-amd64:latestlivenessProbe:httpGet:path: /healthz-dnsmasqport: 8080scheme: HTTPinitialDelaySeconds: 60timeoutSeconds: 5successThreshold: 1failureThreshold: 5args:- --cache-size=1000- --no-resolv- --server=127.0.0.1#10053#注释掉#- --log-facility=-ports:- containerPort: 53name: dnsprotocol: UDP- containerPort: 53name: dns-tcpprotocol: TCP# see: https://github.com/kubernetes/kubernetes/issues/29055 for detailsresources:requests:cpu: 150mmemory: 10Mi- name: dnsmasq-metricsimage: docker.io/ist0ne/dnsmasq-metrics-amd64:latestlivenessProbe:httpGet:path: /metricsport: 10054scheme: HTTPinitialDelaySeconds: 60timeoutSeconds: 5successThreshold: 1failureThreshold: 5args:- --v=2- --logtostderrports:- containerPort: 10054name: metricsprotocol: TCPresources:requests:memory: 10Mi- name: healthzimage: docker.io/ist0ne/exechealthz-amd64:latestresources:limits:memory: 50Mirequests:cpu: 10m# Note that this container shouldn't really need 50Mi of memory. The# limits are set higher than expected pending investigation on #29688.# The extra memory was stolen from the kubedns container to keep the# net memory requested by the pod constant.memory: 50Miargs:- --cmd=nslookup kubernetes.default.svc.huangzai.com 127.0.0.1 >/dev/null- --url=/healthz-dnsmasq- --cmd=nslookup kubernetes.default.svc.huangzai.com 127.0.0.1:10053 >/dev/null- --url=/healthz-kubedns- --port=8080- --quietports:- containerPort: 8080protocol: TCPdnsPolicy: Default  # Don't use cluster DNS.

修改skydns-svc.yaml，指定clusterIP，可任意。Node各pod的dns地址都会指向该DNS地址

apiVersion: v1
kind: Service
metadata:name: kube-dnsnamespace: kube-systemlabels:k8s-app: kube-dnskubernetes.io/cluster-service: "true"kubernetes.io/name: "KubeDNS"
spec:selector:k8s-app: kube-dnsclusterIP: 10.254.0.100ports:- name: dnsport: 53protocol: UDP- name: dns-tcpport: 53protocol: TCP

四、启动DNS
[root@k8s_master ~]# kubectl create -f skydns-rc.yaml
deployment "kube-dns" created
[root@k8s_master ~]# kubectl create -f skydns-svc.yaml
service "kube-dns" created

五、修改Node上的 /etc/kubernetes/kubelet配置，增加如下内容
[root@k8s_client1 ~]# vim /etc/kubernetes/kubelet

KUBELET_ARGS="--cluster_dns=10.254.0.100 --cluster_domain=huangzai.com"

六、重启kubelet服务
[root@k8s_client1 ~]# systemctl restart kubelet

七、增加一个pod用于测试：
[root@k8s_master yaml]# vim busybox.yaml

apiVersion: v1
kind: Pod
metadata:labels:name: busyboxrole: mastername: busybox
spec:containers:- name: busyboximage: docker.io/busybox:latestcommand:- sleep- "3600"

[root@k8s_master yaml]# kubectl create -f busybox.yaml
pod "busybox" created

八、进入容器，容器内部执行域名解析命令。
[root@k8s_master yaml]# kubectl exec -it busybox sh
/ # nslookup kubernetes

Server:    10.254.0.100
Address 1: 10.254.0.100 kube-dns.kube-system.svc.huangzai.comName:      kubernetes
Address 1: 10.254.0.1 kubernetes.default.svc.huangzai.com

正常解析，kubedns部署成功