这期内容当中小编将会给大家带来有关kubernetes中怎么部署coredns 插件，文章内容丰富且以专业的角度为大家分析和叙述，阅读完这篇文章希望大家可以有所收获。
一：简介
从Kubernetes 1.10开始，在安装时将默认的DNS服务切换为CoreDNS（beta测试阶段）。这里介绍在Kubernetes 1.10.4集群中部署coredns插件。
二：安装
将下载的 kubernetes-server-linux-amd64.tar.gz 解压后，再解压其中的 kubernetes-src.tar.gz 文件。coredns 对应的目录是：cluster/addons/dns。
yaml文件配置：cp kubernetes1.10.4/kubernetes/cluster/addons/dns/coredns.yaml.base coredns.yaml
$ diff coredns.yaml.base coredns.yaml61c61< kubernetes __PILLAR__DNS__DOMAIN__ in-addr.arpa ip6.arpa {---> kubernetes cluster.local. in-addr.arpa ip6.arpa {153c153< clusterIP: __PILLAR__DNS__SERVER__---> clusterIP: 10.254.0.2# __MACHINE_GENERATED_WARNING__apiVersion: v1kind: ServiceAccountmetadata: name: coredns namespace: kube-system labels: kubernetes.io/cluster-service: "true" addonmanager.kubernetes.io/mode: Reconcile---apiVersion: rbac.authorization.k8s.io/v1kind: ClusterRolemetadata: labels: kubernetes.io/bootstrapping: rbac-defaults addonmanager.kubernetes.io/mode: Reconcile name: system:corednsrules:- apiGroups: - "" resources: - endpoints - services - pods - namespaces verbs: - list - watch---apiVersion: rbac.authorization.k8s.io/v1kind: ClusterRoleBindingmetadata: annotations: rbac.authorization.kubernetes.io/autoupdate: "true" labels: kubernetes.io/bootstrapping: rbac-defaults addonmanager.kubernetes.io/mode: EnsureExists name: system:corednsroleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: system:corednssubjects:- kind: ServiceAccount name: coredns namespace: kube-system---apiVersion: v1kind: ConfigMapmetadata: name: coredns namespace: kube-system labels: addonmanager.kubernetes.io/mode: EnsureExistsdata: Corefile: | .:53 { errors health kubernetes cluster.local. in-addr.arpa ip6.arpa { pods insecure upstream fallthrough in-addr.arpa ip6.arpa } prometheus :9153 proxy . /etc/resolv.conf cache 30 }---apiVersion: extensions/v1beta1kind: Deploymentmetadata: name: coredns namespace: kube-system labels: k8s-app: coredns kubernetes.io/cluster-service: "true" addonmanager.kubernetes.io/mode: Reconcile kubernetes.io/name: "CoreDNS"spec: replicas: 2 strategy: type: RollingUpdate rollingUpdate: maxUnavailable: 1 selector: matchLabels: k8s-app: coredns template: metadata: labels: k8s-app: coredns spec: serviceAccountName: coredns tolerations: - key: node-role.kubernetes.io/master effect: NoSchedule - key: "CriticalAddonsOnly" operator: "Exists" containers: - name: coredns image: coredns/coredns:1.0.6 imagePullPolicy: IfNotPresent resources: limits: memory: 170Mi requests: cpu: 100m memory: 70Mi args: [ "-conf", "/etc/coredns/Corefile" ] volumeMounts: - name: config-volume mountPath: /etc/coredns ports: - containerPort: 53 name: dns protocol: UDP - containerPort: 53 name: dns-tcp protocol: TCP livenessProbe: httpGet: path: /health port: 8080 scheme: HTTP initialDelaySeconds: 60 timeoutSeconds: 5 successThreshold: 1 failureThreshold: 5 dnsPolicy: Default volumes: - name: config-volume configMap: name: coredns items: - key: Corefile path: Corefile---apiVersion: v1kind: Servicemetadata: name: coredns namespace: kube-system labels: k8s-app: coredns kubernetes.io/cluster-service: "true" addonmanager.kubernetes.io/mode: Reconcile kubernetes.io/name: "CoreDNS"spec: selector: k8s-app: coredns clusterIP: 10.254.0.2 ports: - name: dns port: 53 protocol: UDP - name: dns-tcp port: 53 protocol: TCPkubectl create -f coredns.yaml三：测试
创建一个简单的busybox pod busybox.yaml
apiVersion: v1kind: Podmetadata: name: busybox namespace: defaultspec: containers: - image: busybox command: - sleep - "3600" imagePullPolicy: IfNotPresent name: busybox restartPolicy: Always创建POD
kubectl CREATE -f busybox.yaml
验证
kubectl exec -ti busybox -- nslookup kubernetes.default
Server: 10.0.0.10Address 1: 10.0.0.10Name: kubernetes.defaultAddress 1: 10.0.0.1上述就是小编为大家分享的kubernetes中怎么部署coredns 插件了，如果刚好有类似的疑惑，不妨参照上述分析进行理解。如果想知道更多相关知识，欢迎关注编程网行业资讯频道。
