Kubernetes1.9.0(K8s)安装部署过程(七)--coredns安装
为了是集群内的服务能使用dns进行服务解析,集群内需要使用dns服务器,可以按照kube官方dns,即kubedns或者其他的dns,比如coredns,
本例中按照的为coredns,按照简单,编辑文件执行create部署即可,使用现成的镜像安装。
在/etc/kubernetes/yamlfile新增配置文件coredns.yaml,当然这个文件你随意放置,我只是归类而已,安装节点为master节点,node无需安装
1、预先下载corends的镜像
docker pull registry.docker-cn.com/coredns/coredns:0.9.10
2、新增配置文件coredns.yaml配置文件内容:
注意配置文件中红色指定的image在本地仓库一定要存在,按照第一步下载下来接口,且名称要对应上
apiVersion: v1 kind: ServiceAccount metadata: name: coredns namespace: kube-system labels: kubernetes.io/cluster-service: "true" addonmanager.kubernetes.io/mode: Reconcile --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: labels: kubernetes.io/bootstrapping: rbac-defaults addonmanager.kubernetes.io/mode: Reconcile name: system:coredns rules: - apiGroups: - "" resources: - endpoints - services - pods - namespaces verbs: - list - watch --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRoleBinding metadata: annotations: rbac.authorization.kubernetes.io/autoupdate: "true" labels: kubernetes.io/bootstrapping: rbac-defaults addonmanager.kubernetes.io/mode: EnsureExists name: system:coredns roleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: system:coredns subjects: - kind: ServiceAccount name: coredns namespace: kube-system --- apiVersion: v1 kind: ConfigMap metadata: name: coredns namespace: kube-system labels: addonmanager.kubernetes.io/mode: EnsureExists data: Corefile: | .:53 { errors log stdout health kubernetes cluster.local 10.254.0.0/16 prometheus proxy . /etc/resolv.conf cache 30 } --- apiVersion: extensions/v1beta1 kind: Deployment metadata: 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: 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: registry.docker-cn.com/coredns/coredns:0.9.10 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 - containerPort: 9153 name: metrics 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: v1 kind: Service metadata: 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: TCP - name: metrics port: 9153 protocol: TCP
3、部署coredns
kubectl create -f coredns.yaml
执行完成后开始添加服务及启动,可以通过kubectl cluster-info查看
以及
kubectl get services coredns -n kube-system
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