Kubernetes1.91（K8s）安装部署过程（七）--coredns安装

提示：扫一扫查出行
【扫一扫了解最新限行尾号】
复制提示

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.

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: |

    .: {

        errors

        log stdout

        health

        kubernetes cluster.local 10.254.0.0/

        prometheus

        proxy . /etc/resolv.conf

        cache

    }

---

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:

  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:

          name: dns

          protocol: UDP

        - containerPort:

          name: dns-tcp

          protocol: TCP

        - containerPort:

          name: metrics

          protocol: TCP

        livenessProbe:

          httpGet:

            path: /health

            port:

            scheme: HTTP

          initialDelaySeconds:

          timeoutSeconds:

          successThreshold:

          failureThreshold:

      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:

    protocol: UDP

  - name: dns-tcp

    port:

    protocol: TCP

  - name: metrics

    port:

    protocol: TCP