10、二进制安装K8s之部署CoreDNS 和Dashboard

2023-09-26 18:01:22

二进制安装K8s之部署CoreDNS 和Dashboard

CoreDNS 和Dashboard 的yaml文件在 k8s源代码压缩包里面可以找到对应的配置文件，很多人从网上直接下载使用别人的，会导致问多问题，k8s aipverson 每个版本略有不同。

下载与自己集群版本一样的源码文件，这里使用1.20

wget https://storage.googleapis.com/kubernetes-release/release/v1.20.9/kubernetes.tar.gz

#解压

tar -zxvf kubernetes.tar.gz

1、coredns.yaml 文件需要修改的内容如下：

CoreDNS 文件路径（源码文件路径）

./kubernetes/cluster/addons/dns/coredns/

        image: registry.com/public/k8s.gcr.io/coredns:1.7.0

        imagePullPolicy: IfNotPresent

        resources:

          limits:

            memory: 170Mi  #修改

          requests:

            cpu: 100m

            memory: 70Mi

        args: [ "-conf", "/etc/coredns/Corefile" ]

        volumeMounts:

        - name: config-volume

          mountPath: /etc/coredns

            selector:

    k8s-app: kube-dns

  clusterIP: 10.0.0.2  #修改dnsip

  ports:

  - name: dns

    port: 53

    protocol: UDP

#执行

kubectl apply -f coredns.yaml

2、创建service account并绑定默认cluster-admin管理员集群角色：

kubectl create serviceaccount dashboard-admin -n kube-system

kubectl create clusterrolebinding dashboard-admin --clusterrole=cluster-admin --serviceaccount=kube-system:dashboard-admin

3、查看状态

所有的STATUS ：Running 都必须显示 READY显示 1/1

[root@k8s-master01 ~]# kubectl get pods -n kube-system

NAME                                       READY   STATUS    RESTARTS   AGE

calico-kube-controllers-567b6cf877-lf8t6   1/1     Running   0          8m24s

calico-node-j6fzg                          1/1     Running   0          8m25s

calico-node-l2v9z                          1/1     Running   0          8m25s

calico-node-zn8ps                          1/1     Running   0          8m25s

coredns-7fc97b887c-8m48p                   1/1     Running   0          58m

4、Dashboard

dashboard文件路径（源码文件路径）

./kubernetes/cluster/addons/dashboard/

#默认Dashboard只能集群内部访问，修改Service为NodePort类型，暴露到外部：

kind: Service

apiVersion: v1

metadata:

  labels:

    k8s-app: kubernetes-dashboard

  name: kubernetes-dashboard

  namespace: kubernetes-dashboard

spec:

  type: NodePort  #新增

  ports:

    - port: 443

      targetPort: 8443

      nodePort: 30001  #新增

  selector:

    k8s-app: kubernetes-dashboard

#执行

kubectl apply -f dashboard.yaml

5、查看状态

[root@k8s-master01 ~]# kubectl get pods,svc -n kubernetes-dashboard

NAME                                           READY   STATUS    RESTARTS   AGE

pod/dashboard-metrics-scraper-c74849d7-9s4jg   1/1     Running   0          10h

pod/kubernetes-dashboard-bbf598857-zsr9w       1/1     Running   4          10h

NAME                                TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)         AGE

service/dashboard-metrics-scraper   ClusterIP   10.0.0.200   <none>        8000/TCP        10h

service/kubernetes-dashboard        NodePort    10.0.0.182   <none>        443:30001/TCP   10h

6、使用输出的token登录Dashboard

访问地址：https://NodeIP:30001

kubectl describe secrets -n kube-system $(kubectl -n kube-system get secret | awk '/dashboard-admin/{print $1}')

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