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}')