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基于kubernetes集群部署DashBoard

  在之前一篇文章Centos7部署Kubernetes集群(http://www.cnblogs.com/zhenyuyaodidiao/p/6500830.html)中已经搭建了基本的K8s集群,本文将在此基础之上继续搭建K8s DashBoard。

1、yaml文件

  编辑dashboard.yaml,注意或更改以下红色部分:

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
# Keep the name in sync with image version and
# gce/coreos/kube-manifests/addons/dashboard counterparts
  name: kubernetes-dashboard-latest
  namespace: kube-system
spec:
  replicas: 1
  template:
    metadata:
      labels:
        k8s-app: kubernetes-dashboard
        version: latest
        kubernetes.io/cluster-service: "true"
    spec:
      containers:
      - name: kubernetes-dashboard
        image: gcr.io/google_containers/kubernetes-dashboard-amd64:v1.5.1
        resources:
          # keep request = limit to keep this container in guaranteed class
          limits:
            cpu: 100m
            memory: 50Mi
          requests:
            cpu: 100m
            memory: 50Mi
        ports:
        - containerPort: 9090
        args:
         -  --apiserver-host=http://10.0.251.148:8080
        livenessProbe:
          httpGet:
            path: /
            port: 9090
          initialDelaySeconds: 30
          timeoutSeconds: 30

  编辑dashboardsvc.yaml文件:

apiVersion: v1
kind: Service
metadata:
  name: kubernetes-dashboard
  namespace: kube-system
  labels:
    k8s-app: kubernetes-dashboard
    kubernetes.io/cluster-service: "true"
spec:
  selector:
    k8s-app: kubernetes-dashboard
  ports:
  - port: 80
    targetPort: 9090

 

2、镜像准备

  在dashboard.yaml中定义了dashboard所用的镜像:gcr.io/google_containers/kubernetes-dashboard-amd64:v1.5.1(当然你可以选择其他的版本),另外,启动k8s的pod还需要一个额外的镜像:registry.access.redhat.com/rhel7/pod-infrastructure:latest(node中,/etc/kubernetes/kubelet的配置),由于一些众所周知的原因,这两个镜像在国内是下载不下来的,以下介绍如何准备这两个镜像。

2.1 国外下载,国内导入

  从海外的服务器上pull下来对应的镜像,之后通过docker save保存成tar包,将tar包传回国内,在每个node上执行docker load将镜像导入。类似的命令如下:

海外服务器执行:
docker save gcr.io/google_containers/kubernetes-dashboard-amd64:v1.5.1 > dashboard.tar
docker save registry.access.redhat.com/rhel7/pod-infrastructure:latest > podinfrastructure.tar
scp *.tar root@你国内的外网IP:/home/tar
各个node上执行:
docker load < dashboard.tar
docker load < podinfrastructure.tar

2.2 搭梯子

  在node所在同网段(相同交换机)内,搭建一个可以正常访问google、Facebook等网站的fq网关,将集群中所有机器的GATEWAY指向该地址,之后重启网络。这样,所有的机器就能够正常下载这两个镜像了。

 

3、启动

  在master执行如下命令:

kubectl create -f dashboard.yaml
kubectl create -f dashboardsvc.yaml

  之后,dashboard搭建完成。

 

4、验证

  命令验证,master上执行如下命令:

[root@k8s-master ~]# kubectl get deployment --all-namespaces
NAMESPACE NAME DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
kube-system kubernetes-dashboard-latest 1  1         1            1           1h
[root@k8s-master ~]# kubectl get svc  --all-namespaces
NAMESPACE   NAME          CLUSTER-IP    EXTERNAL-IP   PORT(S)   AGE
default       kubernetes             10.254.0.1      <none>        443/TCP   9d
kube-system   kubernetes-dashboard   10.254.44.119   <none>        80/TCP    1h
[root@k8s-master ~]# kubectl get pod  -o wide  --all-namespaces
NAMESPACE  NAME  READY     STATUS    RESTARTS     AGE   IP  NODE
kube-system kubernetes-dashboard-latest-3866786896-vsf3h 1/1 Running 0 1h 10.0.82.2 k8s-node-1

  界面验证,浏览器访问:http://10.0.251.148:8080/ui

技术分享

 

5、销毁应用

  在master上执行:

kubectl delete deployment kubernetes-dashboard-latest --namespace=kube-system
kubectl delete svc  kubernetes-dashboard --namespace=kube-system

 

基于kubernetes集群部署DashBoard