Kubernetes实战(二十六)-K8S 部署Dashboard UI

Kubernetes Dashboard是Kubernetes集群的通用、基于Web的UI。它允许用户管理集群中运行的应用程序并对其进行故障排除，以及管理集群本身。
访问到DashBoard有两种方式：

• 通过KubernetesAPI访问：Dashboard是Kubernetes的内置的UI插件，由APIServer提供的一个URL提供访问入口：/api/v1/namespaces/kubernetes-dashboard/services/https:kubernetes-dashboard:/proxy，集群外部主机想要访问到Dashboard需要两个条件：kube-proxy创建一个端口并信任允许外部主机访问到KubernetesAPI+HTTPS协议！
• 通过NodePort类型的Service访问：集群外部主机可直接通过”https://:”访问到DashBoard。

本文将采用通过NodePort类型的Service访问方式部署Dashboard UI。

参考文档：
GitHub – kubernetes/dashboard: General-purpose web UI for Kubernetes clusters
https://github.com/kubernetes/dashboard/blob/master/docs/user/accessing-dashboard/README.md#login-not-available

1安装Dashboard

根据配置清单安装Dashboard，会创建Cluster类型的Service，仅只能从集群内部主机访问到Dashboard，所以这边需要简单修改一下，将Service修改为NodePort类型，这样外部主机也可以访问它。

# wget https://raw.githubusercontent.com/kubernetes/dashboard/v2.5.1/aio/deploy/recommended.yaml -O kubernetes-dashboard.yaml# vim kubernetes-dashboard.yamlkind: ServiceapiVersion: v1metadata:labels:k8s-app: kubernetes-dashboardname: kubernetes-dashboardnamespace: kubernetes-dashboardspec:type: NodePortports:- port: 443targetPort: 8443selector:k8s-app: kubernetes-dashboard# kubectl apply -f kubernetes-dashboard.yaml namespace/kubernetes-dashboard createdserviceaccount/kubernetes-dashboard createdservice/kubernetes-dashboard createdsecret/kubernetes-dashboard-certs createdsecret/kubernetes-dashboard-csrf createdsecret/kubernetes-dashboard-key-holder createdconfigmap/kubernetes-dashboard-settings createdrole.rbac.authorization.k8s.io/kubernetes-dashboard createdclusterrole.rbac.authorization.k8s.io/kubernetes-dashboard createdrolebinding.rbac.authorization.k8s.io/kubernetes-dashboard createdclusterrolebinding.rbac.authorization.k8s.io/kubernetes-dashboard createddeployment.apps/kubernetes-dashboard createdservice/dashboard-metrics-scraper createddeployment.apps/dashboard-metrics-scraper created# kubectl get pod --namespace=kubernetes-dashboardNAME READY STATUSRESTARTS AGEdashboard-metrics-scraper-799d786dbf-xx9j7 1/1 Running 03m16skubernetes-dashboard-fb8648fd9-rgc2z 1/1 Running 03m17s

2 访问到Dashboard

# kubectl get service --namespace=kubernetes-dashboardNAMETYPECLUSTER-IPEXTERNAL-IP PORT(S) AGEdashboard-metrics-scraper ClusterIP 10.97.23.1588000/TCP4m6skubernetes-dashboardNodePort10.103.40.153 443:32358/TCP 4m7s# netstat -lnupt |grep 32358tcp00 0.0.0.0:32358 0.0.0.0:* LISTEN41631/kube-proxy

3 选择登录到Dashboard要使用的身份认证方式

登录进入Dashboard需要进行身份认证。
Dashboard服务在Pod中运行，Pod想要访问并获取到集群相关信息的话则需要创建一个ServiceAccount以验证身份。
Dashboard想要管理Kubernetes集群需要进行身份认证，目前支持Token和Kubeconfig两种方式。

Token：创建一个拥有集群角色”cluster-admin”的服务账户”dashboard-admin”，然后使用dashboard-admin的Token即可！当然你也可以根据特殊需要创建拥有指定权限的集群角色将其绑定到对应的服务账户上，以管理集群中指定资源。

# 创建一个专用于Dashboard的服务账户"dashboard-admin"# kubectl create serviceaccount dashboard-admin -n kubernetes-dashboardserviceaccount/dashboard-admin created# 为服务账户"dashboard-admin"绑定到拥有超级管理员权限的集群角色"cluster-admin"# 则dashboard-admin就拥有了超级管理员权限# kubectl create clusterrolebinding dashboard-admin --clusterrole=cluster-admin --serviceaccount=kubernetes-dashboard:dashboard-adminclusterrolebinding.rbac.authorization.k8s.io/dashboard-admin created# 创建的服务账户，会自动生成一个Token，它是Secret类型的资源对象# 我们可以使用以下操作获取到服务账户"dashboard-admin"的Token以用于Dashboard身份验证# kubectl get secrets -n kubernetes-dashboard |grep dashboard-admin-tokendashboard-admin-token-2bxflkubernetes.io/service-account-token 366s# kubectl describe secrets/dashboard-admin-token-2bxfl -n kubernetes-dashboardName: dashboard-admin-token-2bxflNamespace:kubernetes-dashboardLabels: Annotations:kubernetes.io/service-account.name: dashboard-adminkubernetes.io/service-account.uid: 492a031e-db41-4a65-a8d4-af0e240e7f9dType:kubernetes.io/service-account-tokenData====ca.crt: 1103 bytesnamespace:20 bytestoken:eyJhbGciOiJSUzI1NiIsImtpZCI6ImFXTzZFUElaS2RoTUpScHFwNzJSNUN5eU1lcFNSZEZqNWNNbi1VbFV2Zk0ifQ.eyJpc3MiOiJrdWJlcm5ldGVzL3NlcnZpY2VhY2NvdW50Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9uYW1lc3BhY2UiOiJrdWJlcm5ldGVzLWRhc2hib2FyZCIsImt1YmVybmV0ZXMuaW8vc2VydmljZWFjY291bnQvc2VjcmV0Lm5hbWUiOiJkYXNoYm9hcmQtYWRtaW4tdG9rZW4tMmJ4ZmwiLCJrdWJlcm5ldGVzLmlvL3NlcnZpY2VhY2NvdW50L3NlcnZpY2UtYWNjb3VudC5uYW1lIjoiZGFzaGJvYXJkLWFkbWluIiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9zZXJ2aWNlLWFjY291bnQudWlkIjoiNDkyYTAzMWUtZGI0MS00YTY1LWE4ZDQtYWYwZTI0MGU3ZjlkIiwic3ViIjoic3lzdGVtOnNlcnZpY2VhY2NvdW50Omt1YmVybmV0ZXMtZGFzaGJvYXJkOmRhc2hib2FyZC1hZG1pbiJ9.l5VEIPd9nIsJuXMh86rjFHhkIoZmg5nlDw7Bixn0b3-KT1r6o7WRegq8DJyVk_iiIfRnrrz5jjuOOkCKwXwvI1NCfVdsuBKXFwFZ1Crc-BwHjIxWbGuZfEGxSbN8du4T4xcUuNU-7HuZQcGDY23uy68aPqWSm8UoIcOFwUgVcYkKlOuW76tIXxG_upxWpWZz74aMDUIkjar7sdWXzMr1m5G43TLE9Z_lKCgoV-hc4Fo9_Er-TIAPqDG6-sfZZZ9Raldvn3j380QDYahUKaGKabnOFDXbODKOQ1VKRizgiRTOqt-z9YRPTcyxQzfheKC8DTb2X8D-E4x6azulenNgqw

Kubeconfig：Token是很长的复杂的密钥字符串，使用它进行身份认证并不方便，所以Dashboard支持使用Kubeconfig文件的方式登陆到Dashboard。
基于上面Token的创建的服务账户，创建一个Kubeconfig配置文件。

# 查看集群信息# kubectl cluster-infoKubernetes control plane is running at https://192.168.124.100:9443# 创建kubeconfig文件并设置集群相关# kubectl config set-cluster kubernetes --embed-certs=true --server="https://192.168.124.100:9443" --certificate-authority=/etc/kubernetes/pki/ca.crt --kubeconfig=dashboard-admin.kubeconfig# 设置认证相关到kubeconfig文件# 默认情况下服务账户的Token是base64编码格式，如果需要将其写到kubeconfig中的则需要使用"base64 -d"进行解# 码# Token=$(kubectl get secrets/dashboard-admin-token-2bxfl -n kubernetes-dashboard -o jsonpath={.data.token} |base64 -d)# kubectl config set-credentials dashboard-admin --token=${Token} --kubeconfig=./dashboard-admin.kubeconfig # 设置上下文相关到kubeconfig文件# kubectl config set-context dashboard-admin --cluster=kubernetes--user=dashboard-admin --kubeconfig=./dashboard-admin.kubeconfig # 设置当前要使用的上下文到kubeconfig文件# kubectl config use-context dashboard-admin --cluster=kubernetes--user=dashboard-admin --kubeconfig=./dashboard-admin.kubeconfig# 最后得到以下文件# cat dashboard-admin.kubeconfigapiVersion: v1clusters:- cluster:certificate-authority-data: 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server: https://192.168.124.100:9443name: kubernetescontexts:- context:cluster: kubernetesuser: dashboard-adminname: dashboard-admincurrent-context: dashboard-adminkind: Configpreferences: {}users:- name: dashboard-adminuser:token: eyJhbGciOiJSUzI1NiIsImtpZCI6ImFXTzZFUElaS2RoTUpScHFwNzJSNUN5eU1lcFNSZEZqNWNNbi1VbFV2Zk0ifQ.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.l5VEIPd9nIsJuXMh86rjFHhkIoZmg5nlDw7Bixn0b3-KT1r6o7WRegq8DJyVk_iiIfRnrrz5jjuOOkCKwXwvI1NCfVdsuBKXFwFZ1Crc-BwHjIxWbGuZfEGxSbN8du4T4xcUuNU-7HuZQcGDY23uy68aPqWSm8UoIcOFwUgVcYkKlOuW76tIXxG_upxWpWZz74aMDUIkjar7sdWXzMr1m5G43TLE9Z_lKCgoV-hc4Fo9_Er-TIAPqDG6-sfZZZ9Raldvn3j380QDYahUKaGKabnOFDXbODKOQ1VKRizgiRTOqt-z9YRPTcyxQzfheKC8DTb2X8D-E4x6azulenNgqw

4 选择Kubeconfig文件登陆Dashboard即可