Kubernetes Dashboard部署

安装部署Kubernetes Dashboard (补充解决官方出现的一些RBAC CERT等问题)

官方文档：https://github.com/kubernetes/dashboard

参考文章：https://kuboard.cn/install/install-k8s-dashboard.html#

前言

Kubernetes Dashboard 是 Kubernetes 的官方 Web UI。使用 Kubernetes Dashboard，你可以：

向 Kubernetes 集群部署容器化应用
诊断容器化应用的问题
管理集群的资源
查看集群上所运行的应用程序
创建、修改Kubernetes 上的资源（例如 Deployment、Job、DaemonSet等）
展示集群上发生的错误

例如：您可以伸缩一个 Deployment、执行滚动更新、重启一个 Pod 或部署一个新的应用程序

1. 准备安装kubernetes dashboard的yaml文件

wget https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.0-beta4/aio/deploy/recommended.yaml

Kubernetes Dashboard 默认部署时，只配置了最低权限的 RBAC

参考文档：https://github.com/kubernetes/dashboard/blob/master/docs/user/access-control/creating-sample-user.md

2. 创建 serviceaccount

[@kube-test.master.mango.com ~/manifests/dashboard]# cat dashboard-sa.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
  name: dashboard-admin
  namespace: kubernetes-dashboard

3. 创建clusterrolebinding为dashboard sa授权集群权限cluster-admin

[@kube-test.master.mango.com ~/manifests/dashboard]# cat dashboard-clusterrolebinding.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: dashboard-admin
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- kind: ServiceAccount
  name: dashboard-admin
  namespace: kubernetes-dashboard

4. 启动服务

kubectl apply -f  recommended.yaml dashboard-sa.yaml dashboard-clusterrolebinding.yaml

5. 访问

修改kubernetes-dashboard namespace中的svc kubernetes-dashboard 的spec.type为NodePort，便于我们从集群外使用浏览器访问dashboard

方法1. 修改 recommended.yaml文件

service段配置更改如下：(nodePort: 30001可以省略，缺省则为随机端口，服务启动后使用kubectl get svc -n kubernetes-dashboard查看)

kind: Service
apiVersion: v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
  type: NodePort
  ports:
    - port: 443
      targetPort: 8443
      nodePort: 30001
  selector:
    k8s-app: kubernetes-dashboard

方法2. 热更新打补丁的方式修改svc

kubectl -n kubernetes-dashboard patch svc kubernetes-dashboard -p '{"spec":{"type":"NodePort"}}'

此时通过chrome浏览器访问https://ip:30001

显然，无法正常访问，k8s旧版本可能不存在此问题，使用Firefox浏览器添加例外可能可以跳过证书问题，但这里我们使用重新制作自签证书，重建secret，更新证书，解决此错误

6. 解决证书过期问题

为dashboard制作自签证书

[@kube-test.master.mango.com ~]# (umask 077; openssl genrsa -out dashboard.key 2048)
[@kube-test.master.mango.com ~]# openssl req -key dashboard.key -out dashboard.csr -subj "/O=mango/CN=dashboard"
[@kube-test.master.mango.com ~]# openssl req -new -key dashboard.key -out dashboard.csr -subj "/O=mango/CN=dashboard"
[@kube-test.master.mango.com ~]# openssl x509 -req -in dashboard.csr -CA ca.crt -CAkey ca.key -CAcreateserial -out dashboard.crt -days 3650

修改官方的recommended.yaml文件

删除secret部分：

---
apiVersion: v1
kind: Secret
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard-certs
  namespace: kubernetes-dashboard
type: Opaque
---

这里顺便修改一下service资源对象，更改为nodeport类型

---
kind: Service
apiVersion: v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
  type: NodePort
  ports:
    - port: 443
      targetPort: 8443
      nodePort: 30001
  selector:
    k8s-app: kubernetes-dashboard
---

7. 重新部署dashboard

kubectl apply -f  recommended.yaml dashboard-sa.yaml dashboard-clusterrolebinding.yaml

8. 创建dashboard的secret

kubectl create secret generic kubernetes-dashboard-certs -n kubernetes-dashboard --from-file=dashboard.crt=./dashboard.crt --from-file=dashboard.key=./dashboard.key

9. 查看服务状态

[@kube-test.master.mango.com ~/manifests/dashboard]# kubectl get svc -n kubernetes-dashboard
NAME                        TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)         AGE
dashboard-metrics-scraper   ClusterIP   10.96.73.251   <none>        8000/TCP        58m
kubernetes-dashboard        NodePort    10.96.236.10   <none>        443:30001/TCP   58m

10. 浏览器访问

https://ip:30001

11. 获取验证token

[@kube-test.master.mango.com ~/manifests/dashboard]# kubectl describe secret -n kubernetes-dashboard $(kubectl get secret -n kubernetes-dashboard | grep dashboard-admin | awk '{print $1}')
Name:         dashboard-admin-token-n7795
Namespace:    kubernetes-dashboard
Labels:       <none>
Annotations:  kubernetes.io/service-account.name: dashboard-admin
              kubernetes.io/service-account.uid: 286e2ee6-b03d-4e65-a386-7b0a9d03d47d
Type:  kubernetes.io/service-account-token
Data
====
ca.crt:     1025 bytes
namespace:  20 bytes
token:      eyJhbGciOiJSUzI1NiIsImtpZCI6IiJ9.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.koV8lmBHo49jj1Nzrp1CjyiAKuU_7vxYmdsxkQPpjAi-WyZ8IJt3Al85l07HNY48m9nK-3w1yDIPYxoXNDTLVO88enk1JMqmvXrsbeyGHOLm3z5SwS8W7mCP22JO_A9dFDupGQ26MIE0quJhQ0MkgzAGVRpRjrgFqY4upi8_2j6VISgcVS6tG-do6TBZrv2fv6VKhn0njJ4Y2oc3ZxU4_nd4_2tsoAQS9LtZrOUbiF8xmNVSyUFZGF7JxpeW1JFpAtbUruQUC0sPGKfJ9vSKeDlIF3QV9frw4v8J7Roi1IoavKfRmzfNbWtiiu3S59GDgd_w5mP9k9H6f1ryz69Zgg

复制token填写至令牌处

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