1.dashboard概述

在 Kubernetes 社区中，有一个很受欢迎的 Dashboard 项目，它可以给用户提供一个可视化的 Web 界面来查看当前集群的各种信息。用户可以用 Kubernetes Dashboard 部署容器化的应用、监控应用的状态、执行故障排查任务以及管理 Kubernetes 各种资源。

2.部署dashboard实验

1.实验环境

多节点k8s，master01，node01，node02

2. 实验目的

通过搭建的dashboard来通过web界面直观显示参数

3.实验步骤

1.master01

[root@master01 ~]# kubectl get nodes
NAME              STATUS   ROLES    AGE   VERSION
192.168.200.110   Ready    <none>   13h   v1.12.3
192.168.200.120   Ready    <none>   13h   v1.12.3
[root@master01 ~]# cd k8s/
[root@master01 k8s]# mkdir dashboard
[root@master01 k8s]# cd dashboard/
[root@master01 dashboard]# ls
[root@master01 dashboard]# rz -E
rz waiting to receive.
[root@master01 dashboard]# ls
dashboard-configmap.yaml   dashboard-rbac.yaml    dashboard-service.yaml
dashboard-controller.yaml  dashboard-secret.yaml  k8s-admin.yaml

2.查看各文件内容

[root@master01 dashboard]# vim dashboard-rbac.yaml 
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
    addonmanager.kubernetes.io/mode: Reconcile
  name: kubernetes-dashboard-minimal
  namespace: kube-system
rules:
  # Allow Dashboard to get, update and delete Dashboard exclusive secrets.
- apiGroups: [""]
  resources: ["secrets"]
  resourceNames: ["kubernetes-dashboard-key-holder", "kubernetes-dashboard-certs"]
  verbs: ["get", "update", "delete"]
  # Allow Dashboard to get and update 'kubernetes-dashboard-settings' config map.
- apiGroups: [""]
  resources: ["configmaps"]
  resourceNames: ["kubernetes-dashboard-settings"]
  verbs: ["get", "update"]
  # Allow Dashboard to get metrics from heapster.
- apiGroups: [""]
  resources: ["services"]
  resourceNames: ["heapster"]
  verbs: ["proxy"]
- apiGroups: [""]
  resources: ["services/proxy"]
  resourceNames: ["heapster", "http:heapster:", "https:heapster:"]
  verbs: ["get"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: kubernetes-dashboard-minimal
  namespace: kube-system
  labels:
    k8s-app: kubernetes-dashboard
    addonmanager.kubernetes.io/mode: Reconcile
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: kubernetes-dashboard-minimal
subjects:
- kind: ServiceAccount
  name: kubernetes-dashboard
  namespace: kube-system
[root@master01 dashboard]# vim dashboard-secret.yaml 
apiVersion: v1
kind: Secret
metadata:
  labels:
    k8s-app: kubernetes-dashboard
    # Allows editing resource and makes sure it is created first.
    addonmanager.kubernetes.io/mode: EnsureExists
  name: kubernetes-dashboard-certs
  namespace: kube-system
type: Opaque
---
apiVersion: v1
kind: Secret
metadata:
  labels:
    k8s-app: kubernetes-dashboard
    # Allows editing resource and makes sure it is created first.
    addonmanager.kubernetes.io/mode: EnsureExists
  name: kubernetes-dashboard-key-holder
  namespace: kube-system
type: Opaque
[root@master01 dashboard]# vim dashboard-configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  labels:
    k8s-app: kubernetes-dashboard
    # Allows editing resource and makes sure it is created first.
    addonmanager.kubernetes.io/mode: EnsureExists
  name: kubernetes-dashboard-settings
  namespace: kube-system
[root@master01 dashboard]# vim dashboard-controller.yaml 
apiVersion: apps/v1
kind: Deployment
metadata:
  name: kubernetes-dashboard
  namespace: kube-system
  labels:
    k8s-app: kubernetes-dashboard
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
spec:
  selector:
    matchLabels:
      k8s-app: kubernetes-dashboard
  template:
    metadata:
      labels:
        k8s-app: kubernetes-dashboard
      annotations:
        scheduler.alpha.kubernetes.io/critical-pod: ''
        seccomp.security.alpha.kubernetes.io/pod: 'docker/default'
    spec:
      priorityClassName: system-cluster-critical
      containers:
      - name: kubernetes-dashboard
        image: siriuszg/kubernetes-dashboard-amd64:v1.8.3
        resources:
          limits:
            cpu: 100m
            memory: 300Mi
          requests:
            cpu: 50m
            memory: 100Mi
        ports:
        - containerPort: 8443
          protocol: TCP
        args:
          # PLATFORM-SPECIFIC ARGS HERE
          - --auto-generate-certificates
        volumeMounts:
        - name: kubernetes-dashboard-certs
          mountPath: /certs
        - name: tmp-volume
          mountPath: /tmp
        livenessProbe:
          httpGet:
            scheme: HTTPS
            path: /
            port: 8443
          initialDelaySeconds: 30
          timeoutSeconds: 30
      volumes:
      - name: kubernetes-dashboard-certs
        secret:
          secretName: kubernetes-dashboard-certs
      - name: tmp-volume
        emptyDir: {}
      serviceAccountName: kubernetes-dashboard
      tolerations:
      - key: "CriticalAddonsOnly"
        operator: "Exists"
[root@master01 dashboard]# vim dashboard-service.yaml 
apiVersion: v1
kind: Service
metadata:
  name: kubernetes-dashboard
  namespace: kube-system
  labels:
    k8s-app: kubernetes-dashboard
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
spec:
  type: NodePort
  selector:
    k8s-app: kubernetes-dashboard
  ports:
  - port: 443
    targetPort: 8443
    nodePort: 30001
[root@master01 dashboard]# vim k8s-admin.yaml 
apiVersion: v1
kind: ServiceAccount
metadata:
  name: dashboard-admin
  namespace: kube-system
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: dashboard-admin
subjects:
  - kind: ServiceAccount
    name: dashboard-admin
    namespace: kube-system
roleRef:
  kind: ClusterRole
  name: cluster-admin
  apiGroup: rbac.authorization.k8s.io

3.通过yaml文件创建资源

[root@master01 dashboard]# kubectl create -f dashboard-rbac.yaml    #授权管理创建资源
role.rbac.authorization.k8s.io/kubernetes-dashboard-minimal created
rolebinding.rbac.authorization.k8s.io/kubernetes-dashboard-minimal created
[root@master01 dashboard]# kubectl create -f dashboard-secret.yaml  #证书验证创建资源
secret/kubernetes-dashboard-certs created
secret/kubernetes-dashboard-key-holder created
[root@master01 dashboard]# kubectl create -f dashboard-configmap.yaml  #配置文件创建资源
configmap/kubernetes-dashboard-settings created
[root@master01 dashboard]# kubectl create -f dashboard-controller.yaml #控制创建资源
serviceaccount/kubernetes-dashboard created
deployment.apps/kubernetes-dashboard created
[root@master01 dashboard]# kubectl create -f dashboard-service.yaml #服务创建服务资源
service/kubernetes-dashboard created

4.查看资源

[root@master01 dashboard]# kubectl get pods -n kube-system   #完成后查看创建在指定的kube-system命名空间下
NAME                                    READY   STATUS    RESTARTS   AGE
kubernetes-dashboard-7dffbccd68-n4hgt   1/1     Running   0          3h23m   #查看如何访问
[root@master01 dashboard]# kubectl get pods,svc -n kube-system    #同时查看pods和service
NAME                                        READY   STATUS    RESTARTS   AGE
pod/kubernetes-dashboard-7dffbccd68-n4hgt   1/1     Running   0          3h23m

NAME                           TYPE       CLUSTER-IP   EXTERNAL-IP   PORT(S)         AGE
service/kubernetes-dashboard   NodePort   10.0.0.238   <none>        443:30001/TCP   3h28m
[root@master01 dashboard]# kubectl get pods -n kube-system -o wide     #查看创建在哪个节点
NAME                                    READY   STATUS    RESTARTS   AGE     IP           NODE              NOMINATED NODE
kubernetes-dashboard-7dffbccd68-n4hgt   1/1     Running   0          3h23m   172.17.4.2   192.168.200.120   <none>

使用谷歌浏览器访问https://192.168.200.120:30001/

谷歌浏览器无法访问的问题

[root@localhost dashboard]# vim dashboard-cert.sh
cat > dashboard-csr.json <<EOF
{
   "CN": "Dashboard",
   "hosts": [],
   "key": {
       "algo": "rsa",
       "size": 2048
   },
   "names": [
       {
           "C": "CN",
           "L": "BeiJing",
           "ST": "BeiJing"
       }
   ]
}
EOF

K8S_CA=$1
cfssl gencert -ca=$K8S_CA/ca.pem -ca-key=$K8S_CA/ca-key.pem -config=$K8S_CA/ca-config.json -profile=kubernetes dashboard-csr.json | cfssljson -bare dashboard
kubectl delete secret kubernetes-dashboard-certs -n kube-system
kubectl create secret generic kubernetes-dashboard-certs --from-file=./ -n kube-system

dashboard-controller.yaml 增加证书两行
[root@localhost dashboard]# vim dashboard-controller.yaml
args:
          # PLATFORM-SPECIFIC ARGS HERE
          - --auto-generate-certificates
          - --tls-key-file=dashboard-key.pem   ###
          - --tls-cert-file=dashboard.pem       ###

[root@localhost dashboard]# bash dashboard-cert.sh /root/k8s/k8s-cert/
2020/10/05 15:29:08 [INFO] generate received request
2020/10/05 15:29:08 [INFO] received CSR
2020/10/05 15:29:08 [INFO] generating key: rsa-2048
2020/10/05 15:29:09 [INFO] encoded CSR
2020/10/05 15:29:09 [INFO] signed certificate with serial number 150066859036029062260457207091479364937405390263
2020/10/05 15:29:09 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").
secret "kubernetes-dashboard-certs" deleted
secret/kubernetes-dashboard-certs created

重新部署

[root@localhost dashboard]# kubectl apply -f dashboard-controller.yaml 
Warning: kubectl apply should be used on resource created by either kubectl create --save-config or kubectl apply
serviceaccount/kubernetes-dashboard configured
Warning: kubectl apply should be used on resource created by either kubectl create --save-config or kubectl apply
deployment.apps/kubernetes-dashboard configured

生成令牌

[root@localhost dashboard]# kubectl create -f k8s-admin.yaml 
serviceaccount/dashboard-admin created
clusterrolebinding.rbac.authorization.k8s.io/dashboard-admin created

保存

[root@master01 dashboard]# kubectl get secret -n kube-system
NAME                               TYPE                                  DATA   AGE
dashboard-admin-token-q88zn        kubernetes.io/service-account-token   3      4h7m
default-token-d2l4p                kubernetes.io/service-account-token   3      20h
kubernetes-dashboard-certs         Opaque                                11     3h42m
kubernetes-dashboard-key-holder    Opaque                                2      3h45m
kubernetes-dashboard-token-l722w   kubernetes.io/service-account-token   3      3h40m

查看令牌

[root@master01 dashboard]# kubectl describe secret dashboard-admin-token-q88zn -n kube-system 
Name:         dashboard-admin-token-q88zn
Namespace:    kube-system
Labels:       <none>
Annotations:  kubernetes.io/service-account.name: dashboard-admin
              kubernetes.io/service-account.uid: 333fffd2-0954-11eb-b56a-000c296df6f1

Type:  kubernetes.io/service-account-token

Data
====
token:      eyJhbGciOiJSUzI1NiIsImtpZCI6IiJ9.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.AMUqiDTTZjJWmkUK72hh59XqyzBt_wGc_h7w9zOadtBLZQM21UDjNaowAuJlbjapKv0M63KjGk9Tv_UDPvQiFICNtu-JcVAokCpuB92xv-kED_pgbHCMLLyF8o2m0DPuZ6Ph6evpdX3mDEL7aNZ-wNBrlbLqJPKquEaBS0fb3UNLfkMNMznPNjFBuWe36ekxbXlBRZhCq0REz74q-MAa-2IwE2qxlUTyJOp3sccgivc6LafHZG0lUagLDqAxc9jdK5g2VYnXJHLSeZLUgcFStTllVTBKdl4wUHpfz_hssOjrivLZOZRr_aeRyKYDjG3r94q0C1eDOGL38pNpiSWdTQ
ca.crt:     1359 bytes
namespace:  11 bytes

输入令牌秘钥

eyJhbGciOiJSUzI1NiIsImtpZCI6IiJ9.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.AMUqiDTTZjJWmkUK72hh59XqyzBt_wGc_h7w9zOadtBLZQM21UDjNaowAuJlbjapKv0M63KjGk9Tv_UDPvQiFICNtu-JcVAokCpuB92xv-kED_pgbHCMLLyF8o2m0DPuZ6Ph6evpdX3mDEL7aNZ-wNBrlbLqJPKquEaBS0fb3UNLfkMNMznPNjFBuWe36ekxbXlBRZhCq0REz74q-MAa-2IwE2qxlUTyJOp3sccgivc6LafHZG0lUagLDqAxc9jdK5g2VYnXJHLSeZLUgcFStTllVTBKdl4wUHpfz_hssOjrivLZOZRr_aeRyKYDjG3r94q0C1eDOGL38pNpiSWdTQ