K8S(06)web管理方式-dashboard

╰半橙微兮° 2022-11-29 12:54 148阅读 0赞

# K8S的web管理方式-dashboard #

\[TOC\]

dashboard是k8s的可视化管理平台，是三种管理k8s集群方法之一

## 1 部署dashboard ##

### 1.1 获取dashboard镜像 ###

获取镜像和创建资源配置清单的操作,还是老规矩:`7.200`上操作

#### 1.1.1 获取1.8.3版本的dsashboard ####

docker pull k8scn/kubernetes-dashboard-amd64:v1.8.3
    docker tag  k8scn/kubernetes-dashboard-amd64:v1.8.3 harbor.zq.com/public/dashboard:v1.8.3
    docker push harbor.zq.com/public/dashboard:v1.8.3

#### 1.1.2 获取1.10.1版本的dashboard ####

docker pull loveone/kubernetes-dashboard-amd64:v1.10.1
    docker tag  loveone/kubernetes-dashboard-amd64:v1.10.1 harbor.zq.com/public/dashboard:v1.10.1
    docker push harbor.zq.com/public/dashboard:v1.10.1

#### 1.1.3 为何要两个版本的dashbosrd ####

*  1.8.3版本授权不严格,方便学习使用
 *  1.10.1版本授权严格,学习使用麻烦,但生产需要

### 1.2 创建dashboard资源配置清单 ###

mkdir -p /data/k8s-yaml/dashboard

#### 1.2.1 创建rbca授权清单 ####

cat >/data/k8s-yaml/dashboard/rbac.yaml <<EOF
    apiVersion: v1
    kind: ServiceAccount
    metadata:
      labels:
        k8s-app: kubernetes-dashboard
        addonmanager.kubernetes.io/mode: Reconcile
      name: kubernetes-dashboard-admin
      namespace: kube-system
    ---
    apiVersion: rbac.authorization.k8s.io/v1
    kind: ClusterRoleBinding
    metadata:
      name: kubernetes-dashboard-admin
      namespace: kube-system
      labels:
        k8s-app: kubernetes-dashboard
        addonmanager.kubernetes.io/mode: Reconcile
    roleRef:
      apiGroup: rbac.authorization.k8s.io
      kind: ClusterRole
      name: cluster-admin
    subjects:
    - kind: ServiceAccount
      name: kubernetes-dashboard-admin
      namespace: kube-system
    EOF

#### 1.2.2 创建depoloy清单 ####

cat >/data/k8s-yaml/dashboard/dp.yaml <<EOF
    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: ''
        spec:
          priorityClassName: system-cluster-critical
          containers:
          - name: kubernetes-dashboard
            image: harbor.zq.com/public/dashboard: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: tmp-volume
              mountPath: /tmp
            livenessProbe:
              httpGet:
                scheme: HTTPS
                path: /
                port: 8443
              initialDelaySeconds: 30
              timeoutSeconds: 30
          volumes:
          - name: tmp-volume
            emptyDir: {}
          serviceAccountName: kubernetes-dashboard-admin
          tolerations:
          - key: "CriticalAddonsOnly"
            operator: "Exists"
    EOF

#### 1.2.3 创建service清单 ####

cat >/data/k8s-yaml/dashboard/svc.yaml <<EOF
    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:
      selector:
        k8s-app: kubernetes-dashboard
      ports:
      - port: 443
        targetPort: 8443
    EOF

\#\#\#\#1.2.4 创建ingress清单暴露服务

cat >/data/k8s-yaml/dashboard/ingress.yaml <<EOF
    apiVersion: extensions/v1beta1
    kind: Ingress
    metadata:
      name: kubernetes-dashboard
      namespace: kube-system
      annotations:
        kubernetes.io/ingress.class: traefik
    spec:
      rules:
      - host: dashboard.zq.com
        http:
          paths:
          - backend:
              serviceName: kubernetes-dashboard
              servicePort: 443
    EOF

### 1.3 创建相关资源 ###

#### 1.3.1 在任意node上创建 ####

kubectl create -f http://k8s-yaml.zq.com/dashboard/rbac.yaml
    kubectl create -f http://k8s-yaml.zq.com/dashboard/dp.yaml
    kubectl create -f http://k8s-yaml.zq.com/dashboard/svc.yaml
    kubectl create -f http://k8s-yaml.zq.com/dashboard/ingress.yaml

#### 1.3.2 添加域名解析 ####

vi /var/named/zq.com.zone
    dashboard          A    10.4.7.10
    # 注意前滚serial编号

systemctl restart named

#### 1.3.3 通过浏览器验证 ####

在本机浏览器上访问`http://dashboard.zq.com`,如果出来web界面,表示部署成功

可以看到安装1.8版本的dashboard，默认是可以跳过验证的：

![img][]

## 2 升级dashboard版本 ##

跳过登录是不科学的，因为我们在配置dashboard的rbac权限时，绑定的角色是system:admin，这个是集群管理员的角色，权限很大，如果任何人都可跳过登录直接使用,那你就等着背锅吧

### 2.1 把版本换成1.10以上版本 ###

在前面我们已经同时下载了1.10.1版本的docker镜像

#### 2.1.1 在线修改直接使用 ####

kubectl edit deploy kubernetes-dashboard -n kube-system

#### 2.2.2 等待滚动发布 ####

[root@hdss7-21 ~]# kubectl -n kube-system get pod|grep dashboard
    kubernetes-dashboard-5bccc5946b-vgk5n   1/1     Running       0          20s
    kubernetes-dashboard-b75bfb487-h7zft    0/1     Terminating   0          2m27s
    [root@hdss7-21 ~]# kubectl -n kube-system get pod|grep dashboard
    kubernetes-dashboard-5bccc5946b-vgk5n   1/1     Running   0          52s

#### 2.2.3 刷新dashboard页面： ####

![img][img 1]

可以看到这里原来的skip跳过已经没有了，我们如果想登陆，必须输入token，那我们如何获取token呢：

### 2.2 使用token登录 ###

#### 2.2.1 首先获取`secret`资源列表 ####

kubectl get secret  -n kube-system

![mark][]

#### 2.2.2 获取角色的详情 ####

列表中有很多角色,不同到角色有不同的权限,找到想要的角色`dashboard-admin`后,再用describe命令获取详情

kubectl -n kube-system describe secrets kubernetes-dashboard-admin-token-85gmd

![mark][mark 1]

找到详情中的token字段,就是我们需要用来登录的东西

拿到token去尝试登录,发现仍然登录不了,因为必须使用https登录,所以需要申请证书

#### 2.2.3 申请证书 ####

申请证书在`7.200`主机上

**创建json文件:**

cd /opt/certs/
    cat >/opt/certs/dashboard-csr.json <<EOF
    {
        "CN": "*.zq.com",
        "hosts": [
        ],
        "key": {
            "algo": "rsa",
            "size": 2048
        },
        "names": [
            {
                "C": "CN",
                "ST": "beijing",
                "L": "beijing",
                "O": "zq",
                "OU": "ops"
            }
        ]
    }
    EOF

**申请证书**

cfssl gencert -ca=ca.pem \
          -ca-key=ca-key.pem \
          -config=ca-config.json \
          -profile=server \
          dashboard-csr.json |cfssl-json -bare dashboard

**查看申请的证书**

[root@hdss7-200 certs]# ll |grep dash
    -rw-r--r-- 1 root root  993 May  4 12:08 dashboard.csr
    -rw-r--r-- 1 root root  280 May  4 12:08 dashboard-csr.json
    -rw------- 1 root root 1675 May  4 12:08 dashboard-key.pem
    -rw-r--r-- 1 root root 1359 May  4 12:08 dashboard.pem

#### 2.2.4 前端nginx服务部署证书 ####

在`7.11`,`7.12`两个前端代理上,都做相同操作

**拷贝证书:**

mkdir /etc/nginx/certs
    scp 10.4.7.200:/opt/certs/dashboard.pem /etc/nginx/certs
    scp 10.4.7.200:/opt/certs/dashboard-key.pem /etc/nginx/certs

**创建nginx配置**

cat >/etc/nginx/conf.d/dashboard.zq.com.conf <<'EOF'
    server {
        listen       80;
        server_name  dashboard.zq.com;
     rewrite ^(.*)$ https://${server_name}$1 permanent;

\}  
server \{  
listen 443 ssl;  
server\_name dashboard.zq.com;

ssl_certificate     "certs/dashboard.pem";
    ssl_certificate_key "certs/dashboard-key.pem";
    ssl_session_cache shared:SSL:1m;
    ssl_session_timeout  10m;
    ssl_ciphers HIGH:!aNULL:!MD5;
    ssl_prefer_server_ciphers on;
    
    location / {
        proxy_pass http://default_backend_traefik;
        proxy_set_header Host       $http_host;
        proxy_set_header x-forwarded-for $proxy_add_x_forwarded_for;
    }

\}  
EOF

**重启nginx服务**

nginx -t
    nginx -s reload

#### 2.2.5 再次登录dashboard ####

刷新页面后,再次使用前面的token登录,可以成功登录进去了

![img][img 2]

### 2.3 授权细则思考 ###

登录是登录了，但是我们要思考一个问题，我们使用rbac授权来访问dashboard,如何做到权限精细化呢？比如开发，只能看，不能摸，不同的项目组，看到的资源应该是不一样的，测试看到的应该是测试相关的资源。

[img]: /images/20221124/e75de1d1501242299df9b05e8905fc99.png
[img 1]: /images/20221124/929d7701825641c09763daf2b78223e1.png
[mark]: /images/20221124/a5bc1b1042ed4a6b9888368872ad9f0f.png
[mark 1]: /images/20221124/323a58f12d284485acdd537de1442d47.png
[img 2]: /images/20221124/884ccbd62cbf4407b72f7d39eaf833f3.png