[系统运维]5.kubernetes的GUI资源管理插件-仪表盘

1.kubernetes的GUI资源管理插件-仪表盘

hdss7-200上下载dashboard镜像

[root@hdss7-200 ~]# docker pull k8scn/kubernetes-dashboard-amd64:v1.8.3
[root@hdss7-200 ~]# docker images|grep dashboard
[root@hdss7-200 ~]# docker tag fcac9aa03fd6  harbor.od.com/public/dashboard:v1.8.3
[root@hdss7-200 ~]# docker push harbor.od.com/public/dashboard:v1.8.3

在hdss7-200.host.com上创建资源配置清单

[root@hdss7-200 ~]# mkdir -p /data/k8s-yaml/dashboard && cd /data/k8s-yaml/dashboard

rbac.yaml

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

dp.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: ''
    spec:
      priorityClassName: system-cluster-critical
      containers:
      - name: kubernetes-dashboard
        image: harbor.od.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"

svc.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:
  selector:
    k8s-app: kubernetes-dashboard
  ports:
  - port: 443
    targetPort: 8443

ingress.yaml

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: kubernetes-dashboard
  namespace: kube-system
  annotations:
    kubernetes.io/ingress.class: traefik
spec:
  rules:
  - host: dashboard.od.com
    http:
      paths:
      - backend:
          serviceName: kubernetes-dashboard
          servicePort: 443 

hdss7-21上应用资源配置清单

[root@hdss7-21 containers]# kubectl apply -f http://k8s-yaml.od.com/dashboard/rbac.yaml
[root@hdss7-21 containers]# kubectl apply -f http://k8s-yaml.od.com/dashboard/dp.yaml
[root@hdss7-21 containers]# kubectl apply -f http://k8s-yaml.od.com/dashboard/svc.yaml
[root@hdss7-21 containers]# kubectl apply -f http://k8s-yaml.od.com/dashboard/ingress.yaml

查看创建的资源

[root@hdss7-21 containers]# kubectl get pods -n kube-system
[root@hdss7-21 containers]# kubectl get svc -n kube-system
[root@hdss7-21 containers]# kubectl get ingress -n kube-system

出现CrashLoopBackOff
kubernetes(k8s)创建Dashboard失败，Dashboard的pod状态为CrashLoopBackOff 解决方法
解析域名

[root@hdss7-11 ~]# cat /var/named/od.com.zone
$ORIGIN od.com.
$TTL 600	; 10 minutes
@   		IN SOA	dns.od.com. dnsadmin.od.com. (
				2021123105 ; serial
				10800      ; refresh (3 hours)
				900        ; retry (15 minutes)
				604800     ; expire (1 week)
				86400      ; minimum (1 day)
				)
				NS   dns.od.com.
$TTL 60	; 1 minute
dns                A    10.4.7.11
harbor             A    10.4.7.200
k8s-yaml           A    10.4.7.200
traefik            A    10.4.7.10
dashboard          A    10.4.7.10

浏览器访问

http://dashboard.od.com/

hdss7-200上执行生成dashboard证书

[root@hdss7-200 ~]# cd /opt/certs/
[root@hdss7-200 certs]# (umask 077 openssl genrsa -out dashboard.od.com 2018)
[root@hdss7-200 certs]# openssl req -new -key dashboard.od.com.key -out dashboard.od.com.csr -subj "/CN=dashboard.od.com/C=CN/ST=GD/L=GuangDong/O=Heroge/OU=ops"
[root@hdss7-200 certs]# openssl x509 -req -in dashboard.od.com.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out dashboard.od.com -days 3650

将生成的dashboard证书复制相对应的主机
分别在11和12上执行

~]# mkdir -p /etc/nginx/certs
~]# cd /etc/nginx/certs/
certs]# scp -r root@hdss7-200:/opt/certs/dashboard.od.com.crt .
certs]# scp -r root@hdss7-200:/opt/certs/dashboard.od.com.key .

为域名提供nginx的证书配置文件
分别在11、12执行如下命令

~]# vim /etc/nginx/conf.d/dashboard.od.com.conf
server {
    listen       80;
    server_name  dashboard.od.com;

    rewrite ^(.*)\$ https://\${server_name}\$1 permanent;
}
server {
    listen       443 ssl;
    server_name  dashboard.od.com;

    ssl_certificate "certs/dashboard.od.com.crt";
    ssl_certificate_key "certs/dashboard.od.com.key";
    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;
    }
}

分别重启11和12的nginx服务

~]# nginx -t
~]# nginx -s reload 

访问域名dashboard.od.com
查看dashboard的token
令牌命令行获取方式

kubernetes-dashboard的pod镜像成功运行后，会由kuberneter-dashboard-admin服务帐号自动生成secret，查看secret得到token就可以登录
一个服务帐号，它一定会对应着一个惟一的有服务帐号的secret
在master节点(21、22)任意一台执行

[root@hdss7-21 ~]# kubectl get secret -n kube-system
[root@hdss7-21 ~]# kubectl describe secret kubernetes-dashboard-admin-token-94gf4 -n kube-system

使用查询到的token登录dashboard