Kubernetes web界面kubernetes-dashboard安装

本文讲述的是如何部署K8s的web UI,前提是已经有一个k8s集群后,按照如下步骤进行即可。(如下步骤都是在master节点上进行操作)

1、下载kubernetes-dashboard.yaml文件

2、修改kubernetes-dashboard.yaml文件

# ------------------- Dashboard Deployment ------------------- #

kind: Deployment
apiVersion: apps/v1beta2
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kube-system
spec:
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      k8s-app: kubernetes-dashboard
  template:
    metadata:
      labels:
        k8s-app: kubernetes-dashboard
    spec:
      containers:
      - name: kubernetes-dashboard
        image: registry.cn-hangzhou.aliyuncs.com/kube_containers/kubernetes-dashboard-amd64
        ports:
        - containerPort: 8443
          protocol: TCP
        args:
          - --auto-generate-certificates
# ------------------- Dashboard Service ------------------- #

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

上面代码红色字为kubernetes-dashboard.yaml文件中需要修改的地方,不然拉取不了镜像,以及使用Nodeport方式做映射,使其他主机能够访问该dashboard。

3、创建kubernetes-dashboard.yaml

kubectl create -f kubernetes-dashboard.yaml

4、查看kubernetes-dashboard容器是否已经运行

[root@docker-master1 ~]# kubectl get pods -n kube-system
NAME                                     READY   STATUS    RESTARTS   AGE
coredns-576cbf47c7-l5wlh                 1/1     Running   1          3d8h
coredns-576cbf47c7-zrl66                 1/1     Running   1          3d8h
etcd-docker-master1                      1/1     Running   1          3d8h
kube-apiserver-docker-master1            1/1     Running   2          3d8h
kube-controller-manager-docker-master1   1/1     Running   2          3d8h
kube-flannel-ds-amd64-c7wz6              1/1     Running   0          3d8h
kube-flannel-ds-amd64-hqvz9              1/1     Running   0          3d8h
kube-flannel-ds-amd64-w7n4s              1/1     Running   2          3d8h
kube-proxy-8gj2w                         1/1     Running   1          3d8h
kube-proxy-mt6dk                         1/1     Running   0          3d8h
kube-proxy-qtxz7                         1/1     Running   0          3d8h
kube-scheduler-docker-master1            1/1     Running   2          3d8h
kubernetes-dashboard-5f864b6c5f-5s2rw    1/1     Running   0          62m

如上红色字体已经显示kubernetes-dashboard已经成功在node节点上运行。当然,你也可以前往node节点上执行docker ps查看kubernetes-dashboard容器是否已经启动,netstat -ptln命令查看30001端口是否已经开放。

5、创建kubernetes-dashboard管理员角色

[root@docker-master1 ~]# vi 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

6、加载管理员角色

kubectl create -f k8s-admin.yaml

7、获取dashboard管理员角色token

#获取dashboard secret
kubectl get secret -n kube-system
[root@docker-master1 ~]# kubectl get secret -n kube-system
NAME                                             TYPE                                  DATA   AGE
attachdetach-controller-token-d9w8c              kubernetes.io/service-account-token   3      3d8h
bootstrap-signer-token-jdjwt                     kubernetes.io/service-account-token   3      3d8h
bootstrap-token-9n6rpz                           bootstrap.kubernetes.io/token         6      149m
bootstrap-token-n962df                           bootstrap.kubernetes.io/token         7      3d8h
certificate-controller-token-lktt8               kubernetes.io/service-account-token   3      3d8h
clusterrole-aggregation-controller-token-7stf6   kubernetes.io/service-account-token   3      3d8h
coredns-token-kbz5z                              kubernetes.io/service-account-token   3      3d8h
cronjob-controller-token-b647q                   kubernetes.io/service-account-token   3      3d8h
daemon-set-controller-token-tzlpk                kubernetes.io/service-account-token   3      3d8h
dashboard-admin-token-jc8t5                      kubernetes.io/service-account-token   3      17m
#获取token
[root@docker-master1 ~]# kubectl describe secret dashboard-admin-token-jc8t5 -n kube-system
Name:         dashboard-admin-token-jc8t5
Namespace:    kube-system
Labels:       <none>
Annotations:  kubernetes.io/service-account.name: dashboard-admin
              kubernetes.io/service-account.uid: cdfb442a-f48b-11e8-80e8-000c29c3dca5

Type:  kubernetes.io/service-account-token

Data
====
namespace:  11 bytes
token:      eyJhbGciOiJSUzI1NiIsImtpZCI6IiJ9.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.FZCsonMyEdcDDvbzIz7rMxm8vvlk0Ck6O5ooqzaJRWkggwMoqf92qYBsNxMxxT5BdAtxB_iPUD7rEagR7sLTqixHeC0HdTnGCcTnNU1fq2KJA5ssNyi9P4XGJqsGuf4mAmF5L56uBh43X4hQ41rFYPQwIrmVnknTAbAWf3biiKWkN9Az8NsCulRSSCsJSOwfPoGlo7aSbMYTyRXlmzLuLbkMpMvyMHChBJ_MIYbH9dBj_hL3L9iwo9gpNTfB-0_uYHPEPdQcib8qUkC5NxgXdBuQPug5y1kLUVFNgq45ozLTibZuVihK_gza-WKVpBRPY5PaYCN1Gu0-tFObUYDUow

8、使用管理员角色登陆kubernetes-dashboard web界面

客户端浏览器输入:https://nodeIP:nodeport ,也就是kubernetes-dashboard容器在哪台node节点上跑,以及上面设置的nodeport端口(我这里是https://192.168.20.214:30001)

出现如下界面,选择令牌——输入令牌,(令牌为上面的token)

 

 9、dashboard访问方式

根据官方文档,目前访问Dashboard有四种方式:

  • NodePort
  • API Server
  • kubectl proxy
  • Ingress

以上四种方式,我测试了前三种,目前只有NodePort和kubectl proxy可用,API Server暂时没有解决。

  1. 使用NodePort

   为kubernetes-dashboard.yaml添加Service后,就可以使用NodePort访问Dashboard。在我们的物理机上,使用Chrome访问https://192.168.20.214:30001/,如上2步骤。(2步骤使用的就是nodeport方式访问)

如访问提示了证书错误NET::ERR_CERT_INVALID,原因是由于物理机的浏览器证书不可用。我们可以生成一个私有证书或者使用公有证书,下面开始配置证书。

#1、查看kubernetes-dashboard 容器跑在哪台node节点上,这里跑在docker-slave2上
root@docker-master1 pki]# kubectl get pod -n kube-system -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE coredns-576cbf47c7-l5wlh 1/1 Running 1 9d 10.244.0.5 docker-master1 <none> coredns-576cbf47c7-zrl66 1/1 Running 1 9d 10.244.0.4 docker-master1 <none> etcd-docker-master1 1/1 Running 1 9d 192.168.20.210 docker-master1 <none> kube-apiserver-docker-master1 1/1 Running 2 9d 192.168.20.210 docker-master1 <none> kube-controller-manager-docker-master1 1/1 Running 2 9d 192.168.20.210 docker-master1 <none> kube-flannel-ds-amd64-c7wz6 1/1 Running 0 9d 192.168.20.213 docker-slave1 <none> kube-flannel-ds-amd64-hqvz9 1/1 Running 0 9d 192.168.20.214 docker-slave2 <none> kube-flannel-ds-amd64-w7n4s 1/1 Running 2 9d 192.168.20.210 docker-master1 <none> kube-proxy-8gj2w 1/1 Running 1 9d 192.168.20.210 docker-master1 <none> kube-proxy-mt6dk 1/1 Running 0 9d 192.168.20.213 docker-slave1 <none> kube-proxy-qtxz7 1/1 Running 0 9d 192.168.20.214 docker-slave2 <none> kube-scheduler-docker-master1 1/1 Running 2 9d 192.168.20.210 docker-master1 <none> kubernetes-dashboard-5f864b6c5f-5s2rw 1/1 Running 0 5d21h 10.244.3.9 docker-slave2 <none>
#2、在docker-slave2节点上查看kubernetes-dashboard容器ID
root@docker-slave2 ~]# docker ps | grep dashboard 384d9dc0170b registry.cn-hangzhou.aliyuncs.com/kube_containers/kubernetes-dashboard-amd64 "/dashboard --insecu…" 5 days ago Up 44 hours k8s_kubernetes-dashboard_kubernetes-dashboard-5f864b6c5f-5s2rw_kube-system_94c8c50b-f484-11e8-80e8-000c29c3dca5_0
#3、查看kubernetes-dashboard容器certs所挂载的宿主主机目录
[root@docker-slave2 ~]# docker inspect -f {{.Mounts}} 384d9dc0170b "Mounts": [ { "Type": "bind", "Source": "/var/lib/kubelet/pods/94c8c50b-f484-11e8-80e8-000c29c3dca5/volumes/kubernetes.io~empty-dir/tmp-volume", "Destination": "/tmp", "Mode": "", "RW": true, "Propagation": "rprivate" }, { "Type": "bind", "Source": "/var/lib/kubelet/pods/94c8c50b-f484-11e8-80e8-000c29c3dca5/volumes/kubernetes.io~secret/kubernetes-dashboard-token-tbctd", "Destination": "/var/run/secrets/kubernetes.io/serviceaccount", "Mode": "ro", "RW": false, "Propagation": "rprivate" }, { "Type": "bind", "Source": "/var/lib/kubelet/pods/94c8c50b-f484-11e8-80e8-000c29c3dca5/etc-hosts", "Destination": "/etc/hosts", "Mode": "", "RW": true, "Propagation": "rprivate" }, { "Type": "bind", "Source": "/var/lib/kubelet/pods/94c8c50b-f484-11e8-80e8-000c29c3dca5/containers/kubernetes-dashboard/0e84c511", "Destination": "/dev/termination-log", "Mode": "", "RW": true, "Propagation": "rprivate" }, { "Type": "bind", "Source": "/var/lib/kubelet/pods/94c8c50b-f484-11e8-80e8-000c29c3dca5/volumes/kubernetes.io~secret/kubernetes-dashboard-certs", "Destination": "/certs", "Mode": "ro", "RW": false, "Propagation": "rprivate" } ],
#4、这里以私有证书配置,生成dashboard证书
openssl genrsa -des3 -passout pass:x -out dashboard.pass.key 2048
openssl rsa -passin pass:x -in dashboard.pass.key -out dashboard.key
openssl req -new -key dashboard.key -out dashboard.csr
openssl x509 -req -sha256 -days 365 -in dashboard.csr -signkey dashboard.key -out dashboard.crt
#5、将生成的dashboard.crt  dashboard.key放到certs对应的宿主主机souce目录
scp dashboard.crt dashboard.key 192.168.20.214:/var/lib/kubelet/pods/94c8c50b-f484-11e8-80e8-000c29c3dca5/volumes/kubernetes.io~secret/kubernetes-dashboard-certs
#6、重启kubernetes-dashboard容器
docker restart 384d9dc0170b

完成以上步骤即可访问kubernetes-dashboard web了,由于使用的是私有证书,所以还是会弹出不安全的连接,需要添加例外。

        2、使用API Server

在我们的物理机上,使用Chrome访问地址:https://192.168.20.210:6443/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/,返回如下错误:

{
  "kind": "Status",
  "apiVersion": "v1",
  "metadata": {
    
  },
  "status": "Failure",
  "message": "services \"https:kubernetes-dashboard:\" is forbidden: User \"system:anonymous\" cannot get resource \"services/proxy\" in API group \"\" in the namespace \"kube-system\"",
  "reason": "Forbidden",
  "details": {
    "name": "https:kubernetes-dashboard:",
    "kind": "services"
  },
  "code": 403
}

原因是由于kube-apiserver使用了TLS认证,而我们的真实物理机上的浏览器使用匿名证书(因为没有可用的证书)去访问Dashboard,导致授权失败而不无法访问。官方提供的解决方法是将kubelet的证书转化为浏览器可用的证书,然后导入进浏览器。但是该方法目前似乎不适用于kubeadm方式安装的集群,参见:https://github.com/opsnull/follow-me-install-kubernetes-cluster/issues/5 。看来,无论物理机还是K8S节点上的浏览器,都需要导入这个证书,暂时无解。

        3、使用kubectl proxy

这里,我主要介绍一下最便捷的kubectl proxy方式。在Master上执行nohup kubecll proxy &,然后使用如下地址访问Dashboard:

http://localhost:8001/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy

但限制就是必须在Master上访问,这显然是个坑,我们的目标是在我们真实的物理机上去访问Master的Dashboard。

所以,在主节点上,我们执行nohup kubectl proxy --address=192.168.20.210 --disable-filter=true & 开启代理。

其中:

  • address表示外界可以使用192.168.20.210来访问Dashboard,我们也可以使用0.0.0.0
  • disable-filter=true表示禁用请求过滤功能,否则我们的请求会被拒绝,并提示 Forbidden (403) Unauthorized
  • 我们也可以指定端口,具体请查看kubectl proxy --help

此时proxy默认对Master的8001端口进行监听:

这样,我们就可以使用如下地址访问登录界面:

http://192.168.20.210:8001/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/#!/login

 

posted @ 2018-11-30 19:00  面对疾风  阅读(15410)  评论(1编辑  收藏  举报