K8S dashboard 创建只读账户

1.创建名字为“Dashboard-viewonly“的Cluster Role，各种资源只给予了list，get，watch的权限。dashboard-viewonly.yaml

---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: dashboard-viewonly
rules:
- apiGroups:
  - ""
  resources:
  - configmaps
  - endpoints
  - persistentvolumeclaims
  - pods
  - replicationcontrollers
  - replicationcontrollers/scale
  - serviceaccounts
  - services
  - nodes
  - persistentvolumeclaims
  - persistentvolumes
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - ""
  resources:
  - bindings
  - events
  - limitranges
  - namespaces/status
  - pods/log
  - pods/status
  - replicationcontrollers/status
  - resourcequotas
  - resourcequotas/status
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - ""
  resources:
  - namespaces
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - apps
  resources:
  - daemonsets
  - deployments
  - deployments/scale
  - replicasets
  - replicasets/scale
  - statefulsets
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - autoscaling
  resources:
  - horizontalpodautoscalers
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - batch
  resources:
  - cronjobs
  - jobs
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - extensions
  resources:
  - daemonsets
  - deployments
  - deployments/scale
  - ingresses
  - networkpolicies
  - replicasets
  - replicasets/scale
  - replicationcontrollers/scale
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - policy
  resources:
  - poddisruptionbudgets
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - networking.k8s.io
  resources:
  - networkpolicies
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - storage.k8s.io
  resources:
  - storageclasses
  - volumeattachments
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - rbac.authorization.k8s.io
  resources:
  - clusterrolebindings
  - clusterroles
  - roles
  - rolebindings
  verbs:
  - get
  - list
  - watch

2.创建名字为vss-read的service account，并且绑定这个sa到dashboard-viewonly这个clusterRole。vss-read.yaml

---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
  name: vss-read
  labels: 
    k8s-app: vss-read
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: dashboard-viewonly
subjects:
- kind: ServiceAccount
  name: vss-read
  namespace: kube-system

3. 查看现有dashboard的配置

$ kubectl get pods -n kube-system |grep dashboard
kubernetes-dashboard-6c664cf6c5-gfckr                                 1/1       Running   1          20d
$ kubectl describe svc kubernetes-dashboard -n kube-system
Name:              kubernetes-dashboard
Namespace:         kube-system
Labels:            k8s-app=kubernetes-dashboard
Annotations:       kubectl.kubernetes.io/last-applied-configuration={"apiVersion":"v1","kind":"Service","metadata":{"annotations":{},"labels":{"k8s-app":"kubernetes-dashboard"},"name":"kubernetes-dashboard","namespace":...
Selector:          k8s-app=kubernetes-dashboard
Type:              ClusterIP
IP:                100.71.200.102
Port:              <unset>  443/TCP
TargetPort:        8443/TCP
Endpoints:         100.98.177.79:8443
Session Affinity:  None
Events:            <none>$ kubectl get service -n kube-system -o wide
NAME                                                   TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)         AGE       SELECTOR
cluster-autoscaler-2018-11-16-aws-cluster-autoscaler   ClusterIP   100.68.131.0     <none>        8085/TCP        47d       app=aws-cluster-autoscaler,release=cluster-autoscaler-2018-11-16
kube-dns                                               ClusterIP   100.64.0.10      <none>        53/UDP,53/TCP   227d      k8s-app=kube-dns
kube-state-metrics                                     ClusterIP   100.70.246.130   <none>        8080/TCP        181d      app=kube-state-metrics,release=kube-state-metrics
kubernetes-dashboard                                   ClusterIP   100.71.200.102   <none>        443/TCP         112d      k8s-app=kubernetes-dashboard
metrics-server                                         ClusterIP   100.67.89.201    <none>        443/TCP         167d      k8s-app=metrics-server
tiller-deploy                                          ClusterIP   100.65.225.136   <none>        44134/TCP       227d      app=helm,name=tiller
$ kubectl get service -n kube-system -o wide |grep dashboard
kubernetes-dashboard                                   ClusterIP   100.71.200.102   <none>        443/TCP         112d      k8s-app=kubernetes-dashboard

4.应用这两个yaml文件到K8S集群环境中

$ kubectl apply -f dashboard-viewonly.yaml
$ kubectl apply -f vss-read.yaml

5.查看vss-read用户的token全名

$ kubectl describe serviceaccount vss-read -n kube-system
Name:         vss-read
Namespace:    kube-system
Labels:       <none>
Annotations:  kubectl.kubernetes.io/last-applied-configuration={"apiVersion":"v1","kind":"ServiceAccount","metadata":{"annotations":{},"name":"vss-read","namespace":"kube-system"}}

Image pull secrets:  <none>
Mountable secrets:   vss-read-token-zs89w
Tokens:              vss-read-token-zs89w
Events:              <none>

6.查看token值

$ kubectl describe secret vss-read-token-zs89w -n kube-system
Name:         vss-read-token-zs89w
Namespace:    kube-system
Labels:       <none>
Annotations:  kubernetes.io/service-account.name=vss-read
              kubernetes.io/service-account.uid=f7b82f23-0e83-11e9-8b41-02351c31ffae

Type:  kubernetes.io/service-account-token

Data
====
ca.crt:     1042 bytes
namespace:  11 bytes
token:      eyJhbGciOiJSUzI1NiIsImtpZCI6IiJ9.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

7.通过这个token值来登录K8S，dashboard 

参考：

https://www.cnblogs.com/fengzhihai/p/9851470.html

https://www.cnblogs.com/linuxk/p/9783510.html