免登录只读访问 kubernetes dashboard

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配置

基于 v2.7.0 的配置文件，修改了 ClusterRole 和 ClusterRoleBinding，使得 dashboard 只能以只读的方式访问 kubernetes 集群。

首先需要修改 dashboard 启动 args，移除 --auto-generate-certificates，添加 --enable-insecure-login 和 --enable-skip-login。

然后修改 Service 端口为 9090，并修改 Deployment 健康检查，根据权限修改 ClusterRole。

最后通过访问 kubernetes-dashboard.kubernetes-dashboard.svc.cluster.local:9090 即可。

完整配置

注意：以下配置中禁用了对 secret 的访问权限

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apiVersion: v1
kind: Namespace
metadata:
  name: kubernetes-dashboard

---

apiVersion: v1
kind: ServiceAccount
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard

---

apiVersion: v1
kind: Service
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
  ports:
    - port: 9090
      targetPort: 9090
  selector:
    k8s-app: kubernetes-dashboard

---

apiVersion: v1
kind: Secret
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard-certs
  namespace: kubernetes-dashboard
type: Opaque

---

apiVersion: v1
kind: Secret
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard-csrf
  namespace: kubernetes-dashboard
type: Opaque
data:
  csrf: ""

---

apiVersion: v1
kind: Secret
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard-key-holder
  namespace: kubernetes-dashboard
type: Opaque

---

apiVersion: v1
kind: ConfigMap
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard-settings
  namespace: kubernetes-dashboard

---

apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
rules:
  - apiGroups: [""]
    resources: ["secrets"]
    resourceNames: ["kubernetes-dashboard-key-holder", "kubernetes-dashboard-certs", "kubernetes-dashboard-csrf"]
    verbs: ["get", "update", "delete"]
  - apiGroups: [""]
    resources: ["configmaps"]
    resourceNames: ["kubernetes-dashboard-settings"]
    verbs: ["get", "update"]
  - apiGroups: [""]
    resources: ["services"]
    resourceNames: ["heapster", "dashboard-metrics-scraper"]
    verbs: ["proxy"]
  - apiGroups: [""]
    resources: ["services/proxy"]
    resourceNames: ["heapster", "http:heapster:", "https:heapster:", "dashboard-metrics-scraper", "http:dashboard-metrics-scraper"]
    verbs: ["get"]

---

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
rules:
  - apiGroups: [""]
    resources: ["configmaps", "endpoints", "persistentvolumes", "persistentvolumeclaims", "persistentvolumeclaims/status", "pods", "replicationcontrollers", "replicationcontrollers/scale", "serviceaccounts", "services", "services/status"]
    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", "nodes"]
    verbs: ["get", "list", "watch"]
  - apiGroups: ["apps"]
    resources: ["daemonsets", "daemonsets/status", "deployments", "deployments/scale", "deployments/status", "replicasets", "replicasets/scale", "replicasets/status", "statefulsets", "statefulsets/scale", "statefulsets/status"]
    verbs: ["get", "list", "watch"]
  - apiGroups: ["autoscaling"]
    resources: ["horizontalpodautoscalers", "horizontalpodautoscalers/status"]
    verbs: ["get", "list", "watch"]
  - apiGroups: ["batch"]
    resources: ["cronjobs", "cronjobs/status", "jobs", "jobs/status"]
    verbs: ["get", "list", "watch"]
  - apiGroups: ["extensions"]
    resources: ["daemonsets", "daemonsets/status", "deployments", "deployments/scale", "deployments/status", "ingresses", "ingresses/status", "networkpolicies", "replicasets", "replicasets/scale", "replicasets/status", "replicationcontrollers/scale"]
    verbs: ["get", "list", "watch"]
  - apiGroups: ["policy"]
    resources: ["poddisruptionbudgets", "poddisruptionbudgets/status"]
    verbs: ["get", "list", "watch"]
  - apiGroups: ["networking.k8s.io"]
    resources: ["networkpolicies", "ingresses", "ingresses/status", "ingressclasses"]
    verbs: ["get", "list", "watch"]
  - apiGroups: ["storage.k8s.io"]
    resources: ["storageclasses", "volumeattachments"]
    verbs: ["get", "list", "watch"]
  - apiGroups: ["metrics.k8s.io"]
    resources: ["pods", "nodes"]
    verbs: ["get", "list", "watch"]
  - apiGroups: ["rbac.authorization.k8s.io"]
    resources: ["clusterrolebindings", "clusterroles", "roles", "rolebindings"]
    verbs: ["get", "list", "watch"]
  - apiGroups: ["apiextensions.k8s.io"]
    resources: ["customresourcedefinitions"]
    verbs: ["get", "list", "watch"]
  - apiGroups: ["networking.istio.io"]
    resources: ["gateways", "envoyfilters", "virtualservices"]
    verbs: ["get", "list", "watch"]

---

apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: kubernetes-dashboard
subjects:
  - kind: ServiceAccount
    name: kubernetes-dashboard
    namespace: kubernetes-dashboard

---

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: kubernetes-dashboard
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: kubernetes-dashboard
subjects:
  - kind: ServiceAccount
    name: kubernetes-dashboard
    namespace: kubernetes-dashboard

---

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      k8s-app: kubernetes-dashboard
  template:
    metadata:
      labels:
        k8s-app: kubernetes-dashboard
    spec:
      securityContext:
        seccompProfile:
          type: RuntimeDefault
      containers:
        - name: kubernetes-dashboard
          image: kubernetesui/dashboard:v2.7.0
          imagePullPolicy: Always
          ports:
            - containerPort: 9090
              protocol: TCP
          args:
            - --namespace=kubernetes-dashboard
            - --enable-insecure-login
            - --enable-skip-login
          volumeMounts:
            - name: kubernetes-dashboard-certs
              mountPath: /certs
            - mountPath: /tmp
              name: tmp-volume
          livenessProbe:
            httpGet:
              scheme: HTTP
              path: /
              port: 9090
            initialDelaySeconds: 30
            timeoutSeconds: 30
          securityContext:
            allowPrivilegeEscalation: false
            readOnlyRootFilesystem: true
            runAsUser: 1001
            runAsGroup: 2001
      volumes:
        - name: kubernetes-dashboard-certs
          secret:
            secretName: kubernetes-dashboard-certs
        - name: tmp-volume
          emptyDir: {}
      serviceAccountName: kubernetes-dashboard
      nodeSelector:
        "kubernetes.io/os": linux
      tolerations:
        - key: node-role.kubernetes.io/master
          effect: NoSchedule

---

apiVersion: v1
kind: Service
metadata:
  labels:
    k8s-app: dashboard-metrics-scraper
  name: dashboard-metrics-scraper
  namespace: kubernetes-dashboard
spec:
  ports:
    - port: 8000
      targetPort: 8000
  selector:
    k8s-app: dashboard-metrics-scraper

---

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    k8s-app: dashboard-metrics-scraper
  name: dashboard-metrics-scraper
  namespace: kubernetes-dashboard
spec:
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      k8s-app: dashboard-metrics-scraper
  template:
    metadata:
      labels:
        k8s-app: dashboard-metrics-scraper
    spec:
      securityContext:
        seccompProfile:
          type: RuntimeDefault
      containers:
        - name: dashboard-metrics-scraper
          image: kubernetesui/metrics-scraper:v1.0.8
          ports:
            - containerPort: 8000
              protocol: TCP
          livenessProbe:
            httpGet:
              scheme: HTTP
              path: /
              port: 8000
            initialDelaySeconds: 30
            timeoutSeconds: 30
          volumeMounts:
          - mountPath: /tmp
            name: tmp-volume
          securityContext:
            allowPrivilegeEscalation: false
            readOnlyRootFilesystem: true
            runAsUser: 1001
            runAsGroup: 2001
      serviceAccountName: kubernetes-dashboard
      nodeSelector:
        "kubernetes.io/os": linux
      tolerations:
        - key: node-role.kubernetes.io/master
          effect: NoSchedule
      volumes:
        - name: tmp-volume
          emptyDir: {}

Ref

  • https://github.com/kubernetes/dashboard/tree/v2.7.0
  • https://github.com/kubernetes/dashboard/blob/v2.7.0/docs/common/dashboard-arguments.md
  • https://gist.github.com/karthik101/201374aee2ebea25ddf6c723858568be