Kubernetes Dashboard v1.7.1 Refactor

This version required changing the previous access model for dashboard completely but it's a change for the better. Docs were updated. * New login/auth options that use apiserver auth proxying by default * Requires RBAC in `authorization_modes` * Only serves over https * No longer available at https://first_master:6443/ui until apiserver is updated with the https proxy URL: * Can access from https://first_master:6443/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/#!/login you will be prompted for credentials * Or you can run 'kubectl proxy' from your local machine to access dashboard in your browser from: http://localhost:8001/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/ * It is recommended to access dashboard from behind a gateway that enforces an authentication token, details and other access options here: https://github.com/kubernetes/dashboard/wiki/Accessing-Dashboard---1.7.X-and-above
2017-11-09 15:59:30 -06:00 · 2017-11-09 15:59:30 -06:00 · 0c6f172e75
parent f9b68a5d17
commit 0c6f172e75
6 changed files with 142 additions and 32 deletions
--- a/docs/getting-started.md
+++ b/docs/getting-started.md
@ -93,18 +93,19 @@ the Kubernetes [documentation](https://kubernetes.io/docs/tasks/access-applicati
 Accessing Kubernetes Dashboard
 ------------------------------

-If the variable `dashboard_enabled` is set (default is true) as well as
-kube_basic_auth (default is false), then you can
-access the Kubernetes Dashboard at the following URL:
+As of kubernetes-dashboard v1.7.x:
+* New login options that use apiserver auth proxying of token/basic/kubeconfig by default
+* Requires RBAC in authorization_modes
+* Only serves over https
+* No longer available at https://first_master:6443/ui until apiserver is updated with the https proxy URL

-  https://kube:_kube-password_@_host_:6443/ui/
+If the variable `dashboard_enabled` is set (default is true), then you can access the Kubernetes Dashboard at the following URL, You will be prompted for credentials:
+https://first_master:6443/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/#!/login

-To see the password, refer to the section above, titled *Connecting to
-Kubernetes*. The host can be any kube-master or kube-node or loadbalancer
-(when enabled).
+Or you can run 'kubectl proxy' from your local machine to access dashboard in your browser from:
+http://localhost:8001/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/#!/login

-To access the Dashboard with basic auth disabled, follow the instructions here:
-https://kubernetes.io/docs/tasks/access-application-cluster/web-ui-dashboard/#command-line-proxy
+It is recommended to access dashboard from behind a gateway (like Ingress Controller) that enforces an authentication token. Details and other access options here: https://github.com/kubernetes/dashboard/wiki/Accessing-Dashboard---1.7.X-and-above

 Accessing Kubernetes API
 ------------------------
--- a/inventory/group_vars/k8s-cluster.yml
+++ b/inventory/group_vars/k8s-cluster.yml
@ -143,7 +143,8 @@ helm_deployment_type: docker
 # K8s image pull policy (imagePullPolicy)
 k8s_image_pull_policy: IfNotPresent

-# Kubernetes dashboard (available at http://first_master:6443/ui by default)
+# Kubernetes dashboard
+# RBAC required. see docs/getting-started.md for access details.
 dashboard_enabled: true

 # Monitoring apps for k8s
--- a/roles/kubernetes-apps/ansible/defaults/main.yml
+++ b/roles/kubernetes-apps/ansible/defaults/main.yml
@ -41,7 +41,9 @@ netchecker_server_memory_requests: 64M
 # Dashboard
 dashboard_enabled: false
 dashboard_image_repo: gcr.io/google_containers/kubernetes-dashboard-amd64
-dashboard_image_tag: v1.6.3
+dashboard_image_tag: v1.7.1
+dashboard_init_image_repo: gcr.io/google_containers/kubernetes-dashboard-init-amd64
+dashboard_init_image_tag: v1.0.1

 # Limits for dashboard
 dashboard_cpu_limit: 100m
--- a/roles/kubernetes-apps/ansible/tasks/dashboard.yml
+++ b/roles/kubernetes-apps/ansible/tasks/dashboard.yml
@ -1,10 +1,20 @@
 ---
+- name: Kubernetes Apps | Delete old kubernetes-dashboard resources
+  kube:
+    name: "kubernetes-dashboard"
+    kubectl: "{{bin_dir}}/kubectl"
+    resource: "{{ item }}"
+    state: absent
+  with_items: ['ClusterRoleBinding']
+  tags:
+    - upgrade
+
 - name: Kubernetes Apps | Lay down dashboard template
  template:
    src: "{{item.file}}"
    dest: "{{kube_config_dir}}/{{item.file}}"
  with_items:
-    - {file: dashboard.yml.j2, type: deploy, name: netchecker-agent}
+    - {file: dashboard.yml.j2, type: deploy, name: kubernetes-dashboard}
  register: manifests
  when: inventory_hostname == groups['kube-master'][0]

--- a/roles/kubernetes-apps/ansible/templates/dashboard.yml.j2
+++ b/roles/kubernetes-apps/ansible/templates/dashboard.yml.j2
@ -1,4 +1,4 @@
-# Copyright 2015 Google Inc. All Rights Reserved.
+# Copyright 2017 The Kubernetes Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@ -12,12 +12,25 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.

-# Configuration to deploy head version of the Dashboard UI compatible with
-# Kubernetes 1.6 (RBAC enabled).
+# Configuration to deploy release version of the Dashboard UI compatible with
+# Kubernetes 1.7.
 #
 # Example usage: kubectl create -f <this_file>

-{% if rbac_enabled %}
+# ------------------- Dashboard Secret ------------------- #
+
+apiVersion: v1
+kind: Secret
+metadata:
+  labels:
+    k8s-app: kubernetes-dashboard
+  name: kubernetes-dashboard-certs
+  namespace: {{ system_namespace }}
+type: Opaque
+
+---
+# ------------------- Dashboard Service Account ------------------- #
+
 apiVersion: v1
 kind: ServiceAccount
 metadata:
@ -25,23 +38,77 @@ metadata:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: {{ system_namespace }}
+
+---
+# ------------------- Dashboard Role & Role Binding ------------------- #
+
+kind: Role
+apiVersion: rbac.authorization.k8s.io/v1beta1
+metadata:
+  name: kubernetes-dashboard-minimal
+  namespace: {{ system_namespace }}
+rules:
+  # Allow Dashboard to create and watch for changes of 'kubernetes-dashboard-key-holder' secret.
+- apiGroups: [""]
+  resources: ["secrets"]
+  verbs: ["create", "watch"]
+- apiGroups: [""]
+  resources: ["secrets"]
+  # Allow Dashboard to get, update and delete 'kubernetes-dashboard-key-holder' secret.
+  resourceNames: ["kubernetes-dashboard-key-holder", "kubernetes-dashboard-certs"]
+  verbs: ["get", "update", "delete"]
+  # Allow Dashboard to get metrics from heapster.
+- apiGroups: [""]
+  resources: ["services"]
+  resourceNames: ["heapster"]
+  verbs: ["proxy"]
+
 ---
 apiVersion: rbac.authorization.k8s.io/v1beta1
-kind: ClusterRoleBinding
+kind: RoleBinding
 metadata:
-  name: kubernetes-dashboard
-  labels:
-    k8s-app: kubernetes-dashboard
+  name: kubernetes-dashboard-minimal
+  namespace: {{ system_namespace }}
 roleRef:
  apiGroup: rbac.authorization.k8s.io
-  kind: ClusterRole
-  name: cluster-admin
+  kind: Role
+  name: kubernetes-dashboard-minimal
 subjects:
 - kind: ServiceAccount
  name: kubernetes-dashboard
  namespace: {{ system_namespace }}
-{% endif %}
+
 ---
+# ------------------- Gross Hack For anonymous auth through api proxy ------------------- #
+# Allows users to reach login page and other proxied dashboard URLs
+kind: ClusterRole
+apiVersion: rbac.authorization.k8s.io/v1
+metadata:
+  name: kubernetes-dashboard-anonymous
+rules:
+- apiGroups: [""]
+  resources: ["services/proxy"]
+  resourceNames: ["https:kubernetes-dashboard:"]
+  verbs: ["get", "list", "watch", "create", "update", "patch", "delete"]
+- nonResourceURLs: ["/ui", "/ui/*", "/api/v1/namespaces/{{ system_namespace }}/services/https:kubernetes-dashboard:/proxy/*"]
+  verbs: ["get", "list", "watch", "create", "update", "patch", "delete"]
+
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: kubernetes-dashboard-anonymous
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: kubernetes-dashboard-anonymous
+subjects:
+- kind: User
+  name: system:anonymous
+
+---
+# ------------------- Dashboard Deployment ------------------- #
+
 kind: Deployment
 apiVersion: extensions/v1beta1
 metadata:
@ -60,10 +127,15 @@ spec:
      labels:
        k8s-app: kubernetes-dashboard
    spec:
+      initContainers:
+      - name: kubernetes-dashboard-init
+        image: {{ dashboard_init_image_repo }}:{{ dashboard_init_image_tag }}
+        volumeMounts:
+        - name: kubernetes-dashboard-certs
+          mountPath: /certs
      containers:
      - name: kubernetes-dashboard
        image: {{ dashboard_image_repo }}:{{ dashboard_image_tag }}
-        # Image is tagged and updated with :head, so always pull it.
        imagePullPolicy: Always
        resources:
          limits:
@ -73,27 +145,45 @@ spec:
            cpu: {{ dashboard_cpu_requests }}
            memory: {{ dashboard_memory_requests }}
        ports:
-        - containerPort: 9090
+        - containerPort: 8443
          protocol: TCP
        args:
+          - --tls-key-file=/certs/dashboard.key
+          - --tls-cert-file=/certs/dashboard.crt
+          - --authentication-mode=token{% if kube_basic_auth|default(false) %},basic{% endif %}
          # Uncomment the following line to manually specify Kubernetes API server Host
          # If not specified, Dashboard will attempt to auto discover the API server and connect
          # to it. Uncomment only if the default does not work.
          # - --apiserver-host=http://my-address:port
+        volumeMounts:
+        - name: kubernetes-dashboard-certs
+          mountPath: /certs
+          readOnly: true
+          # Create on-disk volume to store exec logs
+        - mountPath: /tmp
+          name: tmp-volume
        livenessProbe:
          httpGet:
+            scheme: HTTPS
            path: /
-            port: 9090
+            port: 8443
          initialDelaySeconds: 30
          timeoutSeconds: 30
-{% if rbac_enabled %}
+      volumes:
+      - name: kubernetes-dashboard-certs
+        secret:
+          secretName: kubernetes-dashboard-certs
+      - name: tmp-volume
+        emptyDir: {}
      serviceAccountName: kubernetes-dashboard
-{% endif %}
      # Comment the following tolerations if Dashboard must not be deployed on master
      tolerations:
      - key: node-role.kubernetes.io/master
        effect: NoSchedule
+
 ---
+# ------------------- Dashboard Service ------------------- #
+
 kind: Service
 apiVersion: v1
 metadata:
@ -103,8 +193,7 @@ metadata:
  namespace: {{ system_namespace }}
 spec:
  ports:
-  - port: 80
-    targetPort: 9090
+    - port: 443
+      targetPort: 8443
  selector:
-    k8s-app: kubernetes-dashboard
-
+    k8s-app: kubernetes-dashboard
--- a/roles/kubernetes/preinstall/tasks/verify-settings.yml
+++ b/roles/kubernetes/preinstall/tasks/verify-settings.yml
@ -78,3 +78,10 @@
    that: ansible_swaptotal_mb == 0
  when: kubelet_fail_swap_on|default(true)
  ignore_errors: "{{ ignore_assert_errors }}"
+
+
+- name: Stop if RBAC is not enabled when dashboard is enabled
+  assert:
+    that: rbac_enabled
+  when: dashboard_enabled
+  ignore_errors: "{{ ignore_assert_errors }}"