Add kube dashboard, enabled by default (#1643)

* Add kube dashboard, enabled by default

Also add rbac role for kube user

* Update main.yml

docs/getting-started.md

@@ -89,3 +89,15 @@ file yourself.
 
 For more information on kubeconfig and accessing a Kubernetes cluster, refer to
 the Kubernetes [documentation](https://kubernetes.io/docs/tasks/access-application-cluster/configure-access-multiple-clusters/).
+
+Accessing Kubernetes Dashboard
+------------------------------
+
+If the variable `dashboard_enabled` is set (default is true), then you can
+access the Kubernetes Dashboard at the following URL:
+
+  https://kube:_kube-password_@_host_:6443/ui/
+
+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).

inventory/group_vars/k8s-cluster.yml

@@ -45,6 +45,8 @@ kube_users:
   kube:
     pass: "{{kube_api_pwd}}"
     role: admin
+    groups:
+      - system:masters
 
 ## It is possible to activate / deactivate selected authentication methods (basic auth, static token auth)
 #kube_oidc_auth: false
@@ -141,6 +143,9 @@ vault_deployment_type: docker
 # K8s image pull policy (imagePullPolicy)
 k8s_image_pull_policy: IfNotPresent
 
+# Kubernetes dashboard (available at http://first_master:6443/ui by default)
+dashboard_enabled: true
+
 # Monitoring apps for k8s
 efk_enabled: false
 

roles/kubernetes-apps/ansible/defaults/main.yml

@@ -38,6 +38,17 @@ netchecker_server_memory_limit: 256M
 netchecker_server_cpu_requests: 50m
 netchecker_server_memory_requests: 64M
 
+# Dashboard
+dashboard_enabled: false
+dashboard_image_repo: kubernetesdashboarddev/kubernetes-dashboard-amd64
+dashboard_image_tag: head
+
+# Limits for dashboard
+dashboard_cpu_limit: 100m
+dashboard_memory_limit: 256M
+dashboard_cpu_requests: 50m
+dashboard_memory_requests: 64M
+
 # SSL
 etcd_cert_dir: "/etc/ssl/etcd/ssl"
 canal_cert_dir: "/etc/canal/certs"

roles/kubernetes-apps/ansible/tasks/dashboard.yml

@@ -0,0 +1,20 @@
+---
+- 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}
+  register: manifests
+  when: inventory_hostname == groups['kube-master'][0]
+
+- name: Kubernetes Apps | Start dashboard
+  kube:
+    name: "{{item.item.name}}"
+    namespace: "{{system_namespace}}"
+    kubectl: "{{bin_dir}}/kubectl"
+    resource: "{{item.item.type}}"
+    filename: "{{kube_config_dir}}/{{item.item.file}}"
+    state: "latest"
+  with_items: "{{ manifests.results }}"
+  when: inventory_hostname == groups['kube-master'][0]

roles/kubernetes-apps/ansible/tasks/main.yml

@@ -63,3 +63,8 @@
   include: tasks/netchecker.yml
   when: deploy_netchecker
   tags: netchecker
+
+- name: Kubernetes Apps | Dashboard
+  include: tasks/dashboard.yml
+  when: dashboard_enabled
+  tags: dashboard

roles/kubernetes-apps/ansible/templates/dashboard.yml.j2

@@ -0,0 +1,110 @@
+# Copyright 2015 Google Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# 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).
+#
+# Example usage: kubectl create -f <this_file>
+
+{% if rbac_enabled %}
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  labels:
+    k8s-app: kubernetes-dashboard
+  name: kubernetes-dashboard
+  namespace: {{ system_namespace }}
+---
+apiVersion: rbac.authorization.k8s.io/v1beta1
+kind: ClusterRoleBinding
+metadata:
+  name: kubernetes-dashboard
+  labels:
+    k8s-app: kubernetes-dashboard
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: cluster-admin
+subjects:
+- kind: ServiceAccount
+  name: kubernetes-dashboard
+  namespace: {{ system_namespace }}
+{% endif %}
+---
+kind: Deployment
+apiVersion: extensions/v1beta1
+metadata:
+  labels:
+    k8s-app: kubernetes-dashboard
+  name: kubernetes-dashboard
+  namespace: {{ system_namespace }}
+spec:
+  replicas: 1
+  revisionHistoryLimit: 10
+  selector:
+    matchLabels:
+      k8s-app: kubernetes-dashboard
+  template:
+    metadata:
+      labels:
+        k8s-app: kubernetes-dashboard
+    spec:
+      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:
+            cpu: {{ dashboard_cpu_limit }}
+            memory: {{ dashboard_memory_limit }}
+          requests:
+            cpu: {{ dashboard_cpu_requests }}
+            memory: {{ dashboard_memory_requests }}
+        ports:
+        - containerPort: 9090
+          protocol: TCP
+        args:
+          # 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
+        livenessProbe:
+          httpGet:
+            path: /
+            port: 9090
+          initialDelaySeconds: 30
+          timeoutSeconds: 30
+{% if rbac_enabled %}
+      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
+---
+kind: Service
+apiVersion: v1
+metadata:
+  labels:
+    k8s-app: kubernetes-dashboard
+  name: kubernetes-dashboard
+  namespace: {{ system_namespace }}
+spec:
+  ports:
+  - port: 80
+    targetPort: 9090
+  selector:
+    k8s-app: kubernetes-dashboard
+