basic rbac support

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

@@ -41,3 +41,7 @@ netchecker_server_memory_requests: 64M
 etcd_cert_dir: "/etc/ssl/etcd/ssl"
 canal_cert_dir: "/etc/canal/certs"
 
+kubedns_rbac_resources:
+  - clusterrole
+  - clusterrolebinding
+  - sa

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

@@ -13,11 +13,34 @@
     src: "{{item.file}}"
     dest: "{{kube_config_dir}}/{{item.file}}"
   with_items:
-    - {name: kube-dns, file: kubedns-deploy.yml, type: deployment}
-    - {name: kube-dns, file: kubedns-svc.yml, type: svc}
+    - {name: kubedns, file: kubedns-sa.yml, type: sa}
+    - {name: kubedns, file: kubedns-deploy.yml, type: deployment}
+    - {name: kubedns, file: kubedns-svc.yml, type: svc}
+    - {name: kubedns-autoscaler, file: kubedns-autoscaler-sa.yml, type: sa}
+    - {name: kubedns-autoscaler, file: kubedns-autoscaler-clusterrole.yml, type: clusterrole}
+    - {name: kubedns-autoscaler, file: kubedns-autoscaler-clusterrolebinding.yml, type: clusterrolebinding}
     - {name: kubedns-autoscaler, file: kubedns-autoscaler.yml, type: deployment}
   register: manifests
-  when: dns_mode != 'none' and inventory_hostname == groups['kube-master'][0]
+  when:
+    - dns_mode != 'none' and inventory_hostname == groups['kube-master'][0]
+    - rbac_enabled or item.type not in kubedns_rbac_resources
+  tags: dnsmasq
+
+# see https://github.com/kubernetes/kubernetes/issues/45084
+# TODO: this is only needed for "old" kube-dns
+- name: Kubernetes Apps | Patch system:kube-dns ClusterRole
+  command: >
+    {{bin_dir}}/kubectl patch clusterrole system:kube-dns
+    --patch='{
+               "rules": [
+                 {
+                   "apiGroups" : [""],
+                   "resources" : ["endpoints", "services"],
+                   "verbs": ["list", "watch", "get"]
+                 }
+               ]
+             }'
+  when: dns_mode != 'none' and inventory_hostname == groups['kube-master'][0] and rbac_enabled
   tags: dnsmasq
 
 - name: Kubernetes Apps | Start Resources
@@ -29,6 +52,7 @@
     filename: "{{kube_config_dir}}/{{item.item.file}}"
     state: "{{item.changed | ternary('latest','present') }}"
   with_items: "{{ manifests.results }}"
+  failed_when: manifests|failed and "Error from server (AlreadyExists)" not in manifests.msg
   when: dns_mode != 'none' and inventory_hostname == groups['kube-master'][0]
   tags: dnsmasq
 

roles/kubernetes-apps/ansible/templates/kubedns-autoscaler-clusterrole.yml

@@ -0,0 +1,32 @@
+# Copyright 2016 The Kubernetes Authors. 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.
+
+kind: ClusterRole
+apiVersion: rbac.authorization.k8s.io/v1beta1
+metadata:
+  name: cluster-proportional-autoscaler
+  namespace: {{ system_namespace }}
+rules:
+  - apiGroups: [""]
+    resources: ["nodes"]
+    verbs: ["list"]
+  - apiGroups: [""]
+    resources: ["replicationcontrollers/scale"]
+    verbs: ["get", "update"]
+  - apiGroups: ["extensions"]
+    resources: ["deployments/scale", "replicasets/scale"]
+    verbs: ["get", "update"]
+  - apiGroups: [""]
+    resources: ["configmaps"]
+    verbs: ["get", "create"]

roles/kubernetes-apps/ansible/templates/kubedns-autoscaler-clusterrolebinding.yml

@@ -0,0 +1,27 @@
+# Copyright 2016 The Kubernetes Authors. 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.
+
+kind: ClusterRoleBinding
+apiVersion: rbac.authorization.k8s.io/v1beta1
+metadata:
+  name: cluster-proportional-autoscaler
+  namespace: {{ system_namespace }}
+subjects:
+  - kind: ServiceAccount
+    name: cluster-proportional-autoscaler
+    namespace: {{ system_namespace }}
+roleRef:
+  kind: ClusterRole
+  name: cluster-proportional-autoscaler
+  apiGroup: rbac.authorization.k8s.io

roles/kubernetes-apps/ansible/templates/kubedns-autoscaler-sa.yml

@@ -0,0 +1,19 @@
+# Copyright 2016 The Kubernetes Authors. 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.
+
+kind: ServiceAccount
+apiVersion: v1
+metadata:
+  name: cluster-proportional-autoscaler
+  namespace: {{ system_namespace }}

roles/kubernetes-apps/ansible/templates/kubedns-autoscaler.yml

@@ -16,7 +16,7 @@ apiVersion: extensions/v1beta1
 kind: Deployment
 metadata:
   name: kubedns-autoscaler
-  namespace: kube-system
+  namespace: {{ system_namespace }}
   labels:
     k8s-app: kubedns-autoscaler
     kubernetes.io/cluster-service: "true"
@@ -39,11 +39,13 @@ spec:
                 memory: "10Mi"
         command:
           - /cluster-proportional-autoscaler
-          - --namespace=kube-system
+          - --namespace={{ system_namespace }}
           - --configmap=kubedns-autoscaler
           # Should keep target in sync with cluster/addons/dns/kubedns-controller.yaml.base
           - --target=Deployment/kube-dns
           - --default-params={"linear":{"nodesPerReplica":{{ kubedns_nodes_per_replica }},"min":{{ kubedns_min_replicas }}}}
           - --logtostderr=true
           - --v=2
-
+{% if rbac_enabled %}
+      serviceAccountName: cluster-proportional-autoscaler
+{% endif %}

roles/kubernetes-apps/ansible/templates/kubedns-deploy.yml

@@ -151,4 +151,6 @@ spec:
             memory: 20Mi
             cpu: 10m
       dnsPolicy: Default  # Don't use cluster DNS.
-
+{% if rbac_enabled %}
+      serviceAccountName: kube-dns
+{% endif %}

roles/kubernetes-apps/ansible/templates/kubedns-sa.yml

@@ -0,0 +1,7 @@
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: kube-dns
+  namespace: {{ system_namespace }}
+  labels:
+    kubernetes.io/cluster-service: "true"