sample-apiserver: Add RBAC roles and ClusterRoleBindings for Admission Webhooks

staging/src/k8s.io/sample-apiserver/artifacts/example/rbac-bind.yaml

+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: sample-apiserver-clusterrolebinding
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: aggregated-apiserver-clusterrole
+subjects:
+- kind: ServiceAccount
+  name: apiserver
+  namespace: wardle
\ No newline at end of file

staging/src/k8s.io/sample-apiserver/artifacts/example/rbac.yaml

+kind: ClusterRole
+apiVersion: rbac.authorization.k8s.io/v1
+metadata:
+  name: aggregated-apiserver-clusterrole
+rules:
+- apiGroups: [""]
+  resources: ["namespaces"]
+  verbs: ["get", "watch", "list"]
+- apiGroups: ["admissionregistration.k8s.io"]
+  resources: ["mutatingwebhookconfigurations", "validatingwebhookconfigurations"]
+  verbs: ["get", "watch", "list"]
\ No newline at end of file

staging/src/k8s.io/sample-apiserver/docs/minikube-walkthrough.md

@@ -78,6 +78,10 @@ kubectl create -f artifacts/example/sa.yaml -n wardle
 kubectl create -f artifacts/example/auth-delegator.yaml -n kube-system
 kubectl create -f artifacts/example/auth-reader.yaml -n kube-system
 
+# create rbac roles and clusterrolebinding that allow the service account user to use admission webhooks
+kubectl create -f artifacts/example/rbac.yaml
+kubectl create -f artifacts/example/rbac-bind.yaml
+
 # create the service and replication controller
 kubectl create -f artifacts/example/rc.yaml -n wardle
 kubectl create -f artifacts/example/service.yaml -n wardle