Doc updates for controller namespace

Make all namespace settings explicit and add more documentation around
setting appropriate namespace when installing.

README.md

@@ -60,7 +60,7 @@ The Volume Snapshot feature now depends on a new, volume snapshot controller in
 
 Therefore, it is strongly recommended that Kubernetes distributors bundle and deploy the controller and CRDs as part of their Kubernetes cluster management process (independent of any CSI Driver).
 
-If your cluster does not come pre-installed with the correct components, you may manually install these components by executing the following steps.
+If your Kubernetes distribution does not bundle the snapshot controller, you may manually install these components by executing the following steps. Note that the snapshot controller YAML files in the git repository deploy into the default namespace for system testing purposes. For general use, update the snapshot controller YAMLs with an appropriate namespace prior to installing. For example, on a Vanilla Kubernetes cluster update the namespace from 'default' to 'kube-system' prior to issuing the kubectl create command.
 
 Install Snapshot Beta CRDs:
 * kubectl create -f config/crd
@@ -68,6 +68,7 @@ Install Snapshot Beta CRDs:
 * Do this once per cluster
 
 Install Common Snapshot Controller:
+* Update the namespace to an appropriate value for your environment (e.g. kube-system)
 * kubectl create -f deploy/kubernetes/snapshot-controller
 * https://github.com/kubernetes-csi/external-snapshotter/tree/master/deploy/kubernetes/snapshot-controller
 * Do this once per cluster

deploy/kubernetes/snapshot-controller/rbac-snapshot-controller.yaml

@@ -1,8 +1,15 @@
 # RBAC file for the snapshot controller.
+#
+# The snapshot controller implements the control loop for CSI snapshot functionality.
+# It should be installed as part of the base Kubernetes distribution in an appropriate
+# namespace for components implementing base system functionality. For installing with
+# Vanilla Kubernetes, kube-system makes sense for the namespace.
+
 apiVersion: v1
 kind: ServiceAccount
 metadata:
   name: snapshot-controller
+  namespace: default # TODO: replace with the namespace you want for your controller, e.g. kube-system
 
 ---
 kind: ClusterRole
@@ -44,8 +51,7 @@ metadata:
 subjects:
   - kind: ServiceAccount
     name: snapshot-controller
-    # replace with non-default namespace name
+    namespace: default # TODO: replace with the namespace you want for your controller, e.g. kube-system
-    namespace: default
 roleRef:
   kind: ClusterRole
   # change the name also here if the ClusterRole gets renamed
@@ -56,7 +62,7 @@ roleRef:
 kind: Role
 apiVersion: rbac.authorization.k8s.io/v1
 metadata:
-  namespace: default # TODO: replace with the namespace you want for your controller
+  namespace: default # TODO: replace with the namespace you want for your controller, e.g. kube-system
   name: snapshot-controller-leaderelection
 rules:
 - apiGroups: ["coordination.k8s.io"]
@@ -68,11 +74,11 @@ kind: RoleBinding
 apiVersion: rbac.authorization.k8s.io/v1
 metadata:
   name: snapshot-controller-leaderelection
-  namespace: default # TODO: replace with the namespace you want for your controller
+  namespace: default # TODO: replace with the namespace you want for your controller, e.g. kube-system
 subjects:
   - kind: ServiceAccount
     name: snapshot-controller
-    namespace: default # TODO: replace with the namespace you want for your controller
+    namespace: default # TODO: replace with the namespace you want for your controller, e.g. kube-system
 roleRef:
   kind: Role
   name: snapshot-controller-leaderelection

deploy/kubernetes/snapshot-controller/setup-snapshot-controller.yaml

@@ -1,10 +1,16 @@
 # This YAML file shows how to deploy the snapshot controller
 
+# The snapshot controller implements the control loop for CSI snapshot functionality.
+# It should be installed as part of the base Kubernetes distribution in an appropriate
+# namespace for components implementing base system functionality. For installing with
+# Vanilla Kubernetes, kube-system makes sense for the namespace.
+
 ---
 kind: StatefulSet
 apiVersion: apps/v1
 metadata:
   name: snapshot-controller
+  namespace: default # TODO: replace with the namespace you want for your controller, e.g. kube-system
 spec:
   serviceName: "snapshot-controller"
   replicas: 1