Networking changes added

release-1.6/k8s_1.6_release_notes_draft.md

@@ -65,7 +65,26 @@ Features for this release were tracked via the use of the [kubernetes/features](
 #### New Features
 - **[beta]** `kubefed` has graduated to beta: supports hosting federation on on-prem clusters, automatically configures `kube-dns` in joining clusters and allows passing arguments to federation components.
 
-### Networking
+### Network
+#### Notable Changes
+* Adds support for configurable DNS stub domains and upstream nameservers to kube-dns.
+  The following configuration options have been added to the `kube-system:kube-dns` ConfigMap:
+  ```
+  "stubDomains": {
+    "acme.local": ["1.2.3.4"]
+  },
+  ```
+  is a map of domain to list of nameservers for the domain. This is used
+  to inject private DNS domains into the kube-dns namespace. In the above
+  example, any DNS requests for *.acme.local will be served by the
+  nameserver 1.2.3.4.
+  ```
+  "upstreamNameservers": ["8.8.8.8", "8.8.4.4"]
+  ```
+  is a list of upstreamNameservers to use, overriding the configuration
+  specified in /etc/resolv.conf.
+
+* An empty `kube-system:kube-dns` ConfigMap will be created for the cluster if one did not already exist.
 #### Breaking Changes
 - Not all CNI plugins are compatible with Kubernetes 1.6.  [Check the plugin page for up to date support information](https://docs.google.com/spreadsheets/d/1Nqa6y4J3kEE2wW_wNFSwuAuADAl74vdN6jYGmwXRBv8/edit#gid=0).