add docs to setup auth for kube-registry

cluster/addons/registry/auth/README.md

@@ -0,0 +1,92 @@
+# Enable Authentication with Htpasswd for Kube-Registry 
+
+Docker registry support a few authentication providers. Full list of supported provider can be found [here](https://docs.docker.com/registry/configuration/#auth). This document describes how to enable authentication with htpasswd for kube-registry. 
+
+### Prepare Htpasswd Secret
+
+Please generate your own htpasswd file. Assuming the file you generated is `htpasswd`. 
+Creating secret to hold htpasswd...
+```console
+$ kubectl --namespace=kube-system create secret generic registry-auth-secret --from-file=htpasswd=htpasswd
+```
+
+### Run Registry
+
+Please be noted that this sample rc is using emptyDir as storage backend for simplicity. 
+
+<!-- BEGIN MUNGE: EXAMPLE registry-auth-rc.yaml -->
+```yaml
+apiVersion: v1
+kind: ReplicationController
+metadata:
+  name: kube-registry-v0
+  namespace: kube-system
+  labels:
+    k8s-app: kube-registry
+    version: v0
+#    kubernetes.io/cluster-service: "true"
+spec:
+  replicas: 1
+  selector:
+    k8s-app: kube-registry
+    version: v0
+  template:
+    metadata:
+      labels:
+        k8s-app: kube-registry
+        version: v0
+#        kubernetes.io/cluster-service: "true"
+    spec:
+      containers:
+      - name: registry
+        image: registry:2
+        resources:
+          # keep request = limit to keep this container in guaranteed class
+          limits:
+            cpu: 100m
+            memory: 100Mi
+          requests:
+            cpu: 100m
+            memory: 100Mi
+        env:
+        - name: REGISTRY_HTTP_ADDR
+          value: :5000
+        - name: REGISTRY_STORAGE_FILESYSTEM_ROOTDIRECTORY
+          value: /var/lib/registry
+        - name: REGISTRY_AUTH_HTPASSWD_REALM
+          value: basic_realm
+        - name: REGISTRY_AUTH_HTPASSWD_PATH
+          value: /auth/htpasswd
+        volumeMounts:
+        - name: image-store
+          mountPath: /var/lib/registry
+        - name: auth-dir
+          mountPath: /auth
+        ports:
+        - containerPort: 5000
+          name: registry
+          protocol: TCP
+      volumes:
+      - name: image-store
+        emptyDir: {}
+      - name: auth-dir
+        secret:
+          secretName: registry-auth-secret
+```
+<!-- END MUNGE: EXAMPLE registry-auth-rc.yaml -->
+
+No changes are needed for other components (kube-registry service and proxy). 
+
+### To Verify
+
+Setup proxy or port-forwarding to the kube-registry. Image push/pull should fail without authentication. Then use `docker login` to authenticate with kube-registry and see if it works.
+
+### Configure Nodes to Authenticate with Kube-Registry
+
+By default, nodes assume no authentication is required by kube-registry. Without authentication, nodes cannot pull images from kube-registry. To solve this, more documentation can be found [Here](https://github.com/kubernetes/kubernetes/blob/master/docs/user-guide/images.md#configuring-nodes-to-authenticate-to-a-private-repository)
+
+
+
+
+
+[![Analytics](https://kubernetes-site.appspot.com/UA-36037335-10/GitHub/cluster/addons/registry/auth/README.md?pixel)]()

cluster/addons/registry/auth/registry-auth-rc.yaml

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+apiVersion: v1
+kind: ReplicationController
+metadata:
+  name: kube-registry-v0
+  namespace: kube-system
+  labels:
+    k8s-app: kube-registry
+    version: v0
+#    kubernetes.io/cluster-service: "true"
+spec:
+  replicas: 1
+  selector:
+    k8s-app: kube-registry
+    version: v0
+  template:
+    metadata:
+      labels:
+        k8s-app: kube-registry
+        version: v0
+#        kubernetes.io/cluster-service: "true"
+    spec:
+      containers:
+      - name: registry
+        image: registry:2
+        resources:
+          # keep request = limit to keep this container in guaranteed class
+          limits:
+            cpu: 100m
+            memory: 100Mi
+          requests:
+            cpu: 100m
+            memory: 100Mi
+        env:
+        - name: REGISTRY_HTTP_ADDR
+          value: :5000
+        - name: REGISTRY_STORAGE_FILESYSTEM_ROOTDIRECTORY
+          value: /var/lib/registry
+        - name: REGISTRY_AUTH_HTPASSWD_REALM
+          value: basic_realm
+        - name: REGISTRY_AUTH_HTPASSWD_PATH
+          value: /auth/htpasswd
+        volumeMounts:
+        - name: image-store
+          mountPath: /var/lib/registry
+        - name: auth-dir
+          mountPath: /auth
+        ports:
+        - containerPort: 5000
+          name: registry
+          protocol: TCP
+      volumes:
+      - name: image-store
+        emptyDir: {}
+      - name: auth-dir
+        secret:
+          secretName: registry-auth-secret