#95 document --kubeconfig-contexts option

docs/multiple-clusters.rst

@@ -26,9 +26,9 @@ Assuming ``~/.kube/config`` as the following contents with two defined contexts:
       name: kube_bar_example_org
     contexts:
     - context: {cluster: kube_foo_example_org, user: kube_foo_example_org}
-      name: kube_foo_example_org
+      name: foo
     - context: {cluster: kube_bar_example_org, user: kube_bar_example_org}
-      name: kube_bar_example_org
+      name: bar
     current-context: kube_foo_example_org
     users:
     - name: kube_foo_example_org
@@ -43,6 +43,14 @@ Kubernetes Operational View would try to reach both endpoints with the respectiv
     $ # note that we need to mount the local ~/.kube/config file into the Docker container
     $ docker run -it -p 8080:8080 -v ~/.kube/config:/kubeconfig hjacobs/kube-ops-view --kubeconfig-path=/kubeconfig
 
+You can select which clusters should be queried by specifying a list of kubeconfig contexts with the ``--kubeconfig-contexts`` option:
+
+.. code-block:: bash
+
+    $ docker run -it -p 8080:8080 -v ~/.kube/config:/kubeconfig hjacobs/kube-ops-view --kubeconfig-path=/kubeconfig --kubeconfig-contexts=bar
+
+This would only query the Kubernetes cluster defined by the ``bar`` context.
+
 
 Cluster Registry
 ================