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+heat_template_version: 2014-10-16
+
+description: >
+  Example extra config for cluster config
+  this example deploys a random string to all controller and compute
+  nodes, showing how data may be shared amongst nodes, vs the
+  other ExtraConfig interfaces which act only on individual nodes.
+
+# Parameters passed from the parent template - note if you maintain
+# out-of-tree templates they may require additional parameters if the
+# in-tree templates add a new role.
+parameters:
+  controller_servers:
+    type: json
+  compute_servers:
+    type: json
+  blockstorage_servers:
+    type: json
+  objectstorage_servers:
+    type: json
+  cephstorage_servers:
+    type: json
+# Note extra parameters can be defined, then passed data via the
+# environment parameter_defaults, without modifying the parent template
+
+resources:
+
+  Random:
+    type: OS::Heat::RandomString
+
+  RandomConfig:
+    type: OS::Heat::SoftwareConfig
+    properties:
+      group: script
+      inputs:
+      - name: random_value
+      config: |
+        #!/bin/sh
+        echo $random_value > /root/random_value
+
+  RandomDeploymentsController:
+    type: OS::Heat::SoftwareDeployments
+    properties:
+      servers:  {get_param: controller_servers}
+      config: {get_resource: RandomConfig}
+      actions: ['CREATE'] # Only do this on CREATE
+      input_values:
+        random_value: {get_attr: [Random, value]}
+
+  RandomDeploymentsCompute:
+    type: OS::Heat::SoftwareDeployments
+    properties:
+      servers:  {get_param: compute_servers}
+      config: {get_resource: RandomConfig}
+      actions: ['CREATE'] # Only do this on CREATE
+      input_values:
+        random_value: {get_attr: [Random, value]}
+
+outputs:
+  # This value should change if the configuration data has changed
+  # It is used to e.g re-apply puppet after hieradata values change.
+  config_identifier:
+    value: {get_attr: [Random, value]}