Support adding a swap file to overcloud nodes

Create a new SoftwareDeployment that can be used to add a swap file to
all nodes The amount of swap and the location of the swap file can be
customized via parameter_defaults and the swap_size_megabytes/swap_path
parameters.

Change-Id: I1fb14c0fab2255410fceb26c3a7d5cfe0ba57b3b

extraconfig/all_nodes/swap.yaml

@@ -0,0 +1,108 @@
+heat_template_version: 2014-10-16
+
+description: >
+  Extra config to add swap space to 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
+  swap_size_megabytes:
+    type: string
+    description: Amount of swap space to allocate in megabytes
+    default: '4096'
+  swap_path:
+    type: string
+    description: Full path to location of swap file
+    default: '/swap'
+
+
+resources:
+
+  SwapConfig:
+    type: OS::Heat::SoftwareConfig
+    properties:
+      group: script
+      config: |
+        #!/bin/bash
+        set -eux
+        if [ ! -f $swap_path ]; then
+          dd if=/dev/zero of=$swap_path count=$swap_size_megabytes bs=1M
+          chmod 0600 $swap_path
+          mkswap $swap_path
+          swapon $swap_path
+        else
+          echo "$swap_path already exists"
+        fi
+        echo "$swap_path swap swap defaults 0 0" >> /etc/fstab
+      inputs:
+        - name: swap_size_megabytes
+          description: Amount of swap space to allocate in megabytes
+          default: '4096'
+        - name: swap_path
+          description: Full path to location of swap file
+          default: '/swap'
+
+  ControllerSwapDeployment:
+    type: OS::Heat::SoftwareDeploymentGroup
+    properties:
+      config: {get_resource: SwapConfig}
+      servers: {get_param: controller_servers}
+      input_values:
+        swap_size_megabytes: {get_param: swap_size_megabytes}
+        swap_path: {get_param: swap_path}
+      actions: ["CREATE"]
+
+  ComputeSwapDeployment:
+    type: OS::Heat::SoftwareDeploymentGroup
+    properties:
+      config: {get_resource: SwapConfig}
+      servers: {get_param: compute_servers}
+      input_values:
+        swap_size_megabytes: {get_param: swap_size_megabytes}
+        swap_path: {get_param: swap_path}
+      actions: ["CREATE"]
+
+  BlockStorageSwapDeployment:
+    type: OS::Heat::SoftwareDeploymentGroup
+    properties:
+      config: {get_resource: SwapConfig}
+      servers: {get_param: blockstorage_servers}
+      input_values:
+        swap_size_megabytes: {get_param: swap_size_megabytes}
+        swap_path: {get_param: swap_path}
+      actions: ["CREATE"]
+
+  ObjectStorageSwapDeployment:
+    type: OS::Heat::SoftwareDeploymentGroup
+    properties:
+      config: {get_resource: SwapConfig}
+      servers: {get_param: objectstorage_servers}
+      input_values:
+        swap_size_megabytes: {get_param: swap_size_megabytes}
+        swap_path: {get_param: swap_path}
+      actions: ["CREATE"]
+
+  CephStorageSwapDeployment:
+    type: OS::Heat::SoftwareDeploymentGroup
+    properties:
+      config: {get_resource: SwapConfig}
+      servers: {get_param: cephstorage_servers}
+      input_values:
+        swap_size_megabytes: {get_param: swap_size_megabytes}
+        swap_path: {get_param: swap_path}
+      actions: ["CREATE"]
+
+outputs:
+  config_identifier:
+    value: none