heat_template_version: wallaby

description: Template file to add a swap file to a node.

parameters:
  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'

{% for role in roles %}
  {{role.name}}SwapDeployment:
    type: OS::Heat::SoftwareDeploymentGroup
    properties:
      name: {{role.name}}SwapDeployment
      config: {get_resource: SwapConfig}
      servers: {get_param: [servers, {{role.name}}]}
      input_values:
        swap_size_megabytes: {get_param: swap_size_megabytes}
        swap_path: {get_param: swap_path}
      actions: ["CREATE"]
{% endfor %}