A heat template that use docker to create containers for a wordpress install. You need to configure the plugin first in /etc/heat/heat.conf (see the README) and pull the images (i.e: docker pull samalba/wordpress samalba/mysql)

docker-hot-template.yaml

heat_template_version: 2013-05-23

description: >
  Docker example template, you need to docker pull samalba/wordpress and samalba/mysql first.

resources:
  wordpress:
    type: DockerInc::Docker::Container
    properties:
      image: samalba/wordpress
      env:
        - {"Fn::Join": ["=", ["DB_HOSTNAME", { get_attr: [database, network_ip]}]]}
        - {"Fn::Join": ["=", ["DB_PASSWORD", { get_attr: [database, logs_head]}]]}
        - DB_PORT=3306

  database:
    type: DockerInc::Docker::Container
    properties:
      port_specs:
        - 3306
      image: samalba/mysql

outputs:
  info:
    description: IP address of server1 in private network
    value:
      str_replace:
        template: http://host
        params:
          host: { get_attr: [wordpress, network_ip] }

Thank you ! Such concrete template -leveraging DockerInc::Docker::Container- is a blessing (I could not find more of the kind so far or maybe I didn't know where to find them)!

I've just written an article that examines the Docker plugin for Heat in some detail; you can find it at http://blog.oddbit.com/2014/08/30/docker-plugin-for-openstack-he/