Autoscaling instances with Heat

Using Heat's autoscaling, it is possible to monitor a set of instances and add or subtract instances to meet load demands. In the same GitHub repository that the previous examples were taken from, there is an autoscaling example. For the autoscaling example to work, you will need to grab two templates:

• https://github.com/openstack/heat-templates/blob/master/hot/autoscaling.yaml

• https://github.com/openstack/heat-templates/blob/master/hot/lb_server.yaml

These templates are written to launch a single database instance and to add and remove web server instances respective to the load put on the WordPress stack running on the web servers.