Working with OpenStack Images
Some tips for creating and extending OpenStack images
A future revision of the HA architecture should limit Pacemaker involvement to services like Galera, Rabbit and the few remaining OpenStack services that can...
The is a spectrum for availability solutions, where you fit depends on what assumptions you can make about your application stack.
A more reliable way to receive notification of cluster events is coming in Pacemaker 1.1.14.