Availability zone in OpenStack. The main purpose of this article is to play a bit with availability zones.
The good thing with availability zones is that you can manage and isolate different entities in your infrastructure. For instance, if some customers need really fast VMs you can host them on your super expensive compute rack full of SSDs.Then what you can do is boot all the instances of your customer that way:
$ nova boot bla bla bla --availability-zone <zone>:<compute-node>
Everything is managed by this nova flag, and the only thing that you have to do is to define a name for your zone (obviously put something relevant):
# Availability zone