Launching instances in specific Availability Zones

Availability zones are logical separations of compute resources, representing groups of hypervisors that a user will be able to select when requesting to launch an instance. If no availability zones have been created, the default called nova will be used. When an instance is launched in most default cases, the scheduler determines which host will run it within that zone. As a user of the OpenStack cloud, you can specify which availability zone to use if more than one is available. This can help you create more resilient applications. By allowing an instance to be spun up in two separate places, we are protecting ourselves against the failure of a complete zone.

Getting ready

Ensure you are logged onto an Ubuntu host that has access to our OpenStack environment on the 192.168.100.0/24 public network. This host will be used to run client tools against the OpenStack environment created. If you are using the accompanying Vagrant environment, as...