Adding metadata to a host aggregate

The power of host aggregates comes from the ability to use them to logically group hosts based on their properties. This can be used, for example, to enable load balancing, enforce physical separation, or keep instances that are insecure from being scheduled into a secured environment. We will show this by matching the metadata of a host aggregate with that of an instance flavor.

Getting ready

To add metadata to a host aggregate, you will need the following information:

• The openstack command-line client

• The openrc file containing appropriate credentials

• The name or ID of the aggregate

• The metadata property to add

In our example, these values will be the following:

• Host aggregate: cookbook-ssd-hosts

• Metadata: ssd=true

How to do it…

To add metadata to host aggregate, use the following process:

1. Show the existing metadata associated with an aggregate:

   openstack aggregate show cookbook-ssd-hosts
   

   This will bring back an output like the following. Note that the properties...