Creating a host aggregate

After we have enabled OpenStack to allow host aggregate filtering, we can then proceed to create our host aggregates. This recipe will show you how to create a host aggregate.

Getting ready

To create a host aggregate, you will need the following information:

• The openstack command-line client

• The openrc file containing appropriate credentials

• A name for the aggregate

For our example, the host aggregate will be named cookbook-ssd-hosts.

How to do it…

To create a host aggregate, carry out the following steps:

1. First, we will list the current host aggregates:

   openstack aggregate list
   

   This gives an output like the following:

   

2. Next, we will create the aggregate:

   openstack aggregate create cookbook-ssd-hosts
   

   This will bring back an output like the following:

   

3. List the host aggregates:

   openstack aggregate list
   

   This gives an output like the following:

   

How it works…

In Nova, a host aggregate provides OpenStack administrators and operators a mechanism to group hosts based on arbitrary attributes...