Adding a compute host to a host aggregate

Before a host aggregate can be used by OpenStack Compute, you must first add hosts to the aggregate groups created.

Getting ready

To add a host to an 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 name or ID of the host

For the following example, the required values are as follows:

• Host aggregate: cookbook-ssd-hosts

• Compute host: compute-01

How to do it…

The following process is used to add a host to a host aggregate:

1. List hosts that are already in the aggregate:

   openstack aggregate show cookbook-ssd-hosts
   

   This will bring back an output like the following:

   

2. Now add the specified compute host to this aggregate as follows:

   openstack aggregate add host cookbook-ssd-hosts compute-01
   

   This will bring back an output like the following:

   

How it works…

The openstack aggregate host add command associates a host with a host aggregate in the Nova database...