Removing a compute host from a host aggregate

If the properties of a host change, or the needs of an aggregate change, hosts can be removed from a host aggregate.

Getting ready

To remove a host from 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 name or ID of the host

How to do it…

1. List hosts already in the aggregate with the following command:

   openstack aggregate show cookbook-ssd-hosts
   

   This will bring back an output like the following. Note that the hosts field shows the compute hosts that are currently associated with the host aggregate:

   

2. To remove the compute host from this host aggregate, issue the following command:

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

   This will bring back the following. Note that in the hosts field, compute-01 is now missing:

   

How it works…

Removing a host from a host aggregate tells OpenStack Compute that the additional...