Sometimes, you may need to remove a compute node from a cluster for troubleshooting or maintenance reasons. You should be careful while doing so, since it could negatively affect running VMs. Before getting started, make sure you have enough resources in your compute cluster to migrate running VMs to other compute nodes before removing the node.
Ensure you are logged in to 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 described in the Preface, you can use the controller node. This node has the python-novaclient package that provides the nova command-line client.
If you created this node with Vagrant, you can execute the following command:
vagrant ssh controller
Ensure that you have set the following credentials (adjust the path to your certificates...