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Remove a compute host

The OpenStack-Ansible Operator Tooling repository contains a playbook for removing a compute host from an OpenStack-Ansible environment. To remove a compute host, follow the below procedure.

Note

This guide describes how to remove a compute node from an OpenStack-Ansible environment completely. Perform these steps with caution, as the compute node will no longer be in service after the steps have been completed. This guide assumes that all data and instances have been properly migrated.

1. Disable all OpenStack services running on the compute node. This can include, but is not limited to, the nova-compute service and the neutron agent service.

   Note

   Ensure this step is performed first.

   For OVS deployments:

   # Run these commands on the compute node to be removed
   # systemctl stop nova-compute
   # systemctl stop neutron-openvswitch-agent
   

   For deployments using OVN in addition to stopping nova-compute, you should also stop the OVN services:

   # Run these commands on the compute node to be removed
   # systemctl stop nova-compute
   # systemctl stop neutron-ovn-metadata-agent
   # systemctl stop ovn-controller # if you're using compute as gateway nodes
   

   If the compute node is used as LVM-backed storage, ensure the cinder-volume service is stopped as well.

   # Run these commands on the compute node to be removed
   # systemctl stop cinder-volume
   

2. Clone the openstack-ansible-ops repository to your deployment host:

   $ git clone https://opendev.org/openstack/openstack-ansible-ops \
     /opt/openstack-ansible-ops
   

3. Run the remove_compute_node.yml Ansible playbook with the host_to_be_removed user variable set:

   $ cd /opt/openstack-ansible-ops/ansible_tools/playbooks
   openstack-ansible remove_compute_node.yml \
   -e host_to_be_removed="<name-of-compute-host>"
   

4. After the playbook completes, remove the compute node from the OpenStack-Ansible configuration file in /etc/openstack_deploy/openstack_user_config.yml.