Remove a compute service (#263)

Signed-off-by: Christian Berendt <berendt@osism.tech>

Author: berendt

docs/guides/operations-guide/openstack/day2-operations/resource-manager.md

@@ -5,6 +5,38 @@ sidebar_position: 52
 
 # Resource Manager
 
+## Preparations
+
+Prepare use of the OpenStack Resource Manager.
+
+```
+git clone https://github.com/osism/openstack-resource-manager
+cd openstack-resource-manager
+pipenv install
+pipenv shell
+```
+
+Prepare cloud profile `admin` in `clouds.yml` and `secure.yml` (use `clouds.yml.sample` and `secure.yml.sample`
+in the [openstack-resource-manager](https://github.com/osism/openstack-resource-manager) repository as sample files).
+
+## Nova
+
+### Live migration
+
+Live migrate all instances from compute node `SOURCE` to compute node `TARGET`.
+
+```
+$ python3 src/host-action.py --yes --disable --action live-migrate --host SOURCE --input TARGET
+```
+
+### Evacutation
+
+Evacuate all instances from compute node `SOURCE` to compute node `TARGET`.
+
+```
+$ python3 src/host-action.py --yes --action evacutate --host SOURCE --input TARGET
+```
+
 ## Octavia
 
 ### Amphora rotation

docs/guides/operations-guide/openstack/nova.md

@@ -58,3 +58,38 @@ openstack --os-cloud admin compute service list --long
 | b77c5aeb-91c0-4972-84ea-7c8bd5a49fdd | nova-compute   | testbed-node-0  | nova     | disabled | up    | 2023-12-14T14:20:24.000000 | None                                               | False       |
 +--------------------------------------+----------------+-----------------+----------+----------+-------+----------------------------+----------------------------------------------------+-------------+
 ```
+
+## Remove a compute service
+
+1. Live migrate all instances running on the compute node
+   with the help of the [OpenStack Resource Manager](./day2-operations/resource-manager#live-migration)
+
+2. Evacuate all instances on the compute node
+   with the help of the [OpenStack Resource Manager](./day2-operations/resource-manager#evacutation)
+
+3. Ensure that no more instances are running on the compute node
+
+   ```
+   ps ax | grep qemu
+   ```
+
+4. Stop all OpenStack Nova services on the compute node
+
+   ```
+   systemctl stop kolla-nova_ssh-container.service
+   systemctl stop kolla-nova_libvirt-container.service
+   systemctl stop kolla-nova_compute-container.service
+
+5. Delete the compute service
+
+   ```
+   $ openstack --os-cloud admin compute service list
+   +--------------------------------------+----------------+---------+----------+----------+-------+----------------------------+
+   | ID                                   | Binary         | Host    | Zone     | Status   | State | Updated At                 |
+   +--------------------------------------+----------------+---------+----------+----------+-------+----------------------------+
+   | f161d739-21de-4cb0-a5d3-d21cff652697 | nova-scheduler | manager | internal | enabled  | up    | 2023-12-21T11:52:59.000000 |
+   | 646d16db-acd9-486c-bd16-8fe2c13bf198 | nova-conductor | manager | internal | enabled  | up    | 2023-12-21T11:53:04.000000 |
+   | 90345eb5-cf2f-47ef-becc-758ee36fb132 | nova-compute   | manager | nova     | disabled | down  | 2023-12-21T11:53:00.000000 |
+   +--------------------------------------+----------------+---------+----------+----------+-------+----------------------------+
+   $ openstack --os-cloud admin compute service delete 90345eb5-cf2f-47ef-becc-758ee36fb132
+   ```