This is a PoC for providing automatic evacuation for VMs in OpenStack cloud using Mistral.

Installation

1. Copy filter_vm_action.py and evacuate_vm_action.py to the place reachable by python interpreter - see PYTHONPATH or sys.path for reference.

2. Append lines

   [entry_points]
   mistral.actions =
       …
       custom.filter_vm = filter_vm_action:FilterVmAction
       custom.evacuate = evacuate_vm_action:EvacuateVmAction

   to setup.cfg file under Mistral repository

3. Run db-sync tool via either

   $ tools/sync_db.sh --config-file <path-to-config>

   or

   $ mistral-db-manage --config-file <path-to-config> populate

4. Register Mistral workflow:

   $ mistral workflow-create host-evacuate.yaml

5. Create JSON file with content similar to:

   {
       "search_opts": {
           "host": "compute-hostanme"
       }
   }

6. Trigger the action via:

   $ mistral execution-create host-evacuate input.json

   where input.json is a file created in previous step.