Enable Cinder coordination¶

To avoid race conditions in the OpenStack Block Storage service (Cinder) with an active/active configuration, you can use a coordination manager system with MySQL as a back end. For example, to prevent deletion of a volume that is being used to create another volume or prevent from attaching a volume that is already being attached.

To enable Cinder coordination:

1. From the Salt Master node, verify that the salt-formula-cinder package version is 2016.12.1+202108101137.19b6edd~xenial1_all or later.

2. From an OpenStack controller node, verify that the python-tooz package version is 1.60.2-1.0~u16.04+mcp4 or later.

3. Open the cluster level of your deployment model.

4. In <cluster_name>/openstack/control.yml, specify the following configuration:

   cinder:
     controller:
       coordination:
         enabled: true
         backend: mysql
   

5. Log in to the Salt Master node.

6. Apply the changes:

   salt -C 'I@cinder:controller' state.sls cinder