Rancher 2 on Openstack with Block Storage Volume

unfortunately our administration office is changing our flavours and soon we ll only have 6 GB of root space (hd) available. Since this is not enough for a rancher node I’d like to create and attach a block storage volume to new rancher nodes.

I don’t see a way currently in the node template. How should this be done - since it s just a default case (small root, attached bs volume) in cloud environments.

Happy for your ideas