As soon as I try to create a service which uses the convoy-nfs driver, I get the following error:
Failed to allocate instance [container:1i84]: Bad instance [container:1i84] in state [error]: Scheduling failed: valid host(s) , volume  must have exactly these pool(s): , valid host(s) 
I have used the catalog template to create the convoy-nfs stack. The NFS server is configured on the same machine where the Rancher server runs. The other hosts already mounted the nfs share. It doesn’t matter if I create a volume first or specify the volume name during service creation. I get the same error.
The rancher/server container reports the following:
2016-11-07 16:19:48,206 ERROR [cba5e2f8-0be9-4d83-9843-c7a1658f309b:1760] [instance:85] [instance.start->(InstanceStart)]  [cutorService-44] [i.c.p.process.instance.InstanceStart] Failed to Scheduling for instance 
Rancher version: v1.2.0-pre4-rc6