failed to persist metadata - open nsqd.308.dat.xxx.tmp: permission denied

Hi all, just installed Workflow onto a 3-node Vagrant test network using your [great instructions](https://deis.com/docs/workflow/quickstart/provider/vagrant/install-vagrant/). Unfortunately, nsqd goes into an error-restart:

> % kubectl --namespace=deis log deis-nsqd-2362409882-od1bd
> Set broadcast-address to and MAX_READY_COUNT to 10000
> [nsqd] 2016/10/10 19:41:21.340182 nsqd v0.3.8 (built w/go1.6.2)
> [nsqd] 2016/10/10 19:41:21.342169 ID: 308
> [nsqd] 2016/10/10 19:41:21.342204 NSQ: persisting topic/channel metadata to nsqd.308.dat
> 2016/10/10 19:41:21 ERROR: failed to persist metadata - open nsqd.308.dat.2082426343634159740.tmp: permission denied

Not even sure where to start with this one -- is nsqd failing for some other reason then failing to persist the metadata, or is that the root problem.

Kube 1.3.8 on a hand-rolled CoreOS/Vagrant configuration, so it's entirely possible I've screwed something up. However, other cursory Kubernetes tests appear to work.