Gluster server needs a filesystem that supports extended attributes for its
data. Some distros (Debian, Ubuntu) ship Docker that runs containers on aufs,
which does not support extended attributes and therefore Gluster server fails
there.
We can use tmpfs for Gluster server data volumes instead of a directory inside
the container.
We can then avoid the following warning:
```
WARNING: The '--' argument must be specified between gcloud specific args on the left and DOCKER_ARGS on the right. IMPORTANT: previously, commands allowed the omission of the --, and unparsed arguments were treated as implementation args. This usage is being deprecated and will be removed in March 2017.
This will be strictly enforced in March 2017. Use 'gcloud beta docker' to see new behavior.
```
Signed-off-by: Jess Frazelle <acidburn@google.com>
Since this is a container service port anyways, "insecure" is a bit of
a red herring. There's no real security relevance to the incoming port
numbers for the NFS server pod.
This lets us get rid of the examples/nfs/exporter Docker build
(@jsafrane's personal image).
From RFC 3530:
During the grace period, the server must reject READ and WRITE operations
and non-reclaim locking requests (i.e., other LOCK and OPEN operations)
with an error of NFS4ERR_GRACE.
That basically means that all open() calls from clients are blocked until the
grace period is over (90 seconds by default).
We want the grace period as low as possible to speed up the tests. '10'
seconds were tested on Fedora 21 and Ubuntu 15.04 as the hosts.
The test image is rebased to Fedora in order to get 'rpc.nfsd -G <n>' option,
Ubuntu does not support it.
