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.
Change `chmod +X` to `chmod +x`, since `+X` does not take affect when there is no execute permission bit already set (either user, group or other).
```console
# ls -l /usr/bin/kubectl
-rw-r--r-- 1 root root 14190181 Aug 10 16:16 /usr/bin/kubectl
# chmod +X /usr/bin/kubectl
# ls -l /usr/bin/kubectl
-rw-r--r-- 1 root root 14190181 Aug 10 16:16 /usr/bin/kubectl
```
Please refer to [chmod](https://en.wikipedia.org/wiki/Chmod "chmod") for more details.
>which is not a permission in itself but rather can be used instead of x. It applies execute permissions to directories regardless of their current permissions and **applies execute permissions to a file which already has at least one execute permission bit already set (either user, group or other)**. It is only really useful when used with '+' and usually in combination with the -R option for giving group or other access to a big directory tree without setting execute permission on normal files (such as text files), which would normally happen if you just used "chmod -R a+rx .", whereas with 'X' you can do "chmod -R a+rX ." instead
The GCE PD plugin uses safe_format_and_mount found on standard GCE images:
https://github.com/GoogleCloudPlatform/compute-image-packages/blob/master/google-startup-scripts/usr/share/google/safe_format_and_mount
On custom images where this is not available pods fail to format and
mount GCE PDs. This patch uses linux utilities in a similar way to the
safe_format_and_mount script to format and mount the GCE PD and AWS EBC
devices. That is first attempt a mount. If mount fails try to use file to
investigate the device. If 'file' fails to get any information about
the device and simply returns "data" then assume the device is not
formatted and format it and attempt to mount it again.
Signed-off-by: Sami Wagiaalla <swagiaal@redhat.com>
