GlusterFS by default uses a log file based on the mountpoint path munged into a
file, i.e. `/mnt/foo/bar` becomes `/var/log/glusterfs/mnt-foo-bar.log`.
On certain Kubernetes environments this can result in a log file that exceeds
the 255 character length most filesystems impose on filenames causing the mount
to fail. Instead, use the `log-file` mount option to place the log file under
the kubelet plugin directory with a filename of our choosing keeping it fairly
persistent in the case of troubleshooting.
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