Add NFS export/import pod examples.

examples/nfs/exporter/Dockerfile

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+FROM fedora:21
+MAINTAINER Jan Safranek <jsafrane@redhat.com>
+EXPOSE 2049/tcp
+
+RUN yum -y install nfs-utils && yum clean all && run_nfs /usr/local/bin/run_nfs
+
+ENTRYPOINT ["/usr/local/bin/run_nfs"]

examples/nfs/exporter/README.md

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+# NFS-exporter container
+
+Inspired by https://github.com/cpuguy83/docker-nfs-server. Rewritten for
+Fedora.
+
+Serves NFS4 exports, defined on command line. At least one export must be defined!
+
+Usage::
+
+    docker run -d --name nfs --privileged jsafrane/nfsexporter /path/to/share /path/to/share2 ...

examples/nfs/exporter/run_nfs

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+#!/bin/bash
+
+# Copyright 2015 Red Hat Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+function start()
+{
+
+    # prepare /etc/exports
+    seq=0
+    for i in "$@"; do
+        echo "$i *(rw,sync,no_root_squash,insecure,fsid=$seq)" >> /etc/exports
+        seq=$(($seq + 1))
+        echo "Serving $i"
+    done
+
+    # from /lib/systemd/system/proc-fs-nfsd.mount
+    mount -t nfsd nfds /proc/fs/nfsd
+
+    # from /lib/systemd/system/nfs-config.service
+    /usr/lib/systemd/scripts/nfs-utils_env.sh
+
+    # from /lib/systemd/system/nfs-mountd.service
+    . /run/sysconfig/nfs-utils
+    /usr/sbin/rpc.mountd $RPCMOUNTDARGS
+
+    # from /lib/systemd/system/nfs-server.service
+    . /run/sysconfig/nfs-utils
+    /usr/sbin/exportfs -r
+    /usr/sbin/rpc.nfsd -N 2 -N 3 -V 4 -V 4.1 $RPCNFSDARGS
+
+    echo "NFS started"
+}
+
+function stop()
+{
+    echo "Stopping NFS"
+
+    # from /lib/systemd/system/nfs-server.service
+    /usr/sbin/rpc.nfsd 0
+    /usr/sbin/exportfs -au
+    /usr/sbin/exportfs -f
+
+    # from /lib/systemd/system/nfs-mountd.service
+    kill $( pidof rpc.mountd )
+    # from /lib/systemd/system/proc-fs-nfsd.mount
+    umount /proc/fs/nfsd
+
+    echo > /etc/exports
+    exit 0
+}
+
+
+trap stop TERM
+
+start "$@"
+
+# Ugly hack to do nothing and wait for SIGTERM
+while true; do
+    read
+done