Add NFS export/import pod examples.

examples/nfs/README.md

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+# Example of NFS volume
+
+See [nfs-web-pod.yaml](nfs-web-pod.yaml) for a quick example, how to use NFS volume
+in a pod.
+
+## Complete setup
+
+The example below shows how to export a NFS share from a pod and import it
+into another one.
+
+### NFS server part
+
+Define [NFS server pod](nfs-server-pod.yaml) and
+[NFS service](nfs-server-service.yaml):
+
+    $ kubectl create -f nfs-server-pod.yaml
+    $ kubectl create -f nfs-server-service.yaml
+
+The server exports `/mnt/data` directory as `/` (fsid=0). The directory contains
+dummy `index.html`. Wait until the pod is running!
+
+### NFS client
+
+[WEB server pod](nfs-web-pod.yaml) uses the NFS share exported above as a NFS
+volume and runs simple web server on it. The pod assumes your DNS is configured
+and the NFS service is reachable as `nfs-server.default.kube.local`. Edit the
+yaml file to supply another name or directly its IP address (use
+`kubectl get services` to get it).
+
+Define the pod:
+
+    $ kubectl create -f nfs-web-pod.yaml
+
+Now the pod serves `index.html` from the NFS server:
+
+    $ curl http://<the container IP address>/
+    Hello World!

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

examples/nfs/nfs-data/Dockerfile

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+FROM jsafrane/nfsexporter
+MAINTAINER Jan Safranek <jsafrane@redhat.com>
+ADD index.html /mnt/data/index.html
+
+ENTRYPOINT ["/usr/local/bin/run_nfs", "/mnt/data"]

examples/nfs/nfs-data/README.md

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+# NFS-exporter container with a file
+
+This container exports /mnt/data with index.html in it via NFSv4. Based on
+../exporter.
+
+Available in dockerhub as
+[jsafrane/nfs-data](https://registry.hub.docker.com/u/jsafrane/nfs-data/).

examples/nfs/nfs-data/index.html

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+Hello world!

examples/nfs/nfs-server-pod.yaml

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+apiVersion: v1beta3
+kind: Pod
+metadata:
+  name: nfs-server
+  labels:
+    role: nfs-server
+spec:
+  containers:
+    - name: nfs-server
+      image: jsafrane/nfs-data
+      privileged: true
+      ports:
+        - name: nfs
+          containerPort: 2049
+          protocol: tcp

examples/nfs/nfs-server-service.yaml

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+kind: Service
+apiVersion: v1beta3
+metadata:
+  name: nfs-server
+spec:
+  ports:
+    - port: 2049
+  selector:
+    role: nfs-server

examples/nfs/nfs-web-pod.yaml

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+#
+# This pod imports nfs-server.default.kube.local:/ into /var/www/html
+#
+
+apiVersion: v1beta3
+kind: Pod
+metadata:
+  name: nfs-web
+spec:
+  containers:
+    - name: web
+      image: dockerfile/nginx
+      ports:
+        - name: web
+          containerPort: 80
+          protocol: tcp
+      volumeMounts:
+          # name must match the volume name below
+          - name: nfs
+            mountPath: "/var/www/html"
+  volumes:
+    - name: nfs
+      nfs:
+        # FIXME: use the right hostname
+        server: nfs-server.default.kube.local
+        path: "/"
+        readOnly: false