Implemented export data faq on Central VM.

central_service/app/frontend/app/templates/components/faqs/lambda-application/index-component.hbs

@@ -136,13 +136,13 @@
       <div class="box-header with-border">
         <h3 class="box-title">
           <span class="label label-warning"><i class="fa fa-th"></i></span>               
-          How to export your data</h3>
+          How to export my immutable data</h3>
         </div><!-- /.box-header -->
         <div class="box-body">
          <div class="row">
           <div class="col-md-12"> 
             <!-- Conversations are loaded here -->
-            Follow the steps described in this section to export your data.
+            Follow the steps described in this section to export your immutable data.
           </div><!--col-->
         </div><!--row-->
         <div class="row">

central_service/app/frontend/app/templates/faqs/lambda-application/export-data.hbs

+<section class="content">
+  <div class="row">
+   <div class="col-xs-12">
+    <div class="box box-primary">
+      <div class="box-header with-border">
+        <h3 class="box-title">How to export my immutable data</h3>
+        <div class="box-tools pull-right">
+          <button class="btn btn-box-tool" data-widget="collapse"><i class="fa fa-minus"></i></button>
+          <button class="btn btn-box-tool" data-widget="remove"><i class="fa fa-times"></i></button>
+        </div>
+      </div><!-- /.box-header -->
+      <div class="box-body no-padding">
+        <div class="row">
+          <div class="col-md-12">
+            <div class="pad"> Follow the steps described in this section to export your immutable data.
+            </div>
+          </div><!-- /.col -->
+
+        </div><!-- /.row -->
+      </div><!-- /.box-body -->
+    </div><!--box box-primary-->
+  </div><!--col-xs-12-->
+</div><!--row -->
+
+
+<div class="row">
+  <div class="col-xs-12">
+    <!-- DIRECT CHAT DANGER -->
+    <div class="box box-success ">
+      <div class="box-header with-border">
+        <h3 class="box-title">Short guide on how to export the immutable data from a Lambda Instance</h3>
+      </div><!-- /.box-header -->
+      <div class="box-body">
+        <div class="row">
+          <div class="col-md-12">
+            <h1>Export Immutable Data</h1>
+
+            <p>
+              <!-- TODO Explain with pictures where to find the hostname of the Master Node -->
+              The immutable data of each Lambda Instance, are saved on its <a href="https://hadoop.apache.org">Hadoop Distributed File System(HDFS)</a>.
+              In order to export them, you will have to connect over ssh on the Master Node of your Lambda Instance and create a snapshot of the HDFS. After
+              that, you can move the snapshot on the file system of your VM and then, secure copy it on your local machine, upload it on the cloud etc...
+            </p>
+
+            <p>
+              The step-by-step directives your should execute are the following:
+
+              <ol>
+                <li>
+                  Connect over ssh on the Master Node of your Lambda Instance:
+                  <pre>
+ssh -l root snf-XXXXXX.vm.okeanos.grnet.gr
+                  </pre>
+                  where, XXXXXX should be replaced with the id of the VM(e.g. snf-543786.vm.okeanos.grnet.gr)
+                </li><br>
+
+                <li>
+                  Allow snapshots for the root directory of the HDFS:
+                  <pre>
+/usr/local/hadoop/bin/hdfs dfsadmin -allowSnapshot /
+                  </pre>
+                  Note that you can choose to snapshot any other directory, not only the root. To do that, supplement the "/" symbol of the directive with the
+                  path of the directory you want to allow snapshots. For example, if you choose the directory "/flume/input", you should execute the directive:<br>
+                  <pre>
+/usr/local/hadoop/bin/hdfs dfsadmin -allowSnapshot /flume/input
+                  </pre>
+                </li><br>
+
+                <li>
+                  Create the SnapShot:
+                  <pre>
+/usr/local/hadoop/bin/hdfs dfs -createSnapshot / s0
+                  </pre>
+                  As stated on the previous step, you can choose to SnapShot a different directory. The full path of the directory you choose, should replace the "/"
+                  argument of the directive. This command will create a directory "/.snapshot/s0". Note that, "s0" is the name of the directory that is created.
+                  You can replace this on the directive with any name of your choice.
+                </li><br>
+
+                <li>
+                  Copy the SnapShot from HDFS to VM file system:
+                  <pre>
+/usr/local/hadoop/bin/hdfs dfs -get /.snapshot/s0
+                  </pre>
+                </li><br>
+
+                <li>
+                  Copy the snapshot on the local file system of your Laptop:
+                  <pre>
+scp -r root@snf-XXXXXX.vm.okeanos.grnet.gr:/root/s0 .
+                  </pre>
+                  In the above directive, you should again replace the XXXXXX with the id of your VM. Also, the path "/root/s0" indicates the place of the SnapShot directory on the
+                  VM and "." indicates the place where the SnapShot will be copied on your Laptop. You can change these paths to fit your needs.
+                </li>
+              </ol>
+            </p>
+          </div><!--col-->
+        </div><!--row-->
+      </div><!--class="box-body"-->
+    </div> <!--box-->
+  </div><!--col-md-3 -->
+</div>  <!--row-->
+</section><!-- /.content -->