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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<title>Share data between guest and host — An Open Virtual Machine for Cross-Platform Weather Radar Science</title>
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<div class="section" id="share-data-between-guest-and-host">
<h1>Share data between guest and host<a class="headerlink" href="#share-data-between-guest-and-host" title="Permalink to this headline">¶</a></h1>
<div class="section" id="why-are-shared-directories-useful">
<h2>Why are shared directories useful?<a class="headerlink" href="#why-are-shared-directories-useful" title="Permalink to this headline">¶</a></h2>
<p>A useful feature of the virtual machine (VM) concept is that you can
share data between the host (your physical machine) and the guest
(the VM). This way, you can use the software tools
available on the VM for processing (radar) data that
actually resides on your host machine.</p>
</div>
<div class="section" id="how-to-create-a-shared-directory">
<h2>How to create a shared directory?<a class="headerlink" href="#how-to-create-a-shared-directory" title="Permalink to this headline">¶</a></h2>
<p>The procedure of sharing a host directory with the VM
contains two steps.</p>
<div class="section" id="step-1-define-shared-directory">
<span id="ref-step1"></span><h3>Step 1: Define shared directory<a class="headerlink" href="#step-1-define-shared-directory" title="Permalink to this headline">¶</a></h3>
<p>First, you need to define the shared directory, and the name under
which it should be known to the VM. You can do this using the
VirtualBox GUI.</p>
<ul class="simple">
<li>Power-off the VM</li>
<li>In VirtualBox, right-click the VM, and select <code class="docutils literal notranslate"><span class="pre">Settings</span></code></li>
<li>Select the <code class="docutils literal notranslate"><span class="pre">Shared</span> <span class="pre">Folders</span></code> item, hit the <code class="docutils literal notranslate"><span class="pre">Add</span> <span class="pre">folder</span></code> icon</li>
<li>Select the directory you want to share</li>
<li>Under <code class="docutils literal notranslate"><span class="pre">Folder</span> <span class="pre">Name</span></code>, the folder will be known to the VM</li>
<li>Use the check boxes to decide whether the folder should be
<code class="docutils literal notranslate"><span class="pre">read-only</span></code> from the VM, and whether it should be shared permanently;
generally, you should not check <code class="docutils literal notranslate"><span class="pre">Auto-mount</span></code>.</li>
</ul>
</div>
<div class="section" id="step-2-mount-shared-directory-on-the-vm">
<h3>Step 2: Mount shared directory on the VM<a class="headerlink" href="#step-2-mount-shared-directory-on-the-vm" title="Permalink to this headline">¶</a></h3>
<p>Now start the VM again, log in, and execute:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ sudo mount -t vboxsf -o uid=$UID,gid=$(id -g) sharedir mountdir
</pre></div>
</div>
<p>where <code class="docutils literal notranslate"><span class="pre">sharedir</span></code> has to be what you chose as <code class="docutils literal notranslate"><span class="pre">Folder</span> <span class="pre">Name</span></code> above, and
and <code class="docutils literal notranslate"><span class="pre">mountdir</span></code> is the target directory in the VM’s file system which
must already exist (otherwise, you ned to create it using <code class="docutils literal notranslate"><span class="pre">mkdir</span></code>).</p>
<p>For example, if your <code class="docutils literal notranslate"><span class="pre">Folder</span> <span class="pre">Name</span></code> from <a class="reference internal" href="#step-1-define-shared-directory">Step 1: Define shared directory</a> was <code class="docutils literal notranslate"><span class="pre">data2vm</span></code>, you could
execute the following on the VM (assume you are in the <code class="docutils literal notranslate"><span class="pre">~</span></code> directory):</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>~$ mkdir from_host
~$ sudo mount -t vboxsf -o uid=$UID,gid=$(id -g) data2vm ~/from_host
~$ ls from_host
</pre></div>
</div>
<p>The final line is just to verify that the mount was successful, and should
show you the content of your shared directory on the host.</p>
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<li class="toctree-l1"><a class="reference internal" href="build.html">Build the VM from source</a></li>
<li class="toctree-l1 current"><a class="current reference internal" href="#">Share data between guest and host</a></li>
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