title: how to build singularity container from dockerfile
body: <p>I want to build singularity container from dockerfile.</p>
  
  <p>I have pulled and run docker images from docker hub with singularity.</p>
  
  <pre><code>singularity pull docker://ubuntu:latest
  </code></pre>
  
  <p>I  have also build the image from singularity recipe file. </p>
  
  <pre><code>singularity build  cpp.sif singularity_file
  </code></pre>
  
  <p>But I want to build singularity image from dockerfile.</p>
  
  <p>Anyone know how to do it. Is it possible ???</p>