title: Docker php can't run proprerly crontab
body: <p>I run a docker php container to show a website. I'm using the php:5.6-apache image and then in the Dockerfile I put theses lines :</p>
  
  <pre><code># Setup crontab
  ADD ./crontab /etc/cron.d/crontab
  RUN chmod 0644 /etc/cron.d/crontab
  RUN touch /var/log/cron.log
  CMD cron &amp;&amp; tail -f /var/log/cron.log
  </code></pre>
  
  <p>This works very well, if in the crontab file I put a line to put a hello world in a file, then the process works but I can't access anymore to my website.
  If i try to write localhost i get a "can't access to the server error" like there is no server running.</p>
  
  <p>If i comment "CMD cron &amp;&amp; tail -f /var/log/cron.log", then i can now reach the server but the crontab not work anymore...</p>
  
  <p>What can i do ?</p>