title: Docker - Restrictions regarding naming container
body: <p><br>
  I have questions regarding restrictions about naming containers.
  I search online and saw different issue and answers.</p>
  
  <ol>
  <li>what is the maximum characters number in naming container?</li>
  <li>which special characters are not allowed in docker container name? (e.g. '*', '$', ',', '_' ...)</li>
  </ol>