How to tag a docker container?
<p>I'm creating an app when I have several kind of containers, and I want to know if docker has some way of tagging <em>containers</em> (example: database, data-only ...).</p>

<p>Note: This <a href="https://stackoverflow.com/questions/27985229/tag-a-docker-container">answer</a> is about giving names to containers instead of tags. <strong>I'm asking to giving arbitrary tags to containers, not images</strong></p>