title: How to get container id of a docker service
body: <p>I want to get a container ID of docker service.
  Is there any command available for this ?</p>
  
  <p>I tried </p>
  
  <pre><code>docker service ps MyService
  </code></pre>
  
  <p>but this one only gives the service ID, I am interested in the container id in which the service is running</p>