title: Reloading a docker container from another container
body: <p>Good day. My task is to raise a container with Certbot, which will re-issue certificates for other containers. After re-issuing certificates, I need to somehow send a signal to other containers to reload them. Can this be done from a Certbot container?
  An approximate algorithm of actions is as follows:</p>
  <ol>
  <li>Raise the Certbot container with the total Volume.</li>
  <li>Raise another container and connect its catalog with certificates to the general Volume.</li>
  <li>Configure certbot to reissue certificates.</li>
  <li>After re-issuing certificates, send a reboot signal from the container with Certbot to another container.</li>
  </ol>
  <p>How can I implement the fourth point?</p>