Unable to setup certbot properly with nginx + rails

According to the article

I’m running command to test it:

    $ sudo certbot renew --dry-run  

And get this:

      WARNING:certbot.renewal:Attempting to renew cert from /etc/letsencrypt/renewal/ produced an unexpected error: At least one of the (possibly) required ports is already taken.. Skipping.
      ** DRY RUN: simulating 'certbot renew' close to cert expiry
      **          (The test certificates below have not been saved.)

      All renewal attempts failed. The following certs could not be renewed:
        /etc/letsencrypt/live/ (failure)
      ** DRY RUN: simulating 'certbot renew' close to cert expiry
      **          (The test certificates above have not been saved.)

It’s because nginx is running. But: how is it supposted to work? Stopping nginx and my website twice a day to check and possibly renew a certificate won’t be a wise way to go

How to fix it?

I’m using nginx + rails.

In cron I have this job:

    $ sudo certbot renew 

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You shouldn’t need to restart nginx, a reload should be enough. Check --help to see if your certbot has support for --post-hook "service nginx reload"

I believe newer nginx version will reload certificates as part of their reload - and if they don’t --post-hook should only result in one nginx restart every 3 months.