Another alternative, for what it&#x27;s worth: <a href="https:&#x2F;&#x2F;github.com&#x2F;rciorba&#x2F;pidunu" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;rciorba&#x2F;pidunu</a><p>I&#x27;ve created an Ubuntu PPA packaging of it (<a href="https:&#x2F;&#x2F;launchpad.net&#x2F;~danieldent&#x2F;+archive&#x2F;ubuntu&#x2F;pidunu" rel="nofollow">https:&#x2F;&#x2F;launchpad.net&#x2F;~danieldent&#x2F;+archive&#x2F;ubuntu&#x2F;pidunu</a>) and you can see an example of it in use at: <a href="https:&#x2F;&#x2F;github.com&#x2F;DanielDent&#x2F;docker-powerdns" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;DanielDent&#x2F;docker-powerdns</a><p>For situations involving multiple processes, there&#x27;s also <a href="https:&#x2F;&#x2F;github.com&#x2F;just-containers&#x2F;s6-overlay" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;just-containers&#x2F;s6-overlay</a><p>Example use: <a href="https:&#x2F;&#x2F;github.com&#x2F;DanielDent&#x2F;docker-nginx-ssl-proxy" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;DanielDent&#x2F;docker-nginx-ssl-proxy</a> (automated Let&#x27;s Encrypt SSL front-end)