title: Nginx seems to have no idea of "passenger_root" directive despite correct installation steps of passenger
body: <p>I'm using this guide to install passenger with nginx on a CentOS7: <a href="https://www.phusionpassenger.com/library/install/nginx/install/oss/el7/" rel="nofollow noreferrer">https://www.phusionpassenger.com/library/install/nginx/install/oss/el7/</a></p>
  <p>I fail at the end of step 4:</p>
  <pre><code>sudo service nginx restart
  Redirecting to /bin/systemctl restart nginx.service
  Job for nginx.service failed because the control process exited with error code. See &quot;systemctl status nginx.service&quot; and &quot;journalctl -xe&quot; for details.
  </code></pre>
  <p>Further examining of &quot;journalctl -xe&quot; shows this:</p>
  <pre><code>nginx: [emerg] unknown directive &quot;passenger_root&quot; in /etc/nginx/conf.d/passenger.conf:8
  </code></pre>
  <p>I tried to wipe nginx and passenger out and reinstalling them, tried to follow the steps from the beginning... I've got no more ideas. Interesting is though that nginx is being installed from epel, not from passenger repo, but it also seems that the latter has no nginx only passenger.</p>
  <pre><code>yum info nginx
  Geladene Plugins: fastestmirror
  Loading mirror speeds from cached hostfile
   * base: ftp.rz.uni-frankfurt.de
   * epel: mirror.imt-systems.com
   * extras: ftp.plusline.net
   * updates: ftp.plusline.net
  Installierte Pakete
  Name       : nginx
  Architektur : x86_64
  Epoche             :1
  Version    : 1.16.1
  Ausgabe    : 1.el7
  Größe : 1.6 M
  Quelle      : installed
  Aus Quelle  : epel
  </code></pre>
  <p>What's wrong? How can I solve this?</p>