title: Apache won't start in CentOS 7 due to missing SSLCertificateFile
body: <p>Apache does not start after installing the web server. (CentOS 7)</p>
  
  <pre><code>● httpd.service - The Apache HTTP Server
  Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled)
  Active: failed (Result: exit-code) since Sat 2020-03-28 12:18:22 MSK; 16ms ago
  Docs: man:httpd.service(8)
  Process: 30144 ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND (code=exited, status=1/FAILURE)
  Main PID: 30144 (code=exited, status=1/FAILURE)
  Status: "Reading configuration..."
  
  Mar 28 12:18:22 box-40395.localdomain systemd[1]: Starting The Apache HTTP Server...
  Mar 28 12:18:22 box-40395.localdomain httpd[30144]: AH00526: Syntax error on line 103 of /etc/httpd/conf.d/ssl.conf:
  Mar 28 12:18:22 box-40395.localdomain httpd[30144]: SSLCertificateFile: file '/etc/pki/tls/certs/localhost.crt' does not exist or is empty
  Mar 28 12:18:22 box-40395.localdomain systemd[1]: httpd.service: main process exited, code=exited, status=1/FAILURE
  Mar 28 12:18:22 box-40395.localdomain systemd[1]: Failed to start The Apache HTTP Server.
  Mar 28 12:18:22 box-40395.localdomain systemd[1]: Unit httpd.service entered failed state.
  Mar 28 12:18:22 box-40395.localdomain systemd[1]: httpd.service failed.
  </code></pre>