[root@instance-1 certs]# service httpd start
Redirecting to /bin/systemctl start httpd.service
Job for httpd.service failed because the control process exited with error code. See "systemctl status httpd.service" and "journalctl -xe" for details.
[root@instance-1 certs]# systemctl status httpd.service
● httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Tue 2020-02-18 19:35:09 UTC; 6s ago
     Docs: man:httpd(8)
           man:apachectl(8)
  Process: 4195 ExecStop=/bin/kill -WINCH ${MAINPID} (code=exited, status=1/FAILURE)
  Process: 11686 ExecReload=/usr/sbin/httpd $OPTIONS -k graceful (code=exited, status=0/SUCCESS)
  Process: 4194 ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND (code=exited, status=1/FAILURE)
 Main PID: 4194 (code=exited, status=1/FAILURE)

Feb 18 19:35:09 instance-1 systemd[1]: Starting The Apache HTTP Server...
Feb 18 19:35:09 instance-1 systemd[1]: httpd.service: main process exited, code=exited, status=1/FAILURE
Feb 18 19:35:09 instance-1 kill[4195]: kill: cannot find process ""
Feb 18 19:35:09 instance-1 systemd[1]: httpd.service: control process exited, code=exited status=1
Feb 18 19:35:09 instance-1 systemd[1]: Failed to start The Apache HTTP Server.
Feb 18 19:35:09 instance-1 systemd[1]: Unit httpd.service entered failed state.
Feb 18 19:35:09 instance-1 systemd[1]: httpd.service failed.
[root@instance-1 certs]#