How do I reinstall the HTTPD?

Question

I have a problem with my server CentOs7. I installed httpd, it works fine, but I reinstalled for some reason, but after that it never works and throws error. Is there any way I can remove all httpd files?

I tried removing /usr/lib/systemd/system/httpd.service and /usr/sbin/httpd and /etc/httpd, but then when I removed httpd and httpd-tools it throws error again:

Job for httpd.service failed. See "systemctl status httpd.service" and "journalctl -xe" for details.

systemctl status httpd.service:

● httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled; vendor preset: disabled)
   Active: failed (Result: protocol) since Tue 2021-02-23 04:13:01 EST; 21s ago
     Docs: man:httpd(8)
           man:apachectl(8)
  Process: 5396 ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND (code=exited, status=0/SUCCESS)
 Main PID: 5396 (code=exited, status=0/SUCCESS)

Feb 23 04:13:01 localhost.localdomain systemd[1]: Starting The Apache HTTP Server...
Feb 23 04:13:01 localhost.localdomain httpd[5396]: AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using localhost.localdomain. Set the 'ServerName' directive globally to suppress this message
Feb 23 04:13:01 localhost.localdomain httpd[5396]: httpd (pid 3043) already running
Feb 23 04:13:01 localhost.localdomain systemd[1]: Failed to start The Apache HTTP Server.
Feb 23 04:13:01 localhost.localdomain systemd[1]: Unit httpd.service entered failed state.
Feb 23 04:13:01 localhost.localdomain systemd[1]: httpd.service failed.

Answer 1

Why are you manually removing the service files instead of simply launching yum remove httpd?

Have you tried at all to remove the service via yum and then reinstall it again with yum install httpd? What's the output?

The error reports that the service is already running: httpd (pid 3043) already running

What's the result of ps -aux | less?