Job for httpd.service failed because the control process exited with error code. See "systemctl status httpd.service" and "journalctl -xe" for details.

这个错误提示表明httpd服务控制进程退出时发生了错误，可以通过以下步骤查看详细信息：

1. 运行命令`systemctl status httpd.service`，查看httpd服务的状态信息和错误提示，例如：

$ 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 Wed 2021-08-18 09:30:43 CST; 1min 30s ago
     Docs: man:httpd.service(8)
  Process: 1234 ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND (code=exited, status=1/FAILURE)

Aug 18 09:30:43 example.com systemd[1]: Starting The Apache HTTP Server...
Aug 18 09:30:43 example.com httpd[1234]: AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 192.168.0.1. Set the 'ServerName' directive globally to suppress this message
Aug 18 09:30:43 example.com systemd[1]: httpd.service: control process exited, code=exited status=1
Aug 18 09:30:43 example.com systemd[1]: Failed to start The Apache HTTP Server.
Aug 18 09:30:43 example.com systemd[1]: Unit httpd.service entered failed state.
Aug 18 09:30:43 example.com systemd[1]: httpd.service failed.

2. 运行命令`journalctl -xe`，查看系统日志中与httpd服务相关的错误信息，例如：

$ journalctl -xe

...

Aug 18 09:30:43 example.com httpd[1234]: (98)Address already in use: AH00072: make_sock: could not bind to address [::]:80
Aug 18 09:30:43 example.com httpd[1234]: (98)Address already in use: AH00072: make_sock: could not bind to address 0.0.0.0:80
Aug 18 09:30:43 example.com httpd[1234]: no listening sockets available, shutting down
Aug 18 09:30:43 example.com httpd[1234]: AH00015: Unable to open logs
Aug 18 09:30:43 example.com systemd[1]: httpd.service: control process exited, code=exited status=1
Aug 18 09:30:43 example.com systemd[1]: Failed to start The Apache HTTP Server.

根据上面的错误提示，可以看到httpd服务无法绑定到端口80，可能是因为该端口已被其他服务占用。解决方法是找到并停止占用端口80的服务，或者修改httpd配置文件中监听的端口号。