我正在尝试在 centos 上安装 redmine，但在 apache 上出现错误。
Redirecting to /bin/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: exit-code) since Mon 2019-06-03 13:16:54 +04; 1min 45s ago
Docs: man:httpd(8)
man:apachectl(8)
Process: 17406 ExecStop=/bin/kill -WINCH ${MAINPID} (code=exited, status=1/FAILURE)
Process: 17404 ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND (code=exited, status=1/FAILURE)
Main PID: 17404 (code=exited, status=1/FAILURE)
Jun 03 13:16:54 localhost httpd[17404]: (98)Address already in use: AH00072: make_sock: could not bind to address [::]:80
Jun 03 13:16:54 localhost httpd[17404]: (98)Address already in use: AH00072: make_sock: could not bind to address 0.0.0.0:80
Jun 03 13:16:54 localhost httpd[17404]: no listening sockets available, shutting down
Jun 03 13:16:54 localhost httpd[17404]: AH00015: Unable to open logs
Jun 03 13:16:54 localhost systemd[1]: httpd.service: main process exited, code=exited, status=1/FAILURE
Jun 03 13:16:54 localhost kill[17406]: kill: cannot find process ""
Jun 03 13:16:54 localhost systemd[1]: httpd.service: control process exited, code=exited status=1
Jun 03 13:16:54 localhost systemd[1]: Failed to start The Apache HTTP Server.
Jun 03 13:16:54 localhost systemd[1]: Unit httpd.service entered failed state.
Jun 03 13:16:54 localhost systemd[1]: httpd.service failed.