如果採用RPM套件安裝，安裝路徑應在 /etc/httpd目錄下。
（學習教學建議：apache）
apache設定檔：/etc/httpd/conf/httpd.conf 可以修改相關的存取路徑及設定
Apache模組路徑：/usr/sbin/apachectl 啟動模組
web目錄：/var/www/html 專案的儲存路徑
如果採用原始程式碼安裝，一般預設安裝在/usr/local/apache2目錄下。
啟動apache報錯訊息，很大程度要檢查是不是連接埠被佔用了，因為預設apache啟動的是80埠。像nginx預設頁是開啟80埠。
報錯訊息如下：
[root@localhost ~]# service httpd restart
Redirecting to /bin/systemctl restart 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@localhost ~]# service httpd status
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 三 2018-12-05 14:42:42 CST; 11s ago
Docs: man:httpd(8)
man:apachectl(8)
Process: 3640 ExecStop=/bin/kill -WINCH ${MAINPID} (code=exited, status=1/FAILURE)
Process: 3639 ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND (code=exited, status=1/FAILURE)
Main PID: 3639 (code=exited, status=1/FAILURE)
12月 05 14:42:42 localhost.localdomain httpd[3639]: (98)Address already in use: AH00072: make_sock: could not bind to address [::]:80
12月 05 14:42:42 localhost.localdomain httpd[3639]: (98)Address already in use: AH00072: make_sock: could not bind to address 0.0.0.0:80
12月 05 14:42:42 localhost.localdomain httpd[3639]: no listening sockets available, shutting down
12月 05 14:42:42 localhost.localdomain httpd[3639]: AH00015: Unable to open logs
12月 05 14:42:42 localhost.localdomain systemd[1]: httpd.service: main process exited, code=exited, status=1/FAILURE
12月 05 14:42:42 localhost.localdomain kill[3640]: kill: cannot find process ""
12月 05 14:42:42 localhost.localdomain systemd[1]: httpd.service: control process exited, code=exited status=1
12月 05 14:42:42 localhost.localdomain systemd[1]: Failed to start The Apache HTTP Server.
12月 05 14:42:42 localhost.localdomain systemd[1]: Unit httpd.service entered failed state.
12月 05 14:42:42 localhost.localdomain systemd[1]: httpd.service failed.
[root@localhost ~]#可以看到Address already in use錯誤，修改apache的連接埠。
編輯/etc/httpd/conf/httpd.conf
#再重新啟動即可。
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