httpd: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1 for ServerName
解決辦法非常簡單：
[email protected]:/etc/apache2# vi apache2.conf 
# Include the virtual host configurations:
ServerName  localhost:80
Include sites-enabled/
[email protected]:/etc/apache2# service apache2 restart
[ ok ] Restarting web server: apache2 ... waiting ..

#vim /web/apache/conf/httpd.conf (在這裡/web/apahce是我安裝apache的目錄，你預設安裝的話應該是/usr/local/apache2/icons)
找到#ServerName www.example.com:80   把#去掉，再重啟apache即可沒事了。

現象：
bogon:~/webserver/httpd-2.0.59 # /usr/local/apache2/bin/apachectl start
httpd: Could not determine the server's fully qualified domain name, using 127.0.0.1 for ServerName
httpd (pid 20183) already running
這個問題應該是沒有在 /etc/httpd/conf/httpd.conf 中設定 ServerName  

vi /usr/local/apache2/conf/httpd.conf
最簡單的，修改httpd.conf檔案，增加:
ServerName www.example.com:80
我的改為:

ServerName www.example.com:80

再次啟動就正常了!
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apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ServerName
解決方案：
用記事本開啟 httpd.conf
將裡面的 #ServerName localhost:80 註釋去掉即可。
再執行 httpd
然後可以通過瀏覽器訪問 http://localhost:80 ，如果頁面顯示 “It works！” ，即表示apache已安裝並啟動成功。
++++++++++++++++++++++++++++++++++++++++++++
using localhost.localdomain for ServerName  說不能確認伺服器完全確認域名 localhost.localdoman  這個問題怎麼解決
最佳答案： 
vi /etc/httpd/conf/httpd.conf   加入一句  ServerName  localhost:80
解決步驟：
為了解決這個問題，你需要編輯下面這個httpd.conf檔案，開啟它並根據如下操作進行編輯：
[c-sharp] view plaincopy
sudo gedit /etc/apache2/httpd.conf  
預設的httpd.conf是個空檔案，現在向裡面加入如下內容：
[c-sharp] view plaincopy
ServerName localhost  
儲存並退出。
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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
httpd (pid 7907) already running
修改：去掉註釋即可。
# If your host doesn't have a registered DNS name, enter its IP address here.
#
ServerName www.example.com:8080


解決方案：
進入apache的安裝目錄:
Windows : D:\Program Files\Apache Software Foundation\Apache2.2\conf
linux : /usr/local/apache/conf
用記事本開啟httpd.conf
將裡面的#ServerName localhost:80註釋去掉即可。
再執行httpd
然後可以通過瀏覽器訪問http://localhost：80，如果頁面顯示“It works！”，即表示apache已安裝並啟動成功。

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