1，你重启apache2是报错如下：
* Restarting web server apache2 apache2: Could not reliably determine the server's fully qualified domain name, using 192.168.11.18 for ServerName
... waiting apache2: Could not reliably determine the server's fully qualified domain name, using 192.168.11.18 for ServerName
解决方法：
- sudo gedit /etc/apache2/httpd.conf
- 默认的httpd.conf是个空文件，现在向里面加入如下内容：ServerName localhost
- sudo /etc/init.d/apache2 restart或者 sudo service apache2 restart