启动apache提示 ：
apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ServerName
... waiting apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ServerName
(1)、进入apache的安装目录: cd /etc/apache2/
(2)、编辑http.conf文件，添加ServerName localhost:80
sudo vim httpd.conf
(3)、最后，再次重启apache
sudo /etc/init.d/apache2 restart
