Apache 重启时会有报 AH00558

AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this message

解决的问题是：

sudo gedit /etc/apache2/apache2.conf

在文件后面加上:
#Server Name
ServerName 127.0.0.1