Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ServerName

启动 Apache 经常出现警告
Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ServerName

使用 hostname 设置主机名，仅当前会话中有效：
sudo hostname yourhostname
想永久生效修改这个：
sudo gedit /etc/hostname

或者
在 httpd.conf 中加入 ServerName 指令
ServerName 127.0.0.1

参阅：http://httpd.apache.org/docs/2.2/mod/core.html#servername