Ubuntu14.04启动Apache2报错AH00558问题解决办法

在Ubuntu14.04启动Apache时出现了，如下错误。

# service apache2 reload
 * Restarting web server apache2                                                                                  
AH00557: apache2: apr_sockaddr_info_get() failed for zabbix.cc
AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1. Set the 'ServerName' directive globally to suppress this message
                                                                                                            [ OK ]
# vi /etc/apache2/conf-available/servername.conf
ServerName localhost

# a2enconf servername
Enabling conf servername.
To activate the new configuration, you need to run:
  service apache2 reload

再次重启Apache2，不提示错误了。

# service apache2 restart
 * Restarting web server apache2                                                                            [ OK ]

当没有指定ServerName时，Apache会尝试通过IP地址解析ServerName导致的。