apache2: Could not reliably determine the server's fully qualified domain name,

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：

    1. sudo gedit /etc/apache2/httpd.conf  
    2. 默认的httpd.conf是个空文件，现在向里面加入如下内容：ServerName localhost  
    3. sudo /etc/init.d/apache2 restart或者  sudo  service apache2 restart
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原文地址：https://www.cnblogs.com/kobigood/p/4318479.html