在Debian 8 系统里设置apache web的虚拟主机

云友“ bokie ”提到，不想让他人的域名访问到自己ECS服务器上的站点内容。

因为安装Apache后，在浏览器地址栏里输入ECS的公网地址，访问到的页面是默认站点的内容，如果这时有他人的域名解析到这个公网IP地址，也会访问到相同的内容。

本例环境：Debian 8，通过apt-get安装了apache web，yun.anqun.org 和 portal.anqun.org 两个域名均解析到了ECS的公网IP地址：121.43.110.72

过程：

1. 打开apache的虚拟主机配置文件目录，/etc/apache2/sites-enabled ，里边有一个默认站点的配置文件，000-default.conf，内容如下：
<VirtualHost *:80>
        # The ServerName directive sets the request scheme, hostname and port that
        # the server uses to identify itself. This is used when creating
        # redirection URLs. In the context of virtual hosts, the ServerName
        # specifies what hostname must appear in the request's Host: header to
        # match this virtual host. For the default virtual host (this file) this
        # value is not decisive as it is used as a last resort host regardless.
        # However, you must set it for any further virtual host explicitly.
        #ServerName www.example.com

        ServerAdmin webmaster@localhost
        DocumentRoot /var/www/html

        # Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
        # error, crit, alert, emerg.
        # It is also possible to configure the loglevel for particular
        # modules, e.g.
        #LogLevel info ssl:warn

        ErrorLog ${APACHE_LOG_DIR}/error.log
        CustomLog ${APACHE_LOG_DIR}/access.log combined

        # For most configuration files from conf-available/, which are
        # enabled or disabled at a global level, it is possible to
        # include a line for only one particular virtual host. For example the
        # following line enables the CGI configuration for this host only
        # after it has been globally disabled with "a2disconf".
        #Include conf-available/serve-cgi-bin.conf
</VirtualHost>
其中没有设置ServerName，且提示这个站点将作为默认站点，即如果当请求域名不存在时，将显示该站点的内容。

2. 现在在 /etc/apache2/sites-enabled 目录里，新创建一个虚拟站点 yun.anqun.org 的配置文件 111-yun_anqun_org.conf ，简化后的内容如下：
<VirtualHost *:80>
        ServerName yun.anqun.org
        DocumentRoot /var/www/html/yun.anqun.org
</VirtualHost>
3. 保存后重启apache2服务，在浏览器里分别访问 http://yun.anqun.org/ , http://portal.anqun.org/, http://121.43.110.72/ ，结果显示，后两个网址访问到的都是默认站点的内容
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所以，如果想不让他人的域名访问到自己的站点内容，可将默认站点设置为其它内容（或空白）即可。