Debian下/etc/apache2/sites-enabled/000-default.conf的问题

这个文件之所以命名成000-default.conf，而不是直接命名成default.conf是有原因的。
原因大概就是Apache在启动的时候会先加载这个文件里的配置作为default配置。
这是我刚刚摸索出来的。

例如，这是一个在80端口配置虚拟主机的写法(默认的/etc/apache2/sites-enabled/000-default.conf文件内容)：

	# 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

如果此时有另外一个虚拟主机配置文件像这样写，并且命名成000-a.conf:

	ServerName www.example.com
	ServerAdmin webmaster@localhost
	DocumentRoot /var/www/example.com
	ErrorLog ${APACHE_LOG_DIR}/example.com.error.log
	CustomLog ${APACHE_LOG_DIR}/example.com.access.log combined

假设你的虚拟主机IP是1.2.3.4，此时启动apache2，以IP+端口的形式来访问这个站点，例如访问http://1.2.3.4:80/
你获取到的将是/var/www/example.com路径下的web文件，而不是默认的/var/www/html
推测是由于Apache先载入了000-a.conf的内容并将它作为了默认配置所导致的。
重命名000-a.conf这个文件，令它的载入顺序在000-default.conf之后，即可避免上述问题。