最近有需求在主机的两个端口分别开两个网站，解析两个域名。但是看了网上许多资料，都没有发现一个明确且方便的方法。经过摸索后终于成功，理论上只要你端口够用，你想开几个网页都成。不废话下面直接上教程！！！
首先，准备你的网页根目录文件夹：
/var/www/site1/
/var/www/site2/
……然后，准备好你的端口，这里我用的是8080和8081
接着，打开并编辑 /etc/apache2/ports.conf
# If you just change the port or add more ports here, you will likely also
# have to change the VirtualHost statement in
# /etc/apache2/sites-enabled/000-default.conf
Listen 80
Listen 8080
Listen 8081
<IfModule ssl_module>
Listen 443
</IfModule>
<IfModule mod_gnutls.c>
Listen 443
</IfModule>
Listen 80一行不需要可以删除。
然后，打开并编辑此文件： /etc/apache2/sites-enabled/000-default.conf
加入两个网站的配置，如下：
<VirtualHost *:8080>
# 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 Domain1.com
ServerAdmin webmaster@localhost
DocumentRoot /var/www/site1
<Directory "/var/www/site1">
AllowOverride ALL
</Directory>
# 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>
<VirtualHost *:8081>
# 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 Domain2.com
ServerAdmin webmaster@localhost
DocumentRoot /var/www/site2
<Directory "/var/www/site2">
AllowOverride ALL
</Directory>
# 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>
<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>
需要注意的是， <VirtualHost *:80> 及其内容是默认自带的，如果删除了 ports.conf 中默认自带的 Listen 80，这里也应该删除。
此时，使用命令重启apache2的服务：
sudo service apache2 restart现在输入 ip地址:8080 和 ip地址:8081，就可以访问两个根目录下的网页了。
至于配置文件中ServerName的值，我还没进行域名解析，测试后更新。关于这一点参考https://cloud.tencent.com/developer/article/1544296
另外，这篇博客https://blog.csdn.net/jochen_M/article/details/84073588 提供的方法是先从sites-available文件夹中创建配置文件，再从sites-enabled目录下建立符号链接，这好像是正规做法。还不懂为啥，如果有懂的还烦请赐教！！
5.27 2023备注，通过域名访问失败。
Reference
https://cloud.tencent.com/developer/article/1544296
https://blog.csdn.net/jochen_M/article/details/84073588