参考链接: https://www.digitalocean.com/community/tutorials/how-to-set-up-apache-virtual-hosts-on-ubuntu-14-04-lts

假设要将来自xxxx.com 的访问映射到 /var/www/xxxx.com

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cd /etc/apache2/sites-available/
sudo cp 000-default.conf xxxx.com.conf
sudo vi xxxx.com.conf

把 xxxx.com.conf 的相应内容做一些修改，如下

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<VirtualHost *:80>
    ServerAdmin admin@xxxx.com
    ServerName xxxx.com
    ServerAlias www.xxxx.com
    DocumentRoot /var/www/xxxx.com
    ErrorLog ${APACHE_LOG_DIR}/error.log
    CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

继续执行命令

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sudo a2ensite xxxx.com.conf
sudo service apache2 restart