进入到Apache的配置文件：cd /etc/httpd/conf/http.conf
在后面添加：
<VirtualHost *:80>
# This first-listed virtual host is also the default for *:80
ServerName www.example.com
ServerAlias example.com
DocumentRoot "/var/www/html/"
</VirtualHost>
详细参考官网：http://httpd.apache.org/docs/2.4/vhosts/name-based.html
原文：https://www.cnblogs.com/wanyong-wy/p/9257787.html