解决[warn] _default_ VirtualHost overlap on port 80

错误:

[warn] _default_ VirtualHost overlap on port 80, the first has precedence

这个,大概意思就是后面新增加的这个VirtualHost 由于端口被占用,不能生效,沿用第一个虚拟主机的配置.
检查了一下,发现,原来在httpd.conf里,我没有把#NameVirtualHost *:80前的注释去掉,导致这个没有生效.
去掉#之后:

$ /usr/local/apache/bin/httpd -k restart