[root@centos ~]# vi /etc/httpd/conf.d/virtual.conf
↓下記を記入
<VirtualHost *:80>
    ServerName any
    DocumentRoot /tmp
</VirtualHost>
<VirtualHost *:80>
    ServerName server-manual.com
    DocumentRoot /var/www/html
</VirtualHost>
<VirtualHost *:80>
    ServerName virtual.server-manual.com
    DocumentRoot /var/www/virtual
    ErrorLog /var/log/httpd/virtual-error_log
    CustomLog /var/log/httpd/virtual-access_log combined env=!nolog
</VirtualHost>
 
[root@centos ~]# mkdir /var/www/virtual
[root@centos ~]# systemctl reload httpd