apache2.4 與 apache2.2 的虛擬主機配置寫法有所不同
apache2.2的寫法：

<VirtualHost *:80>
    ServerName domain.com
    DocumentRoot "/home/www"
    DirectoryIndex index.html index.php
    <Directory "/home/www">
        Options -Indexes +FollowSymlinks
        AllowOverride All
        Order deny,allow
        Allow from all
    </Directory
 
>
</VirtualHost>

如果在2.4中使用以上寫法就會出現apache AH01630: client denied by server configuration異常。
apache2.4中的寫法為

<VirtualHost *:80>
    ServerName domain.com
    DocumentRoot "/home/www"
    DirectoryIndex index.html index.php

    <Directory "/home/www">
        Options -Indexes +FollowSymlinks
        AllowOverride All
 

        Require all granted
    </Directory>
</VirtualHost>

解決方法，apache2.4中需要將

    Order deny,allow  
    Allow from all  
    Allow from host ip

改為

    Require all granted  
    Require host ip

注：yum安裝的httpd，在/etc/httpd/conf.d/目錄下新增vhosts.conf後重啟即可。