您必须为此创建一个conf文件。
您可以使用sh文件自动创建，如下所示

# !/bin/bash

if [ "x${1}" = "x" ]; then
    echo "User is not specified"
    exit 1
fi

if [ "x${2}" = "x" ]; then
    echo "Domain is not specified"
    exit 1
fi

if [ "x${3}" = "x" ]; then
    echo "Domain is not specified"
    exit 1
fi

/bin/echo ${1}${2} | /bin/egrep -q ';|`|\||>'
if [ $? -eq 0 ]; then
    echo "Bad parameter"
    exit 1
fi

/bin/cat > /etc/httpd/vhost.d/${1}.${2}.conf <<EOF
<VirtualHost *:80>
DocumentRoot /home/user/www.${2}/htdocs
ServerName ${1}.${2}
ServerAlias ${3}
ServerAdmin adminemail@example.com
</VirtualHost>

<VirtualHost *:443>
DocumentRoot /home/user/www.${2}/htdocs
ServerName ${1}.${2}
ServerAlias ${3}
ServerAdmin adminemail@example.com
SSLEngine on
SSLCertificateFile /etc/httpd/conf/ssl.crt/example.com.crt
SSLCertificateKeyFile /etc/httpd/conf/ssl.key/example.key
SSLCACertificateFile /etc/httpd/conf/ssl.crt/example.crt
</VirtualHost>

EOF

service httpd restart

echo "Vhost has been added"  

exit 0

指定的路径和电子邮件地址可以根据您的配置进行修改，并使用vhost_gen.sh将其保存在“/usr/local/bin/”中或您喜欢的任何位置。
在cakephp中调用此sh文件

$subdomain_name = 'xyz';
$domain_name = 'domain.com';
$real_domain_name = 'xyz.domain.com';

exec ("/usr/local/bin/vhost_gen.sh ".$subdomain_name." ".
$domain_name." ".$real_domain_name);

$真实的_domain_name是ServerAlias（如果您要将任何实际域作为该子域的别名）。