Create a Package repo

1. create /var/pxe/centos6 directory

mkdir -p /var/pxe/centos6

2. mount iso and copy all files into /var/pxe/centos6 and create repo

cp -ivr /media/CentOS_6.3_Final/* /var/pxe/centos6
cd /var/pxe/centos6
createrepo .

3. create conf file /etc/httpd/conf.d/pxeboot.conf

Alias /centos6 /var/pxe/centos6
<Directory /var/pxe/centos6>
  Options Indexes FollowSymLinks
  AllowOverride None
</Directory>

4. Allow selinux httpd_sys_content_t

cd /var/pxe
chcon -R -t httpd_sys_content_t './centos6'

5. Restart httpd

service httpd restart

6. Open browser to check "http://127.0.0.1/centos6" is available Reference:
http://practical-tech.blogspot.tw/2011/10/how-to-configure-pxe-server-in-rhel-6.html
http://httpd.apache.org/docs/current/sections.html