:: What is DirectAdmin
DirectAdmin is a graphical web-based web hosting control panel designed to make administration of websites easier. – wikipedia
 
:: DA License
Make sure you have DA License before installing DirectAdmin

 
:: How to install DirectAdmin on Linux CentOS
+ installing dependency for DA

yum install gcc gcc-c++ flex bison make bind bind-libs bind-utils openssl openssl-devel perl quota libaio libcom_err-devel libcurl-dev

+ installing DA

wget //www.directadmin.com/setup.sh
chmod 755 setup.sh
./setup.sh

 
:: Testing
Open DA using your web browser on :

//youripaddress:2222

 
:: Link
+ Google
+ DirectAdmin