It is easy to switch DirectAdmin server from CentOS 5.x or 6.x to CloudLinux. The process takes a few minutes and replaces just a handful of RPMs. 

• Get <activation_key> either by getting trial subscription or by purchasing subscription
• Download script: centos2cl
• Execute sh centos2cl -k <activation_key>
• Reboot 
  

  # wget http://repo.cloudlinux.com/cloudlinux/sources/cln/centos2cl 
  # sh centos2cl -k <activation_key> 
  # reboot

  Once you have rebooted, you are running CloudLinux kernel with LVE enabled.
• Rebuild apache: 
  

  # yum install liblve-devel
  # cd /usr/local/directadmin/custombuild
  # ./build update
  # ./build set cloudlinux yes
  # ./build apache
  if you run suphp, then run the following additionaly:
  # ./build suphp