To remove IP address from a OpenVz contain use:

vzctl set <CTID> --ipdel <IP1>

Example:
vzctl set 101 --ipdel 10.0.0.1  --save

Step 1
yum install psmisc net-tools systemd-devel libdb-devel perl-DBI xfsprogs

Step 2
wget http://www.directadmin.com/setup.sh

Set Chmod
chmod 755 setup.sh

Step3 
Execute
./setup.sh