In debain apt-get install openvpn In Centos yum install openvpn Create Certificate in debain (a) The default directory for easy-rsa certificates is "/usr/share/doc/openvpn/examples/easy-rsa/2.0/". Now copy that directory into /etc/openvpn #cp -R /usr/share/doc/openvpn/examples/easy-rsa/ /etc/openvpn/ # cd /etc/openvpn/2.0/ (b). Now we will create the certificate for CA #. ./vars #./clean-all #./build-ca [...]