How To Install OpenVPN Server on CenOS

First of all we have to check wheter TUN device enabled
[root@gilby ~]# cat /dev/net/tun
cat: /dev/net/tun: File descriptor in bad state

The reply shows that TUN device is enabled

Next we have to install needed applications. Type this command
yum install gcc rpm-build autoconf.noarch zlib-devel pam-devel openssl-devel make

After installin that packages now we have to download the Openvpn package. Type this command
wget http://openvpn.net/release/openvpn-2.0.9.tar.gz



Then Type this command
wget http://openvpn.net/release/lzo-1.08-4.rf.src.rpm

And we have to build that packages. So Type this command
rpmbuild --rebuild lzo-1.08-4.rf.src.rpm
then type this
rpm -Uvh /usr/src/redhat/RPMS/i386/lzo-*.rpm
then type this
rpmbuild -tb openvpn-2.0.9.tar.gz
And then type this
rpmbuild -tb openvpn-2.0.9.tar.gz


Now We Have OpenVPN installed on Our Server :D
What to do next is copying All configuration files into /etc/openvpn  folder. Then we must type this command
cp -r /usr/share/doc/openvpn-2.0.9/easy-rsa/ /etc/openvpn/

The Next Step is Creating Certificates
cd /etc/openvpn/easy-rsa/2.0
source ./vars
./vars
./clean-all
./build-ca



./build-key-server server
./build-dh

Then we have to copy that Certificates. So Type this command
cp /etc/openvpn/easy-rsa/2.0/keys /etc/openvpn/keys -R