How to install OpenVPN on a Debian/Ubuntu VPS instantly

This is a follow up post to How to setup a VPN server on a CentOS VPS instantly same requirements and instructions apply.

Minor distribution specific changes were made on the previous CentOS script to get it working under Debian and Ubuntu. We might create one single script which will install OpenVPN on most distributions and architectures in future.

To install issue the following commands logged in as root on your VPS (Refer to this post if you are facing any issues)

wget http://vpsnoc.com/scripts/debian-openvpn.sh

chmod +x debian-openvpn.sh

./debian-openvpn.sh

For any other issues and feedback please e-mail us at support@vpsnoc.com

You may use and modify this script however you see fit, provided that you do not edit the original copyright.

#!/bin/bash
# Quick and dirty OpenVPN install script
# Tested on debian 5.0 32bit, openvz minimal debian OS template
# and Ubuntu 9.04 32 bit minimal, should work on 64bit images as well
# Please submit feedback and questions at support@vpsnoc.com

# John Malkowski vpsnoc.com 01/18/2010

ip=`grep address /etc/network/interfaces | grep -v 127.0.0.1  | awk '{print $2}'`
apt-get update
apt-get install openvpn libssl-dev  openssl
cd /etc/openvpn/
cp -R /usr/share/doc/openvpn/examples/easy-rsa/ /etc/openvpn/
cd /etc/openvpn/easy-rsa/2.0/
chmod +rwx *
. ./vars
./clean-all
source ./vars

echo -e "nnnnnnn" | ./build-ca
clear
echo "####################################"
echo "Feel free to accept default values"
echo "Wouldn't recommend setting a password here"
echo "Then you'd have to type in the password each time openVPN starts/restarts"
echo "####################################"
./build-key-server server
./build-dh
cp keys/{ca.crt,ca.key,server.crt,server.key,dh1024.pem} /etc/openvpn/
clear
echo "####################################"
echo "Feel free to accept default values"
echo "This is your client key, you may set a password here but it's not required"
echo "####################################"
./build-key client1
cd keys/

client="
client
remote $ip 1194
dev tun
comp-lzo
ca ca.crt
cert client1.crt
key client1.key
route-delay 2
route-method exe
redirect-gateway def1
dhcp-option DNS 10.8.0.1
verb 3"

echo "$client" > $HOSTNAME.ovpn

tar czf keys.tgz ca.crt ca.key client1.crt client1.csr client1.key $HOSTNAME.ovpn
mv keys.tgz /root
opvpn='
dev tun
server 10.8.0.0 255.255.255.0
ifconfig-pool-persist ipp.txt
ca ca.crt
cert server.crt
key server.key
dh dh1024.pem
push "route 10.8.0.0 255.255.255.0"
push "redirect-gateway"
comp-lzo
keepalive 10 60
ping-timer-rem
persist-tun
persist-key
group daemon
daemon'

echo "$opvpn" > /etc/openvpn/openvpn.conf

echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o venet0 -j MASQUERADE
iptables-save > /etc/iptables.conf
echo "#!/bin/sh" > /etc/network/if-up.d/iptables
echo "iptables-restore < /etc/iptables.conf" >> /etc/network/if-up.d/iptables
chmod +x /etc/network/if-up.d/iptables
echo "net.ipv4.ip_forward=1" >> /etc/sysctl.conf

/etc/init.d/openvpn start
clear

echo "OpenVPN has been installed
Download /root/keys.tgz using winscp or other sftp/scp client such as filezilla
Create a directory named vpn at C:Program FilesOpenVPNconfig and untar the content of keys.tgz there
Start openvpn-gui, right click the tray icon go to vpn and click connect
For support/bug reports email us at support@vpsnoc.com"