Centos 7

Install ovpn

a)From epel repository for enterprise linux 7

we need to add epel repository if it was not done before how to use yum

wget --no-check-certificate
rpm -i epel-release-latest-7.noarch.rpm
yum install openvpn
yum install easy-rsa

b)Using package for enterprise linux 7 from

wget --no-check-certificate
rpm -i openvpn-2.3.8-1.el7.x86_64.rpm
yum install easy-rsa

enabling service

ln -s /lib/systemd/system/openvpn\@.service /etc/systemd/system/\@server.service
sytemctl start openvpn@server
sytemctl status openvpn@server
sytemctl stop openvpn@server



apt-get install openvpn
# on the latest debian versions is easy-rsa standalone package
apt-get install easy-rsa

Enabling service startup at boot time

update-rc.d openvpn defaults

Configure clients and server

Setting up server

Generating server and client keys

preparing configs from samples

mkdir -p /etc/openvpn/easy-rsa/keys
## COPY scripts
# old debian systems
cp -rf /usr/share/openvpn/easy-rsa/2.0/* /etc/openvpn/easy-rsa
# OR newer rhel
cp -rf /usr/share/easy-rsa/2.0/* /etc/openvpn/easy-rsa
# OR newer debian
cp -rf /usr/share/easy-rsa/* /etc/openvpn/easy-rsa

cp /usr/share/doc/openvpn-*/sample/sample-config-files/server.conf /etc/openvpn

You can set export KEY_* in this file for not need to enter credentials for each key separately

vim /etc/openvpn/easy-rsa/vars

Sourcing defined values

cd /etc/openvpn/easy-rsa/
source ./vars

generating server ca,keys

cd /etc/openvpn/easy-rsa/
./build-key-server server
cd keys
cp dh2048.pem ca.crt server.crt server.key /etc/openvpn

generating client keys

cd /etc/openvpn/easy-rsa
./build-key client

note:When asked for 'common name' please fill in unique name for client (it will be listed in openvpn.log after login)

cd keys
mkdir client1
cp ca.crt client.key client.crt client1

Configuring options in /etc/openvpn/server.conf

You need at least to configure following options:

port 1194
proto udp
dev tun
ca ca.crt
cert server.crt
key server.key  # This file should be kept secret
dh dh2048.pem
ifconfig-pool-persist ipp.txt
keepalive 10 120
user nobody
group nobody
status openvpn-status.log
verb 4

optional but usefull options

push "route"
push "route"
client-config-dir ccd

example of file ccd/client1 when optional client-config-dir is enabled we suppose that in client's key is its common name defined 'client1'


openvpn server by default push routing for all subnets defined earlier in server.conf(, to all clients, but with this setting it will not push routing for to this client and all packets arriving oVPNserver with destination address in subnet will be redirected to this client. Additional we require that client will use address.

Configuring client.conf

we assume that previously created ca.crt, client.key and client.crt was uploaded to server to /etc/openvpn/key/client1/

dev tun
proto udp
remote here_address_of_a_vpn_server 1194
resolv-retry infinite
ca key/client1/ca.crt
cert key/client1/client.crt
key key/client1/client.key
ns-cert-type server
verb 3


Startup on sysV

vim /etc/default/openvpn


Startup on systemd

in case you have config file stored in /etc/openvpn/1.conf

systemctl enable openvpn@1.service
systemctl start openvpn@1.service