setup OpenVPN on CentOS 7

http://vpnpick.com/how-to-setup-openvpn-server-linux-centos-7/

yum install openvpn easy-rsa -y
vi /etc/openvpn/server.conf
dh dh2048.pem
push “redirect-gateway def1 bypass-dhcp”
push “dhcp-option DNS 8.8.8.8”
push “dhcp-option DNS 8.8.4.4”
mkdir -p /etc/openvpn/easy-rsa/keys
cp -rf /usr/share/easy-rsa/2.0/* /etc/openvpn/easy-rsa
cp /etc/openvpn/easy-rsa/openssl-1.0.0.cnf /etc/openvpn/easy-rsa/openssl.cnf
cd /etc/openvpn/easy-rsa
source ./vars
./clean-all
./build-ca
./build-key-server server
./build-dh
cd /etc/openvpn/easy-rsa/keys
cp dh2048.pem ca.crt server.crt server.key /etc/openvpn
cd /etc/openvpn/easy-rsa
./build-key client

iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT
iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE
iptables-save > /etc/network/iptables.up.rules  # varied path

 something like below...
echo " iptables-restore < /etc/network/iptables.up.rules " >> /etc/rc.local
echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.conf