sudo yum install epel-release
sudo yum -y update
sudo reboot

wget https://raw.githubusercontent.com/hwdsl2/setup-ipsec-vpn/master/vpnsetup_centos.sh -O vpnsetup.sh
sudo sh vpnsetup.sh

YOUR_IPSEC_PSK=''
YOUR_USERNAME=''
YOUR_PASSWORD=''

he ipsec service is currently disabled. To enable this service issue:
 systemctl enable ipsec.service
**********************************************************************
../../OBJ.linux.x86_64/testing/enumcheck/enumcheck -> /usr/local/libexec/ipsec/enumcheck

## Creating VPN configuration..
## Updating sysctl settings..
## Updating IPTables rules...
## Enabling services on boot...
## Starting services...
================================================

IPsec VPN server is now ready for use!

Connect to your new VPN with these details:

Server IP: 159.88.127.33
IPsec PSK: EvA6M5wDZw4kbgL8
Username: vpnuser
Password: TNotmZ7EmGyRa2CY

Write these down. You'll need them to connect!